ES3058593T3 - Circuit breaker - Google Patents

Abstract

A circuit breaker comprising a housing, a phase pole, and a leakage protection pole arranged on opposite sides of the housing. The leakage protection pole comprises a zero-sequence current transformer, a leakage operating mechanism, and a leakage testing mechanism; a main loop of the circuit breaker's phase pole passes through the zero-sequence current transformer; the leakage testing mechanism comprises a spring, a test button, and first and second contacts connected respectively to the two ends of a test loop; one end of the spring has a first contact compatible with either the leakage operating mechanism or the phase pole operating mechanism, and the other end of the spring has a second contact compatible with the test button; the leakage operating mechanism or the phase pole circuit breaker can push the first contact to make contact with the phase pole when the circuit breaker is tripped; the test button can push the second contact to make contact with the phase pole. The test mechanism forms the test loop, which has double breaking points by means of two contacts: the first contact part and the second contact part on the elastic piece. The first and second contact parts are actuated respectively by the leakage operating mechanism and the test button. (Automatic translation using Google Translate, no legal value)

Description

[0001] DESCRIPTION

[0002] Circuit breaker

[0003] Technical field

[0004] The present invention relates to the field of low-voltage equipment and, more specifically, to a circuit breaker. Background of the art

[0005] Since a circuit breaker's test mechanism is limited by the space of its housing, a single-break point structure is typically used in the test mechanism's test loop. However, when the circuit breaker is off, pressing a test button on the test mechanism can cause a ground voltage to appear at one of the circuit breaker's output terminals due to the conduction of the test loop. This poses a risk of electric shock during use and does not comply with safety regulations in certain areas, thus imposing certain limitations. Therefore, some circuit breakers modify the test mechanism's test loop into a dual-break point structure. One of the dual break points is controlled by a handle, and the test loop can only be performed by pressing the test button when the handle is on. However, the conduction and disconnection speeds of the break point are affected by the connection and disconnection speeds of the handle. If the handle is slowly reset, the breaking point will slowly disconnect. If the circuit breaker is reverse-wired at that moment, the test loop may slowly disconnect when the test button is pressed. This can cause a circuit breaker coil to overheat and burn out, leading to circuit breaker failure and severely compromising the breaker's reliability. Brief description of the prior art:

[0006] 1. A leakage circuit breaker is disclosed by PCT application no. WO 2014/167603 A1, comprising a left pole 2, which opens the circuit when the leakage circuit breaker detects a leakage current; the left pole 2 comprises a disconnection mechanism 260, comprising a handle 230, a push rod 263, a connecting rod 264, a movable contact element 270, a transmission element 280, a latching element 300, a zero-sequence current transformer 331, a test device 350, and a phase pole main loop 332, 333 of the circuit breaker passing through the transformer 331; The transmission element 280 and the latch element 300 rotate about the second rotating shaft 265; the transmission element 280 is connected to the movable contact element 270 via a movable shaft 267; a working-side projection 264b of the connecting rod 264 is hinged to the handle 230, and a transmission-side projection 264c of the connecting rod 264 engages with a locking piece 286 of the transmission element 280; a working-side end 263a of the push connecting rod 263 is hinged to the handle 230, and a transmission-side end 263b of the push connecting rod 263 engages with a bent latch piece 313 of the latch element 300 and is arranged between the bent latch piece 313 and a locked projection 284 of the transmission element 280; The latching element 300 is provided with a first push piece 306, which is engaged with a leak-test device 340; the leak-test mechanism 350 comprises a switch spring 354 and a test button 351, a first end 356 of the spring 354 extends into the button 351 and is in drive engagement with the latter, the end 356 is actuated, by the button 351, to make contact with the first conducting rod 352a when the button 351 is pressed down, and a second end 357 of the spring 354 extends into the handle 230 and is positioned between the projection 264b and a spring-positioning portion 264d of the rod 264, and the end 357 is actuated, by the rod 264, to make contact with the second conducting rod 353a when the left pole 2 is connected; The disconnection mechanism 260 and the leakage operating mechanism 22 of this application have different structures.

[0007] 2. A leakage circuit breaker is disclosed by Chinese patent no. CN 206148380U, comprising a handle 4, a movable contact support 5 pivotally mounted on a central partition 2, and a test button assembly 6 comprising a button 61, a conductive torsion spring 62, and a conductive column; there is a latch element and a buckle element pivotally mounted on the support 5 separately, the handle 4 being in drive connection with the support 5; the conductive column comprises a first conductive column 631 used to supply power, a second conductive column 632 connected to the printed circuit board, and a third conductive column 633 connected to the N pole of the test loop; A second extendable arm 622 of spring 62 is actuated to make contact with column 633 when button 61 is pressed, and a first extendable arm 621 of spring 62 is actuated, by an actuating lever 51 of support 5, to make contact with column 631 when the circuit breaker is switched on by turning handle 4.

[0008] Summary of the invention

[0009] The present invention aims to overcome the defects of the prior art, and provides a circuit breaker with a simple structure and high reliability.

[0010] To achieve the above objective, the technical solutions used in the present invention are as follows.

[0011] A circuit breaker includes a housing, and a circuit breaker phase pole and a leakage protection pole arranged on two sides of the housing side by side, wherein the leakage protection pole includes a zero-sequence current transformer, a leakage running mechanism, and a leakage testing mechanism, and a main loop of the circuit breaker phase pole passes through the zero-sequence current transformer; The leakage test mechanism includes an elastic element, a test button, and a first contact element and a second contact element connected respectively to two ends of a test loop. One end of the elastic element is provided with a first contact portion matching the leakage operating mechanism or a phase pole operating mechanism. The other end of the elastic element is provided with a second contact portion matching the test button. The leakage operating mechanism or the phase pole operating mechanism is able to push the first contact portion to make contact with the first contact element when the circuit breaker is connected, and the test button is able to push the second contact portion to make contact with the second contact element.

[0012] According to the present invention, the leakage operating mechanism pushes the first contact portion to make contact with the first contact element when the circuit breaker is connected. The leakage operating mechanism includes a protective lever pivotally installed in the housing, and a protective jump buckle and a protective locking latch pivotally installed on the protective lever respectively and fastened together. The protective jump buckle is hinged to one end of a protective connecting rod, the other end of the protective connecting rod is hinged to a circuit breaker handle. One end of the protective lock is positioned in correspondence with a leakage release. The first contact element is located on one side of the protective lever. The first contact portion of the spring element extends between the protective lever and the first contact element to align with the protective lever, and the spring element actuates the protective lever to rotate more rapidly when released.

[0014] Furthermore, the elastic element is a torsion spring, the elastic element includes a spiral portion connected between the first contact portion and the second contact portion, the spiral portion is installed on a spring shaft of the housing, the first contact portion and the second contact portion are both arranged vertically to an axis of the spiral portion, the first contact portion extends between the guard lever and the first contact element, and the second contact portion extends between the test button and the second contact element.

[0016] Additionally, the first contact element and the second contact element are arranged below the leakage operating mechanism, the first contact element is arranged between the second contact element and the elastic element, the test button is located on one side of the leakage operating mechanism and above the second contact portion, a length of the second contact portion is greater than that of the first contact portion, one end of the second contact portion near the spiral portion coincides with the test button, the other end of the second contact portion passes through one side of the first contact element and extends above the second contact element, and a test resistor connected with the first contact element is arranged below a place between the first contact element and the elastic element.

[0018] Additionally, a rear face of the guard lever is provided with a first thrust projection extending to one side of the first contact portion, a side edge of the guard lever is provided with a second thrust projection extending to a side face, and a thrust step face to limit the first contact portion is formed between the second thrust projection and the first thrust projection.

[0020] According to an improvement of another embodiment of the present invention, the phase pole operating mechanism pushes the first contact portion to make contact with the first contact element when the circuit breaker is connected; the phase pole of the circuit breaker includes the phase pole operating mechanism, and a static contact and a movable contact arranged oppositely, the movable contact being connected to the phase pole operating mechanism; the leakage protection pole includes a neutral pole static contact and a neutral pole movable contact arranged oppositely in the housing, and the phase pole actuating mechanism pushes the first contact portion to make contact with the first contact element through a neutral line actuating element connected to the neutral pole movable contact when the circuit breaker is connected.

[0022] Additionally, the neutral line drive element includes a protective drive rod and a shaft-machine coupling drive rod. One end of the protective drive rod is connected to the movable contact of the neutral pole, and the protective drive rod is articulated to the phase pole operating mechanism via the shaft-machine coupling drive rod. The first contact portion of the elastic element matches the protective drive rod. The protective drive rod pushes the first contact portion to make contact with the first contact element. The movable contact of the neutral pole is connected to one end of a reset spring, and the other end of the reset spring is connected to the housing.

[0023] Additionally, the elastic element is a torsion spring; the elastic element includes a spiral portion connected between the first contact portion and the second contact portion; the spiral portion is encased in a spring shaft and connected to the housing; and the first contact portion and the second contact portion are both arranged vertically to an axis of the spiral portion; the second contact element is arranged across one side of the movable contact of the neutral pole near the static contact of the neutral pole; the first contact element and the elastic element are arranged on one side of the movable contact of the neutral pole away from the static contact of the neutral pole; the movable contact of the neutral pole is connected to the second contact element through the reset spring; the second contact portion passes through one side of the movable contact of the neutral pole and then matches the second contact element; and the first contact element is connected with a test resistor arranged below the first contact element.

[0024] Additionally, the first contact element and the shaft-machine coupling drive rod are arranged opposite each other on two sides of the elastic element, a fourth V-shaped contact arm is arranged on the first contact portion, one end of the fourth contact arm is inclined towards a side close to the shaft-machine coupling drive rod, and the other end of the fourth contact arm is inclined towards a side close to the first contact element.

[0025] Additionally, one end of the shaft-machine coupling drive rod is connected to one end of the guard drive rod, and a through hole of the shaft-machine coupling drive rod coincident with the other end of the shaft-machine coupling drive rod is arranged in the guard lever; the other end of the guard drive rod is provided with a contact drive rod rotationally connected to the movable contact of the neutral pole; and one end of said guard drive rod is laminated into the guard lever, and the movable contact of the neutral pole is laminated into the other end of the movable contact of the neutral pole.

[0026] Additionally, the test button includes a button connection portion, and a button operating portion and a button push portion respectively arranged at two ends of the button connection portion, the other end of the button operating portion extends out of the housing, the other end of the button push portion matches the second contact portion, the button connection portion is connected to one end of the upper side of the button push portion, the other end of the upper part of the button actuation portion is fitted into the housing, the lower part of the button actuation portion is provided with a first button actuation portion and a second button actuation portion that extend respectively to two sides of the first contact portion, and between the first button actuation portion and the second button actuation portion a button actuation groove is formed fitted into the second contact portion.

[0027] The circuit breaker of the present invention is a leakage circuit breaker, comprising the phase pole of the circuit breaker and the leakage protection pole. The test mechanism arranged on the leakage protection pole forms a double-break test loop through two contact points of the first and second contact portions on the elastic element. The first contact portion is actuated by either the leakage operating mechanism or the phase pole operating mechanism, and the second contact portion is actuated by the test button. This not only ensures that the test loop is not performed by pressing the test button when the phase pole of the circuit breaker is off, but also improves the reliability of the circuit breaker. Furthermore, according to an improved embodiment of the present invention, the elastic element is aligned with the leakage operating mechanism, which also increases the operating speed of the leakage operating mechanism. Furthermore, the elastic element incorporates a torsion spring, which can be directly encased in the housing for installation. Assembly is further simplified by limiting one end of the elastic element through a spring-loaded groove in the housing, resulting in a simple structure and low cost. One end, suspended from a first conductive plate, aligns with the protective lever and the first contact portion. The conductive plate's inherent elasticity dampens the contact with the first contact portion, preventing damage to the housing from harsh contact.

[0028] Furthermore, according to the third improved embodiment of the present invention, the elastic element is aligned with the phase pole actuating mechanism. The phase pole actuating mechanism simultaneously actuates the neutral pole's moving contact via the neutral line actuating element, and the elastic element is actuated by the neutral line actuating element. This ensures that the test loop is not performed by pressing the test button when the circuit breaker's phase pole is disconnected, thus greatly improving the circuit breaker's reliability. Moreover, the operating speed of the mechanism can also be increased by aligning the elastic element with the operating mechanism. This is particularly important when an overload or leakage current occurs in the circuit, as the circuit breaker can trip more quickly to interrupt the circuit.

[0029] Brief description of the drawings

[0030] Figure 1 is a schematic structural diagram of an upper side of a circuit breaker;

[0031] Figure 2 is a schematic structural diagram of a leakage protection pole in embodiment 1;

[0032] Figure 3 is a front view of the leakage protection pole in embodiment 1;

[0033] Figure 4 is another schematic structural diagram of the leakage protection pole in embodiment 1;

[0034] Figure 5 is a schematic structural diagram of an elastic element in embodiment 1;

[0035] Figure 6 is a schematic structural diagram of a first contact element in embodiment 1;

[0036] Figure 7 is a schematic structural diagram of a test button in embodiment 1;

[0037] Figure 8 is a schematic structural diagram of a front face of a guard lever in embodiment 1;

[0038] Figure 9 is a schematic structural diagram of a rear face of the guard lever in embodiment 1;

[0039] Figure 10 is a front view of a circuit breaker phase pole in embodiment 2;

[0040] Figure 11 is a front view of a leakage protection pole in embodiment 2;

[0041] Figure 12 is a schematic matching diagram between a leak-checking mechanism and a leak-running mechanism in embodiment 2;

[0042] Figure 13 is a schematic diagram of the coincidence between a moving neutral pole contact, a protective actuating rod and a protective lever in embodiment 2;

[0043] Figure 14 is a side view of Figure 12;

[0044] Figure 15 is a schematic structural diagram of an elastic element in embodiment 2;

[0045] Figure 16 is a schematic structural diagram of a protective actuating rod in embodiment 2;

[0046] Figure 17 is a schematic structural diagram of a test button in embodiment 2;

[0047] Figure 18 is a schematic diagram of the match between a shaft-machine coupling drive rod and the guard lever in embodiment 2;

[0048] Figure 19 is a top view of an elastic element in embodiment 3;

[0049] Figure 20 is a side view of the elastic element of embodiment 3;

[0050] Figure 21 is a schematic diagram of a local structure of a circuit breaker in embodiment 3;

[0051] Figure 22 is a schematic matching diagram between a leak-checking mechanism and a leak-running mechanism in embodiment 3;

[0052] Figure 23 is another schematic diagram of the match between the leak-checking mechanism and the leak-operating mechanism in embodiment 3;

[0053] Figure 24 is a schematic structural diagram of a leakage protection pole in embodiment 3; Figure 25 is a schematic structural diagram of a phase pole operating mechanism in embodiment 3;

[0054] Figure 26 is a schematic diagram of a current flow direction in a leakage test loop when the circuit breaker is positively connected; and

[0055] Figure 27 is a schematic diagram of the direction of current flow in the leakage test loop when the circuit breaker is connected in reverse.

[0056] Detailed description of preferred embodiments

[0057] Specific implementations of a circuit breaker of the present invention are described below with reference to the implementations shown in Figure 1 to Figure 27. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0059] As shown in Figure 1 to Figure 4 and Figure 9 to Figure 10, a circuit breaker of the present invention includes a housing, and a circuit breaker phase pole 1 and a leakage protection pole 2 arranged on two sides of the housing side by side. A separator plate 32 is arranged between the phase pole of circuit breaker 1 and the leakage protection pole 2. The phase pole of circuit breaker 1 includes a static contact 111 and a moving contact 112 arranged opposite each other and connected to a circuit, respectively. The moving contact 112 is installed in the operating mechanism of the phase pole 14 to oscillate and align with the static contact 111. The leakage protection pole 2 includes a zero-sequence current transformer 21, a leakage operating mechanism 22, and a leakage checking mechanism 25. A main loop from the phase pole of circuit breaker 1 passes through the zero-sequence current transformer 21. The zero-sequence current transformer 21 is capable of unlocking the operating mechanism of the phase pole 14 via the leakage operating mechanism 22 to actuate the moving contact 112, causing it to separate from the static contact 111 when leakage current occurs in the main loop.

[0061] The leakage test mechanism 25 includes a spring element 26, a test button 29, and a first contact element 27 and a second contact element 28 connected respectively to the main loop of the phase pole of circuit breaker 1. One end of the spring element 26 is provided with a first contact portion 261 that matches the leakage operating mechanism 22 or the phase pole operating mechanism 14, and the other end of the spring element 26 is provided with a second contact portion 262 that matches the test button 29. The leakage operating mechanism 22 or the phase pole operating mechanism 14 is capable of pushing the first contact portion 261 to make contact with the first contact element 27 when phase pole 1 of the circuit breaker is energized, and the test button 29 is capable of pushing the second contact portion 262 to make contact with the second contact element 28. When the first contact portion 261 and the second contact portion 262 come into contact with the first contact element 27 and the second contact element 28 respectively, the test loop is able to be driven to generate a leak test signal in the main loop.

[0063] According to the circuit breaker of the present invention, the test mechanism 25 forms the test loop with double breaking points through two contact points of the first contact portion 261 and the second contact portion 262 on the elastic element 26, which can not only ensure that the test loop is carried out by pressing the test button 29 when the phase pole 1 of the circuit breaker is disconnected, and improve a reliability of the circuit breaker, but also increase a speed of action of the leakage operating mechanism 22 or the phase pole 14 operating mechanism by matching between the first contact portion 261 and the leakage operating mechanism 22 or the phase pole 14 operating mechanism, especially when an overload or leakage current occurs in the circuit, the leakage operating mechanism 22 can be helped to trip the circuit vessel more quickly to cut off the circuit.

[0065] Figure 10 shows an implementation of the operating mechanism of phase pole 14. The operating mechanism of phase pole 14 includes a circuit breaker energy storage element, a rocker arm 141 pivotally installed in the housing and connected to the movable contact 112, a jump buckle 142 and a locking latch 143 pivotally installed on the rocker arm 141 respectively and fastened together, and a connecting rod 144 articulated with the jump buckle 142. The other end of the connecting rod 144 is articulated with a circuit breaker handle 31 extending out of the housing. When the jump buckle 142 and the locking latch 143 fasten together, the phase pole drive mechanism 14 is held in equilibrium. The circuit breaker handle 31 is then able to actuate the phase pole drive mechanism 14, and the moving contact 112 moves to make contact with the static contact 111 to conduct the main loop and to separate from the static contact to disconnect the main loop, thus connecting and disconnecting the circuit breaker. Additionally, energy is stored in the circuit breaker's energy storage element during energization.

[0067] Additionally, the phase pole of circuit breaker 1 includes an electromagnetic release mechanism 12, a bimetallic release mechanism 13, and an arc-extinguishing mechanism. The static contact 111 is fixed to the housing and connected to the electromagnetic release mechanism 12 and a wiring terminal 15 at the left end via a major loop conductor. The moving contact 112 is installed in the operating mechanism of the phase pole 14 to oscillate and align with the static contact 111 and connected to the bimetallic release mechanism 15 and a wiring terminal of the circuit breaker 14 at the right end via a major loop conductor. In the event of a short circuit, overload, or leakage in the circuit, the jump buckle 142 and the locking latch 143 are actuated to separate and unlock from each other via the electromagnetic release mechanism 12, the bimetallic release mechanism 13, and the leakage operating mechanism 22 respectively, so that the phase pole operating mechanism 14 is unbalanced, and the moving contact 112 is actuated to separate from the static contact 111 through the release of energy from the energy storage element to disconnect the main loop, thus interrupting a fault circuit to implement protection.

[0069] Figures 2 to 9 show Embodiment 1 of the circuit breaker of the present invention. The leakage operating mechanism 22 and the leakage testing mechanism 25 are arranged correspondingly on one side above the zero-sequence current transformer 21, a leakage release 23 is arranged on the other side above the zero-sequence current transformer 21, and the circuit breaker handle 31 is arranged correspondingly above the leakage release 23. The leakage operating mechanism 22 includes a protective lever 221 pivotally installed in the housing, and a protective jump buckle 222 and a protective locking latch 224 pivotally installed on the protective lever 221 respectively and fastened together. The protective trip buckle 222 is hinged to one end of a protective connecting rod 223, and the other end of the protective connecting rod 223 is hinged to the circuit breaker handle 31. One end of the protective locking latch 224 is arranged to correspond with the leakage release 23, the first contact element 27 is arranged on one side of the protective lever 221, and the first contact portion 261 of the elastic element 26 extends between the protective lever 221 and the first contact element 27 to align with the protective lever 221. When the circuit breaker handle 31 is rotated to a connection location, the protective lever 221 is actuated by the protective connecting rod 223, the protective trip buckle 222, and the protective locking latch 224 to rotate and push the first contact portion 261 into contact with the first contact element. 27. When the handle of the circuit breaker 31 rotates towards a disconnection location, the protective lever 221 is actuated to move away from the first contact portion 261, and the first contact portion 261 is reset under its own elasticity and pushes the handle of the circuit breaker 31 to rotate towards the disconnection location at an accelerated speed.

[0071] Figure 5 shows the first implementation of the spring element 26. The spring element 26 is a torsion spring, and the spring element 26 includes a coiled portion 263 connected between the first contact portion 261 and the second contact portion 262. The coiled portion 263 is installed on a spring shaft 260 of the housing, and the first contact portion 261 and the second contact portion 262 are both arranged vertically to an axis of the coiled portion 263. The first contact portion 261 extends between the guard lever 221 and the first contact element 27, and the second contact portion 262 extends between the test button and the second contact element 28. The first contact portion 261 includes a first contact arm 261a, a second contact arm 261b, and a third contact arm 261c connected in a U-shape. The first contact arm The first contact arm 261a and the third contact arm 261c are arranged opposite each other, and the second contact arm 261b is vertically connected between one end of the first contact arm 261a and the third contact arm 261c. The other end of the first contact arm 261a is connected to the spiral portion 263, and the other end of the third contact arm 261c is connected to a fourth contact arm 261d. The fourth contact arm 261d extends between the test button 29 and the second contact element 28, and a spring-restricted groove 261e for limiting the first contact arm 261a, the second contact arm 261b, and the third contact arm 261c is provided in the housing. The elastic element 26 adopts the torsion spring, which can not only be directly encased in the housing for installation, but also further reduces assembly difficulty by limiting one end of the elastic element 26 through the spring limiting slot 261e of the housing, with features of a simple structure and low cost.

[0073] Additionally, the fourth contact arm 261d is arranged substantially parallel to the second contact portion 262, and the first contact arm 261a, the second contact arm 261b, and the third contact arm 261c are arranged vertically to the second contact portion 262, which can improve the balance of the elastic element 26, and the elastic element 26 is able to be more reliably fixed to the housing when subjected to a torque.

[0075] Additionally, the first contact element 27 and the second contact element 28 are arranged below the leakage operating mechanism 22, and the first contact element 27 is arranged between the second contact element 28 and the spring element 26. The test button 29 is located on one side of the leakage operating mechanism 22 and above the second contact portion 262. A length of the second contact portion 262 is greater than that of the fourth contact arm 261d of the first contact portion 261. One end of the second contact portion 262, near the spiral portion 263, coincides with the test button 29, and the other end of the second contact portion 262 passes through one side of the first contact element 27 and extends above the second contact element 28. A test resistor 251 connected to the first contact element 27 is provided below a location between the first contact element and the second contact element 28. 27 and the elastic element 26, which not only has the characteristics of a compact structure and small volume, but also makes the length of the second contact portion 262 longer than that of the first contact portion 261, so that when the second contact portion 262 contacts the second contact element 28, a second installation projection 280 can be prevented from being damaged by the elasticity of the second contact portion 262, thus being more reliable in contact.

[0077] Figure 6 shows a preferred implementation of the first contact element 27. The first contact element 27 includes a first conductive plate 271 arranged along an axial direction of the spiral portion 263, and the elastic element 26 is arranged at intervals with the separator plate 32 along the axial direction. One end of the first conductive plate 271 is connected to the separator plate 32, and the other end of the first conductive plate 271 extends to one side of the guard lever 221 along the axis of the spiral portion 263 and is suspended. A suspended end of the first conductive plate 271 aligns with the guard lever 221 and the first contact portion 261, so that the first conductive plate can be cushioned by its own elasticity upon contact with the first contact portion 261, thereby preventing damage to the housing caused by a hard contact.

[0079] Furthermore, the first contact element 27 additionally includes a second conductive plate 272. One longitudinal direction of the second conductive plate 272 is arranged vertically to the first conductive plate 271, one end of the second conductive plate 272 is arranged opposite one end of the first conductive plate 271, and one end of the second conductive plate 272 is connected to a lateral edge of one side of the first conductive plate 271 via a third conductive plate 273 to form a first installation portion with a U-shaped structure. A first installation slot 270 connected with the first installation portion is arranged in the divider plate 32, and the other end of the second conductive plate 272 extends out of the first installation slot 270. The second conductive plate 272 not only facilitates a reliable connection between the first contact element 27 and the housing by forming the U-shaped structure, but also facilitates the gripping of the first contact element. contact 27 and perform a beginner-proof function during assembly, thus effectively reducing assembly difficulty.

[0081] Furthermore, a side edge on one side of the first conductive plate 271 near the elastic element 26 is connected to a fourth conductive plate 274. The third conductive plate 273 is connected to a side edge on one side of the first conductive plate 271 away from the elastic element 26, so that an opening in the first U-shaped installation portion faces the elastic element 26. The test resistor 251 is positioned on one side away from the second conductive plate 272 between the elastic element 26 and the first conductive plate 271. One end of the fourth conductive plate 274 is vertically connected to one side of the opening in the first installation portion. The other end of the fourth conductive plate 274 extends to the test resistor 251. A connection hole 275 is provided in the fourth conductive plate 274 for connecting the test resistor 251. The first contact element 27 is arranged With the opening of the first installation portion oriented towards the test resistor 251 on one side of the elastic element 26, and meanwhile, the fourth conductive plate 274 extending towards the test resistor 251 is arranged on one side of the opening of the first installation portion, this not only compacts the structure of the first conductive plate 271 and reduces the space it occupies, but also facilitates connection to the test resistor 251 by soldering and other means. In addition, a conductive wire at one end of the test resistor 251 can pass through the connection hole 275 to intertwine with the fourth conductive plate 274 first, and then connect to the fourth conductive plate 274, which not only improves connection strength, but also reduces connection difficulty. Preferably, the two ends of the test resistor 251 are each provided with a resistor mounting plate 252, and the two resistor mounting plates 252 are each provided with a bypass hole to prevent the conductor wires from entering the two ends of the test resistor 251. Certainly, the test resistor 251 may not be provided, and the opening of the first U-shaped mounting portion may be oriented away from the elastic element 26. Both forms fall within the scope of protection of the present invention.

[0083] Figure 3 shows a preferred implementation of the second contact element 28. A second mounting projection 280 arranged along an axial direction of the spiral portion 263 is positioned on the separator plate 32, and the second contact element 28 includes a first U-shaped conductor 281 bent inversely into the second mounting projection 280. One end of the first conductor 281 is located on an upper side of the second mounting projection 280 and aligned with the second contact portion 262, and the other end of the first conductor 281 is located on a lower side of the second mounting projection 280 and connected to the main loop conductor via the second conductor 282.

[0085] Figure 7 shows the first implementation of the test button 29. The test button 29 includes a button connection portion 291, and a button operating portion 292 and a button push portion 293, respectively, arranged at two ends of the button connection portion 291. The other end of the button operating portion 292 extends out of the housing, and the other end of the button push portion 293 engages with the second contact portion 262. The button push portion 293 is arranged in a gap with the spacer plate 32. A button guide plate 294 (Figure 3) extending to the button push portion 293 is arranged on the spacer plate 32, and a button guide groove 295 that slides into the button guide plate 294 is arranged on a side face of the button push portion 293. The test button 29 is guided through the guide plate of button 294, so that the test button 29 can operate more smoothly and reliably.

[0087] Additionally, a U-shaped portion 291a protruding from the button is disposed in the portion 291 connected to the button, and a space 291b avoiding the button (Figure 2) is formed between the protruding portion of the button 291a and a side wall of the housing. The protruding portion of the button 291a is connected to one end of the upper side of the portion pushing the button 293, and the other end of the upper side of the portion pushing the button 293 is in boundary fit with the housing. The lower side of the push-button portion 293 is provided with a first push-button portion 297 and a second push-button portion 298 that extend respectively to two sides of the first contact portion 261, and a push-button groove 299 in boundary fit with the second contact portion 262 is formed between the first push-button portion 297 and the second push-button portion 298.

[0089] Furthermore, a side face of the button guide plate 294 is provided with a contact guide groove 296 that aligns with the first contact portion 261. When the first contact portion 261 is pushed by the test button 29 to reset itself due to its own elasticity, the first contact portion is able to slide along the contact guide groove 296, and the location of the first contact portion 261 after resetting is limited by the contact guide groove 296, so that the button guide plate 294 can also guide the first contact portion 261 when guiding the test button 29. In addition, the button guide plate 294 can also form a side wall of the spring limiting groove 261e.

[0091] Figure 8 and Figure 9 show the first implementation of the protective lever 221. The protective lever 221 is fan-shaped; a middle portion of one side of the protective lever 221 is provided with a hole for the protective lever shaft 2210 rotatably connected to the housing, and a middle portion of a front face of the protective lever 221 is provided with a hole for the retaining shaft 2218 connected to the protective locking latch 224. A jump buckle shaft 2217 and a protective lever shaft 2216 are correspondingly arranged on two sides of the catch shaft hole 2218 respectively; the jump buckle shaft 2217 is connected to the protective jump buckle 222, and the protective lever shaft 2216 is connected to the housing. A first lever projection 2214 is arranged on the rear face of the guard lever 221 corresponding to the opposite side of the guard lever shaft hole 2210. A first push projection 2211 extending to one side of the first contact portion 261 is arranged on the rear face of the guard lever 221 corresponding to an upper corner of one side of the guard lever shaft hole 2210. A second lever projection 2215 is arranged on the opposite side of the guard lever shaft hole 2210 relative to the first push projection 2211. A first lever groove 2215 is arranged on one side of the first lever projection 2214 away from the guard lever shaft hole 2210. The first contact portion 261 is pushed by arranging the first push projection 2211 on the guard lever 221, thus ensuring reliable contact between the first contact portion 261 and the first contact element 27.

[0093] A second thrust projection 2212 extending to a side face is arranged at the upper corner provided with the first thrust projection 2211 on the guard lever 221. A thrust step face 2213 to limit the first contact portion 261 is formed between the second thrust projection 2212 and the first thrust projection 2211. The thrust step face 2213 can make the guard lever 221 more closely match the first contact portion 261, preventing the first contact portion 261 from becoming misaligned with the first thrust projection 2211.

[0095] Figures 10 to 18 show embodiment 2 of the circuit breaker of the present invention. The leakage protection pole 2 includes the zero-sequence current transformer 21, the leakage operating mechanism 22, the leakage checking mechanism 25, and a static neutral pole contact 211 and a movable neutral pole contact 212 arranged opposite each other in the housing. The movable neutral pole contact 212 is connected to the leakage operating mechanism 22 via the protective actuating rod 225. The other end of the protective actuating rod 225 is articulated to one side of the leakage operating mechanism 22 via a shaft-machine coupling actuating rod 220, and the other side of the leakage operating mechanism 22 is connected to the circuit breaker handle 31. The shaft-machine coupling actuating rod 220 is arranged vertically to a plane of oscillation of the protective actuating rod 225, and two ends of the shaft-machine coupling actuating rod 220 are connected respectively to the protective actuating rod 225 and the leakage operating mechanism 22. The first contact element 27 is arranged on one side of the shaft-machine coupling actuating rod 220, and the first contact portion 261 of the elastic element 26 extends between the coupling actuating rod and the shaft-machine coupling actuating rod. shaft-machine 220 and the first contact element 27 to match a middle portion of the shaft-machine coupling actuating rod 220. The test push button 29 is able to push the second contact portion 262 to make contact with the second contact element 28, and the shaft-machine coupling actuating rod 220 pushes the first contact portion 261 to make contact with the first contact element 27 when the circuit breaker is connected.

[0097] When the circuit breaker handle 31 rotates to a connection location, the leakage operating mechanism 22 drives the protective operating rod 225 via the shaft-machine coupling operating rod 220. The neutral pole static contact 211 is then driven to make contact with the neutral pole moving contact 212, and the first contact portion 261 is pushed to make contact with the first contact element 27 via the shaft-machine coupling operating rod 220. When the circuit breaker handle 31 rotates to a disconnection location, the shaft-machine coupling operating rod 220 is driven away from the first contact portion 261, and the first contact portion 261 is restored by its own elasticity and pushes the circuit breaker handle 31 to rotate to the disconnection location at an accelerated speed. In the implementation, based on the test loop with double breaking points, the first contact portion 261 is driven to make contact with the first contact element 27 by the shaft-to-moving machine coupling drive rod 220 of the leakage operating mechanism 22, which not only ensures that the test loop is not carried out by pressing the test button 29 when the phase pole of the circuit breaker 1 is disconnected, and further improves the reliability of the circuit breaker, but also further increases the speed of action of the leakage operating mechanism 22 by matching between the elastic element 26 and the shaft-to-moving machine coupling drive rod 220.

[0099] As a preferred implementation of the leak-through operating mechanism 22, the leak-through operating mechanism 22 includes the guard lever 221 pivotally installed in the housing, and the guard jump buckle 222 and guard lock closure 224 pivotally installed on the guard lever 221 respectively and fastened together. The protective trip buckle 222 is hinged to one end of the protective connecting rod 223, and the other end of the protective connecting rod 223 is hinged to the circuit breaker handle 31. The protective actuating rod 225 is hinged to the protective lever 221 via the shaft-machine coupling actuating rod 220. The movable neutral pole contact 212 is hinged to the protective actuating rod 225, and the movable neutral pole contact 212 is connected to one end of the reset spring 227. The other end of the reset spring 227 is connected to the housing. When the protective trip buckle 222 and the protective locking latch 224 are fastened together, the circuit breaker handle 31 is able to actuate the movable neutral pole contact 212, causing it to move via the protective actuating rod 225. The protective shaft-machine coupling drive rod 220 is connected to one end of the protective drive rod 225. A through-hole in the shaft-machine coupling drive rod that matches the other end of the shaft-machine coupling drive rod 220 is arranged in the protective lever 221. The other end of the shaft-machine coupling drive rod 220 passes through the through-hole of the shaft-machine coupling drive rod and extends to the other side of the protective lever 221 to connect with a limiting element 226. Certainly, other solutions can also be used in the leakage operating mechanism 22.

[0101] With reference to figure 3, a circuit breaker connection process is as follows: the circuit breaker handle 31 rotates clockwise, handle 31 pushes link 223, link 223 pushes the protective jump buckle 222 and protective locking latch 224 to actuate the protective lever 221 to rotate clockwise, and the elastic element 261 is compressed through the protective lever 221 to store energy until the mechanism is connected.

[0103] The release process is as follows: when an overload or leakage current occurs in the circuit, the leakage releaser 23 pushes the protection locking latch 224 and the protection jump buckle 222 to unlock and release the protection lever 221, and the protection lever 221 is able to rotate more rapidly counterclockwise under the action of the reset spring and the elastic element 261.

[0104] Additionally, one end of the reset spring 227 is connected to the neutral pole movable contact 212, and the other end of the reset spring is connected to the second contact element 28. The second contact element 28 not only serves as a test loop breaking point, but also serves to fix the reset spring 227. Meanwhile, the reset spring 227 not only serves to match the neutral pole movable contact 212, but also serves to electrically connect the neutral pole movable contact 212 to the second contact element 28.

[0106] Additionally, the second contact element 28 is arranged on one side of the movable contact 212 of the neutral pole near the static contact 211 of the neutral pole, and the first contact element 27 and the elastic element 26 are arranged on one side of the movable contact 212 of the neutral pole away from the static contact 211 of the neutral pole. The moving neutral pole contact 212 is connected to the second contact element 28 via the reset spring 227. The second contact portion 262 passes through one side of the moving neutral pole contact 212 and then aligns with the second contact element 28. The first contact element 27 is connected to the test resistor 251 positioned below the first contact element 27. The first contact element 27 and the second contact element 28 are respectively arranged on the two sides of the static neutral pole contact 211. This design not only features a compact structure, short stroke, and fast action speed, but also resets the moving neutral pole contact 212 by connecting the second contact element 28 to the reset spring 227, effectively completing the test loop. This design effectively kills two birds with one stone.

[0108] Figures 12 to 16 show a preferred implementation of the protective actuating rod 225. One end of the protective actuating rod 225 is provided with a shaft-machine coupling actuating projection 2251 arranged along an axial direction of the shaft-machine coupling actuating rod 220. A shaft-machine coupling actuating bore 2252, sheathed in the shaft-machine coupling actuating rod 220, is arranged in the shaft-machine coupling actuating projection 2251. The other end of the protective actuating rod 225 is provided with a contact actuating projection 2253. A contact actuating rod 2254, rotatably connected to the movable neutral pole contact 212, is arranged in the contact actuating projection 2253. The contact actuating rod 2254 is arranged vertically to the plane of oscillation of the movable neutral pole contact 212. The end of the protective drive rod 225 is laminated into the protective lever 221, and the movable neutral pole contact 212 is laminated into the other end of the protective drive rod 225. In implementation, the shaft-machine coupling drive hole 2252 is arranged at one end of the protective drive rod 225, and the contact drive rod 2254 is arranged at the other end of the protective drive rod 225, with characteristics of simple structure, convenient processing and convenient assembly, and the shaft-machine coupling drive protrusion 2251 is able to improve a connection force between the shaft-machine coupling drive hole 2252 and the shaft-machine coupling drive rod 220.

[0109] Figure 15 shows the second implementation of the elastic element 26. The elastic element 26 is the torsion spring, and the elastic element 26 includes the coiled portion 263 connected between the first contact portion 261 and the second contact portion 262. The coiled portion 263 is encased in the spring shaft 260 and connected to the housing. The first contact portion 261 and the second contact portion 262 are both arranged vertically with respect to an axis of the coiled portion 263; the first contact portion 261 extends between the guard lever 225 and the first contact element 27, and the second contact portion 262 extends between the test button 29 and the second contact element 28.

[0110] The first contact portion 261 includes the first contact arm 261a, the second contact arm 261b, and the third contact arm 261c connected in a U-shape. The first contact arm 261a and the third contact arm 261c are arranged opposite each other, and the second contact arm 261b is vertically connected between one end of the first contact arm 261a and the third contact arm 261c. The other end of the first contact arm 261a is connected to the spiral portion 263, and the other end of the third contact arm 261c is connected to the fourth contact arm 261d. The fourth contact arm 261d extends between the test button 220 and the second contact element 28, and the first contact portion 261 is inserted into the spring-limiting groove 261e along a direction of the second contact arm 261b for a limited fit.

[0111] Additionally, the first contact element 27 and the drive rod of the shaft-machine coupling 220 are arranged opposite each other on two sides of the elastic element 26, and the fourth contact arm 261d of the first contact portion 261 is V-shaped. One end of the fourth contact arm 261d is angled to one side near the drive rod 220 of the shaft-machine coupling, and the other end of the fourth contact arm 261d is angled to one side near the first contact element 27. The V-shaped fourth contact arm 261d of the first contact portion 261 can not only effectively reduce the distance between the first contact portion 261 and the first contact element 27, and accelerate the driving speed of the test loop, but also has greater elasticity and a fast reset speed without damaging the first contact element 27 due to hard contact.

[0112] Additionally, an end portion of the fourth contact arm 261d is provided with a bent contact arm 261f bent towards the first contact element 27, and an outer side of the bent contact arm 261f is in snug contact with the first contact element 27, which can increase a contact area and ensure reliable contact.

[0113] With reference to Figure 12 to Figure 16, a triangular movable contact guide groove 213 is placed in the housing in the central portion of the movable neutral pole contact 212, and a movable contact guide column 214 is inserted into the movable contact guide groove 213 and aligned with the movable contact guide groove 213. One end of the reset spring 227 is fitted into the guide groove 213. The movable neutral pole contact 212 is provided respectively with a protective drive rod shaft hole and a movable neutral pole contact point 215 corresponding to two sides of the movable contact guide groove 213, and the movable neutral pole contact point 215 is in contact with a static neutral pole contact point 216 in the static neutral pole contact 211. The movable neutral pole contact 212 in implementation has characteristics of small volume, simple structure, and convenient processing and manufacturing. and is able to reduce production costs and assembly difficulty.

[0114] Additionally, the movable neutral pole contact 212 is V-shaped, the central portion of the movable neutral pole contact 212 protrudes to one side near the second contact element 28, and an opening 217 that prevents the first contact element 27 is formed on the other side of the movable neutral pole contact 212. The movable neutral pole contact point 215 and the hole of the protective drive bar shaft are respectively arranged at two ends of the V-shaped movable neutral pole contact 212, and one side of the movable neutral pole contact 212 is provided with the test resistor 251 connected with the first contact element 27, which can prevent mutual interference between parts, further compact a structure of the test mechanism and reduce an occupied space.

[0115] Figure 11 and Figure 17 show the second implementation of the test button. The test button 29 includes the connection portion of button 291, and the operating portion of button 292 and the push portion of button 293, respectively arranged at two ends of the connection portion of button 291. The other end of the operating portion of button 292 extends out of the housing, and the other end of the push portion of button 293 aligns with the first contact portion 261. The connection portion of button 291 is connected to one end of the upper side of the push portion of button 293, and the other end of the upper side of the push portion of button 293 is in a boundary fit with the housing. The lower side of the push-button portion 293 is provided by the first push-button portion 297 and the second push-button portion 298 which extend respectively to two sides of the first contact portion 261, and the push-button groove 299 in boundary fit with the first contact portion 261 is formed between the first push-button portion 297 and the second push-button portion 298.

[0116] Figures 19 to 27 show embodiment 3 of the circuit breaker of the present invention. This embodiment differs from prior embodiment 2 in that a neutral line actuating element is not connected between the leakage operating mechanism 22 and the neutral pole movable contact 212. In this embodiment, the neutral line actuating element is connected between the phase pole 14 actuating mechanism of phase pole 1 of the circuit breaker and the neutral pole movable contact 212, and an action of the neutral line actuating element is actuated by the phase pole 14 actuating mechanism of phase pole 1 of the circuit breaker. The neutral line actuating element includes the protective actuating rod 225 connected to the neutral pole movable contact 212 of the neutral line movable contact and the shaft-machine coupling actuating rod 220 connected between the protective actuating rod 225 and the leakage protection mechanism 22. The first contact portion 261 of the elastic element 26 coincides with the protective actuating rod 225 of the neutral line actuating element.

[0117] Specifically, leakage protection phase pole 2 is arranged on one side of circuit breaker phase pole 1, and leakage protection phase pole 2 includes zero sequence current transformer 21, leakage operating mechanism 22, leakage release 23, leakage testing mechanism 25, a protection circuit board 211, and a neutral line contact mechanism.

[0118] The phase pole of circuit breaker 1 includes the phase pole release, the phase pole operating mechanism 14, and a phase pole contact mechanism. The phase pole release includes the electromagnetic release mechanism 12 and/or the bimetallic release mechanism 13.

[0119] The phase pole contact mechanism includes the static contact 111 and the moving contact 112, each connected to a phase line. The neutral line contact mechanism includes the moving neutral pole contact 212 and the static neutral pole contact 211, each connected to a neutral line. The moving neutral pole contact 212 is connected to the phase pole actuating mechanism 14 of the phase pole of circuit breaker 1 via the protective actuating rod 225.

[0120] The leak test mechanism 25 includes the test button 29 and the leak test loop. The leak test loop includes the spring element 26, the first contact element 27, and the second contact element 28. The spring element 26 includes the first contact portion 261 and the second contact portion 262 connected together. The first contact portion 261 is arranged between the first contact element 27 and the protective actuating rod 225, and the second contact portion 262 is arranged between the second contact element 28 and the test button 29.

[0121] When phase pole 1 of the circuit breaker is connected, the phase pole actuating mechanism 14 pushes the first contact portion 261 of the spring element 26 into contact with the first contact element 27 via the protective actuating rod 225, and when the test button 29 is pressed, the test button 29 pushes the second contact portion 262 of the spring element 26 into contact with the second contact element 28. A loop is formed between the first contact element 27 and the second contact element 28 via the spring element 26, thus performing the leakage test loop.

[0122] The zero-sequence current transformer 21 of phase 2 of the leakage protection circuit is sheathed in the neutral line and in the leakage test loop. When the leakage test loop is performed, the occurrence of leakage current in the neutral line is simulated, so that the zero-sequence current transformer 21 induces the leakage current. The zero-sequence current transformer 21 actuates the leakage relay 23 to unlock the leakage operating mechanism 22, and simultaneously, the leakage operating mechanism 22 actuates the phase pole 14 actuating mechanism of phase pole 1 of the circuit breaker to unlock. When the phase pole 14 actuating mechanism unlocks, the moving contact 111 is actuated to separate from the moving contact 112 to disconnect the connected phase line. Meanwhile, the moving neutral pole contact 212 is actuated to separate from the static neutral pole contact 211 via the protective actuating rod 225 to disconnect the connected neutral line.

[0123] The first contact portion 261 of the elastic element 26 and the first contact element 27 form a first test contact point of the leak test loop, and the second contact portion 262 of the elastic element 26 aligns with the second contact element 28 to form a second test contact point of the leak test loop. The connection and disconnection of the second test contact point is controlled by the test button 29.

[0124] After connecting the circuit breaker to a power supply, when phase pole 1 of the circuit breaker is in the disconnected state, the second test contact point is in the disconnected state and at that time the test button 29 is pressed. After connecting the second test contact point, as the first test contact point is in the disconnected state, the leakage test loop cannot be performed, and one load side of the circuit breaker cannot form a voltage to ground or a voltage to the protection printed circuit board 211.

[0125] When phase 1 of the circuit breaker is in the connected state, the first test contact is also connected. At that moment, test button 29 is pressed, connecting the first test contact and performing the leakage test loop to simulate a leakage signal. If phase 1 of the circuit breaker trips, the leakage protection function of phase 2 will not fail.

[0126] According to the circuit breaker embodiment, the first contact portion 261 of the elastic element 26 and the first contact element 27 form the first test contact point of the leakage test loop, and the second contact portion 262 of the elastic element 26 matches the second contact element 28 to form the second test contact point of the leakage test loop. The connection and disconnection of the second test contact point are controlled by test button 29, and the first test contact point is controlled by the operating mechanism of phase pole 14 of phase pole 1 of circuit breaker 1, so that the connection and disconnection of the first test contact point are synchronized with the switching on and off of phase pole 1 of circuit breaker 1, which can not only effectively prevent a single contact point leakage test loop from being performed by pressing test button 29 when phase pole 1 of the circuit breaker is disconnected, resulting in a voltage to ground or a voltage on the protection printed circuit board 211 generated by the leakage test loop, but also has characteristics of a compact structure, small volume and high reliability. When the circuit breaker handle 31 rotates towards the connection position, the phase pole 14 drive mechanism of the circuit breaker's phase pole 1 actuates the protective drive rod 225 to push the first contact portion 261 into contact with the first contact element 27 via the shaft-machine coupling drive rod 220. When the circuit breaker handle 31 rotates towards the disconnection position, the phase pole 14 drive mechanism of the circuit breaker's phase pole 1 actuates the protective drive rod 225 to move away from the first contact portion 261 via the shaft-machine coupling drive rod 220.

[0127] In the implementation, based on the test loop with double break points, the first contact portion 261 is driven by the protective drive rod 225 of the leakage operating mechanism 22 instead of the shaft-machine coupling drive rod 220 of the leakage operating mechanism 22, and a contact area between the protective drive rod 225 and the first contact portion 261 is larger, which not only makes the match more reliable, but also makes the assembly less difficult.

[0128] With reference to embodiments 1 and 2, the circuit breaker of the present invention includes the phase pole of the circuit breaker 1 (Figure 1), the leakage protection pole 2 (Figure 2), the leakage checking mechanism 25 (Figure 3), and the operating mechanism coincides respectively with the phase pole of the circuit breaker 1 and the leakage protection pole 2. The phase pole of the circuit breaker 1 and the leakage protection pole 2 include, respectively, the phase pole contact mechanism and the neutral line contact mechanism connected to the circuit.

[0129] When the circuit breaker is connected, the actuating mechanism engages the phase pole contact mechanism and the neutral line contact mechanism to conduct the circuit. When the circuit fails, the actuating mechanism unlocks and engages the phase pole contact mechanism and the neutral line contact mechanism to disconnect the circuit.

[0130] The leakage test mechanism 25 includes the test button 29 and the leakage test loop. The leakage test loop includes the second test contact point, which is matched to the test button 29, and the first test contact point, which is matched to the operating mechanism. The test button 29 is capable of actuating the second test contact point to connect and disconnect. The operating mechanism is capable of actuating the first test contact point to connect and disconnect while simultaneously actuating the phase pole contact mechanism and the neutral line contact mechanism to conduct and disconnect the circuit. When both the first and second test contact points are connected, the leakage test loop is activated and generates a leakage fault test signal to unlock the operating mechanism. When either of the first or second test contact points is disconnected, the leakage test loop is deactivated.

[0131] According to the circuit breaker of the present invention, the first test contact point and the second test contact point of the leakage test loop are controlled respectively by the operating mechanism and the test button 29. Only when the first test contact point and the second test contact point are both connected, can the leakage test loop be performed, and when either of the two test contact points is disconnected, the leakage test loop cannot be performed, so that the load side of the circuit breaker cannot form a voltage to ground or a voltage to the circuit board, and the load and the circuit board are able to be reliably protected.

[0132] The circuit includes the phase line and the neutral line. The phase pole contact mechanism is connected to the phase line, and the neutral line contact mechanism is connected to the neutral line. The operating mechanism includes the phase pole operating mechanism 14 placed on the phase pole contact mechanism and the leakage operating mechanism 22 placed on one side of the phase pole operating mechanism 14 and placed on the neutral line contact mechanism, and the phase pole operating mechanism 14 and the leakage operating mechanism 22 match each other.

[0133] When the circuit breaker is connected, the phase pole actuating mechanism 14 and the leakage operating mechanism 22 are locked in an energy storage state, and the phase pole contact mechanism is actuated to conduct the phase line by the phase pole actuating mechanism 14. Meanwhile, the neutral line contact mechanism is actuated to conduct the neutral line by the leakage operating mechanism 22, and the phase pole actuating mechanism 14 or the leakage operating mechanism 22 corresponding to this circuit is unlocked and actuates the other to be unlocked, so that the phase pole contact mechanism and the neutral line contact mechanism respectively disconnect the phase line and the neutral line.

[0134] The first test contact point of the leakage test loop, matched with the operating mechanism, can be controlled by the leakage operating mechanism 22 of the operating mechanism, and can also be controlled by the phase pole operating mechanism 14 of the operating mechanism. The phase pole contact mechanism is connected to the phase pole actuating mechanism 14, the neutral line contact mechanism is connected to the phase pole actuating mechanism 14 or the leakage operating mechanism 22 through the neutral line actuating element, and the neutral line actuating element actuates the first test contact point to connect and disconnect.

[0135] A first test of the first test contact point controlled by the leakage operating mechanism 22 is embodiment 1 of the circuit breaker of the present invention. The neutral line contact mechanism is connected to the leakage operating mechanism 22 through the neutral line actuating element, and the first test contact point coincides with the neutral line actuating element. The neutral line actuating element includes the protective actuating rod 225 and the shaft-machine coupling actuating rod 220. One end of the protective actuating rod 225 is connected to the movable contact of the neutral pole 212, and the other end of the protective actuating rod 225 is articulated to the phase pole actuating mechanism 22 via the shaft-machine coupling actuating rod 220. The first contact portion 261 of the elastic element 26 aligns with the actuating rod 220 of the shaft-machine coupling; the actuating rod 220 of the shaft-machine coupling pushes the first contact portion 261 into contact with the first contact element 27; the movable contact 212 of the neutral pole aligns with one end of the reset spring 227, and the other end of the reset spring 227 aligns with the housing.

[0136] A first test of the first test contact point controlled by the operating mechanism of phase pole 14 is embodiment 2 of the circuit breaker of the present invention. The neutral line contact mechanism is connected to the operating mechanism of phase pole 14 via the neutral line actuating element, and the first test contact point coincides with the neutral line actuating element. The neutral line actuating element includes the protective actuating rod 225 and the shaft-machine coupling actuating rod 220. One end of the protective actuating rod 225 is connected to the neutral pole moving contact 212, and the protective actuating rod 225 is articulated to the phase pole actuating mechanism 14 via the shaft-machine coupling actuating rod 220. The first contact portion 261 of the elastic element 26 aligns with the protective actuating rod 225; the protective actuating rod 225 pushes the first contact portion 261 into contact with the first contact element 27; the neutral pole moving contact 212 is connected to one end of the reset spring 227, and the other end of the reset spring 227 is connected to the housing.

[0137] The two embodiments of the circuit breaker of the present invention have the following characteristics.

[0138] As shown in Figure 12, the leak-test mechanism 25 includes the first contact element 27 and the second contact element 28. The spring element 26 is the torsion spring, and the spring element 26 includes the coiled portion 263 connected between the first contact portion 261 and the second contact portion 262. The coiled portion 263 is encased in the spring shaft 260 and connected to the housing. The first contact portion 261 is arranged between the neutral line drive element and the first contact element 27, and forms the first test contact point with the first contact element 27. The second contact portion 262 is arranged between the second contact element 28 and the test button 29, and forms the second test contact point with the second contact element 28.

[0139] According to the circuit breaker of the present invention, the first contact portion 261 and the second contact portion 262 in the elastic element 26 respectively form the first test contact point and the second test contact point of the leakage test loop, which can not only ensure the reliability of the leakage test loop, but also improve the speed of action of the operating mechanism by matching the first contact portion 261 with the operating mechanism.

[0140] Figure 26 shows the leakage test loop when the circuit breaker is connected positively, and Figure 27 shows the leakage test loop when the circuit breaker is connected in reverse. One end of the leakage test loop is connected to the phase line to which the phase pole of circuit breaker 1 is connected, and the other end of the leakage test loop is connected to the neutral line to which the leakage protection pole 2 is connected. Specifically, the leakage test loop also includes test resistor 251 and reset spring 227. The first contact element 27 is connected to the phase line to the phase pole of circuit breaker 1 via test resistor 251. One end of the reset spring 227 is connected to the neutral line via the neutral line contact mechanism, and the other end of the reset spring 227 is rotatably installed on the second contact element 28. When the first and second test contact points are both connected, the leakage test loop is performed between the phase and neutral lines to generate the leakage fault test signal, which does not It can not only form the leakage test loop between the neutral line contact mechanism and the first contact element 27, but also increase a contact pressure of the neutral line contact mechanism by means of the reset spring 227. Certainly, other solutions can also be used in the leakage test loop to simulate the appearance of leakage current, all of which fall within the scope of protection of the present invention.

[0141] As shown in Figure 10 and Figure 21, the operating mechanism is connected to the handle of circuit breaker 31. The handle of circuit breaker 31 includes the phase pole handle 31a and a leakage protection handle 31b. The phase pole handle 31a is connected to the phase pole operating mechanism 14 of the phase pole of circuit breaker 1, and the leakage protection handle 31b is connected to the leakage operating mechanism 22 of the leakage protection pole 2. A push block 31c is positioned on the leakage protection handle 31b, and the push block 31c extends to one side of the phase pole handle 31a, which rotates in a connection direction. When rotating in the tripping direction in the event of a leakage current, the leakage protection handle 31b pushes the phase pole handle 31a to rotate in the tripping direction via the push block 31c, which can accelerate the circuit breaker's operating speed. When an overload or short circuit occurs, the phase pole handle 31a rotates in the tripping direction, but the leakage protection handle 31b does not activate. A fault can be identified by locating the phase pole handle 31a and the leakage protection handle 31b. If both the phase pole handle 31a and the leakage protection handle 31b activate, then the fault is caused by an overload or short-circuit current. If the phase pole handle 31a activates but the leakage protection handle 31b does not, then the fault is caused by a leakage current.

[0142] In embodiment 1 above, the neutral line contact mechanism is connected to the leakage protection mechanism 22 of the drive mechanism via the neutral line actuating element. The neutral line actuating element includes the protective actuating rod 225 connected to the movable contact of the neutral line and the shaft-machine coupling actuating rod 220 connected between the protective actuating rod 225 and the leakage protection mechanism 22. The first contact portion 261 of the elastic element 26 coincides with the protective actuating rod 225 of the neutral line actuating element or with the shaft-machine coupling actuating rod 220.

[0143] With reference to figure 26, according to the leakage test loop when the circuit breaker is positively connected, current flows from a wiring terminal 15 at the right end of the phase pole of circuit breaker 1, moves through contact 112 of the phase pole of circuit breaker 1, static contact 111 of the phase pole of circuit breaker 1, zero sequence current transformer 21 of leakage protection pole 2, a wiring terminal 15 at the left end of the phase pole 1 of the circuit breaker, test resistor 251, first contact element 27, second test contact point, first test contact point, elastic element 26, reset spring 227 and moving contact 212 of the neutral pole, and flows to the wiring terminal 15 at the right end of leakage protection pole 2.

[0144] With reference to figure 27, according to the test loop when the circuit breaker is connected in reverse, the current flows from the wiring terminal 15 at the left end of the phase pole of the circuit breaker 1, passes through the test resistor 251, the first contact element 27, the elastic element 26, the first test contact point, the second test contact point, the reset spring 227, the moving contact of the neutral pole 212, the static contact of the neutral pole 211 and the zero sequence current transformer 21, and flows to the wiring terminal 15 at the left end of the leakage protection pole 2.

[0145] Figures 19 to 20 show a structure of the elastic element in the embodiment. The structure of the elastic element 26 in the embodiment is the same as that of the elastic element 26 of embodiment 1, but the difference lies in the protective actuating rod 225. The first contact portion 261 of the elastic element 26 in the implementation coincides with the protective actuating rod 225. That is, the first contact element 27 and the protective actuating rod 225 are arranged opposite each other on two sides of the elastic element 26. The fourth contact arm 261d of the first contact portion 261 is V-shaped, and one end of the fourth contact arm 261d is inclined towards a side close to the protective actuating rod 225.

[0146] Specifically, the spring element 26 is the torsion spring, and the spring element 26 includes the coil portion 263 connected between the first contact portion 261 and the second contact portion 262. The coil portion 263 is encased in the spring shaft 260 and connected to the housing. The first contact portion 261 and the second contact portion 262 are both arranged vertically with respect to an axis of the coil portion 263; the first contact portion 261 extends between the guard lever 225 and the first contact element 27, and the second contact portion 262 extends between the test button 29 and the second contact element 28.

[0148] In addition, the spiral portion 263 is arranged on one side near the test button 29, and the first contact portion 261 has a U-shaped structure. The first contact portion 261 includes the first contact arm 261a and the third contact arm 261c, which are arranged oppositely, and the second contact arm 261b, which is vertically connected between one end of the first contact arm 261a and the second contact arm 261b. The second contact arm 261b is arranged parallel to an axis of the spiral portion 263, one end of the second contact arm 261b away from the first contact portion 261a extends to a plane of oscillation of the protective drive rod 225, and the other end of the first contact arm 261a is connected to the spiral portion 263. The third contact arm 261c extends between the protective drive rod 225 and the second contact element 28, and the third contact arm 261c and the protective drive rod 225 are arranged in the same plane.

[0150] Additionally, the other end of the third contact arm 261c, away from the second contact arm 261b, is connected to the fourth contact arm 261d by a V-shaped structure, and the fourth contact arm 261d extends between the guard drive rod 225 and the second contact element 28. A side edge on one side of the fourth contact arm 261d, connected to the second contact arm 261b, is inclined in a direction close to the guard drive rod 225, and a side edge on the other side of the fourth contact arm 261d is inclined in a direction close to the first contact element 27 to match the first contact element 27. A bend portion, coincident with the guard drive rod 225, is formed at a junction of the side edges on both sides of the fourth contact arm 261d, and the guard drive rod 225 pushes the bend portion of the fourth contact arm 261d. To make the fourth contact arm 261d move away from one end of the second contact arm 261b and the first contact element 27, thus connecting the second test contact point. The fourth contact arm 261d, with its V-shaped structure, not only optimizes the arrangement of parts to ensure a reliable and safe electrical distance between the first contact element 27 and other parts, but also reduces the distance between the first contact portion 261 and the protective actuating rod 225. This facilitates the actuating rod 225 in operating the first contact portion 261 and ensures the sensitivity of the elastic element 26.

[0152] Additionally, one end of the fourth contact arm 261d, coincident with the first contact element 27, is provided with the bent contact arm 261f. The bent contact arm 261f is bent to a side away from the first contact element 27, and an arc surface coincident with the first contact element 27 is formed outside the bent contact arm 261f. The fourth contact arm 261d contacts the first contact element 27 through the arc surface formed on the bent contact arm 261f, so that the contact area is larger and the contact is more reliable.

[0154] As shown in Figure 24, the separator plate 32 is arranged between the phase pole of the circuit breaker 1 and the leakage protection pole 2, and the spring shaft 260 for installing the spiral portion 263 of the spring element 26 is arranged on the separator plate 32. The partition plate 32 is provided with the button guide plate 294, which aligns with one side of the test button 29 on one side of the spring shaft 260, and the other side of the button guide plate 294 provides the spring limiting groove 261e, which aligns with the first contact portion 261 of the spring element 26. The spiral portion 263 is rotatably sleeved on the spring shaft 260, and the first contact arm 261a, the second contact arm 261b, and the third contact arm 261c of the first contact portion 261 are inserted into The spring-limiting groove 261e is for limited fit. Preferably, the third contact arm 261c extends out of the spring-limiting groove 261e and then connects with the fourth contact portion 261d, which has a simple assembly feature.

[0156] With reference to figure 24, the triangular moving contact guide slot 213 is arranged in the central portion of the moving neutral pole contact 212, and the moving contact guide column 214 inserted into the moving contact guide slot 213 and matched with the moving contact guide slot 213 is arranged in the housing. A rotating movable contact limiting element 219 is arranged in the contact guide column 214, and the movable neutral pole contact 212 is provided respectively with the shaft hole of the protective drive rod and the corresponding movable neutral pole contact point 215 on two sides of the movable contact guide slot 213. The shaft hole of the protective drive rod and one end of the movable contact limiting element 219 are rotatably fitted to one end of the contact drive rod 2254 respectively; the other end of the contact drive rod 2254 is rotatably connected to the protective drive rod 225, and the other end of the movable contact limiting element 219 is in limit fitting with one side of the movable neutral pole contact 212 away from the static neutral pole contact 211. One end of the reset spring 227 is fitted into a side wall of one side of the guide slot 213 and rotatably connected with The movable neutral pole contact 212, and the movable neutral pole contact point 215 is in contact engaged with a static neutral pole contact point 216 in the static neutral pole contact 211.

[0157] When the phase-pole 14 actuating mechanism of the circuit breaker's phase-pole 1 is activated, the protective actuating rod 225 drives the moving neutral pole contact 212 and the moving contact limiting element 219, sheathed at the other end of the contact actuating rod 2254, so that the triangular guide groove 213 of the moving neutral pole contact 212 engages with the contact guide column 214 and oscillates. Meanwhile, the moving contact limiting element 219 rotates around the contact guide column 214, limiting the rotation of the moving neutral pole contact 212. The moving neutral pole contact 212, in this implementation, features small size, simple structure, and convenient processing and manufacturing, thus reducing production costs and assembly complexity.

[0159] With reference to Figure 21 to Figure 23, the structure of the protective actuating rod 225 of embodiment 1 is the same as that of the protective actuating rod 225 of embodiment 1. One end of the protective actuating rod 225 is articulated to the actuating mechanism of phase pole 14 of the phase pole of the circuit breaker 1 via the shaft-machine coupling actuating rod 220, and the other end of the protective actuating rod 225 is articulated to the movable contact of the neutral pole 212 via the contact actuating rod 2254. When the actuating mechanism of phase pole 14 of the phase pole 1 of the circuit breaker is actuated, the movable contact 212 of the neutral pole is actuated by the protective actuating rod 225.

[0161] As shown in Figure 23, the separator plate 32 is provided with a stop 2250 to limit the protective drive rod 225. The stop 2250 coincides with one end of the protective drive rod 225 near the movable neutral pole contact 212, and the protective drive rod 225 is prevented from having a dead spot through the stop 2250.

[0163] Figure 13 shows a structure of the leak-proof operating mechanism in the embodiment. The leak-proof operating mechanism 22 includes the protection lever 221 pivotally installed on the housing, and the protection jump buckle 222 and protection locking latch 224 pivotally installed on the protection lever 221 respectively and fastened together. The protection jump buckle 222 is connected to the leak-proof handle 31b via the protection connecting rod 223, the protection locking latch 224 is connected to the protection lever 221 via the protection spring 228, and the protection spring 228 is capable of actuating the protection locking latch 224 and the protection jump buckle 222 to close and retain the energy storage. The leakage release 23 of the leakage protection pole 2 is able to unlock the protection locking latch 224 and the protection jump buckle 222 when a leakage fault occurs. An unlocking lever 229 extending to one side of the protection lever 221 is arranged in the operating mechanism of phase pole 14 of the phase pole of circuit breaker 1, and the operating mechanism of phase pole 14 is unlocked via the unlocking lever 229 when the protection locking latch 224 and the protection jump buckle 222 are unlocked.

[0165] Figure 25 shows a structure of the operating mechanism of phase pole 14 of circuit breaker 1 in the embodiment. The operating mechanism of phase pole 14 includes the circuit breaker's energy storage element, the rocker arm 141 pivotally installed in the housing and connected to the moving contact 112, the phase pole support 140 pivotally installed on the rocker arm 141, and the jump buckle 142 and locking latch 143 pivotally installed on the phase pole support 140 respectively and fastened together. The jump buckle 142 is connected to the phase pole handle 31a via the connecting rod 144, and the phase pole support 140 is connected to the housing via the circuit breaker's energy storage element. When the jump buckle 142 and the locking latch 143 of the phase pole drive mechanism 14 are fastened together, the phase pole drive mechanism 14 maintains balance, and the phase pole handle 31a rotates in an on direction, which is able to drive the moving contact 112 to make contact with the static contact 111 through the phase pole drive mechanism 14, and store energy for the energy storage element of the circuit breaker. When the jump buckle 142 and the locking latch 143 are released, the energy storage element releases the energy and actuates the moving contact 112 to separate from the static contact 111. The release lever 229, which is compatible with the leakage operating mechanism of the leakage protection pole 2, is arranged in the locking latch 143. In this embodiment, the phase pole support 140 is connected to the protective drive rod 225 of the leakage protection pole 2 via the shaft-machine coupling drive rod 220, and the locking latch 143 is pivotally installed on the phase pole support 140 via the shaft-machine coupling drive rod 220.

Claims (14)

1. CLAIMS 1. A circuit breaker, comprising a housing, and a circuit breaker phase pole (1) and a leakage protection pole (2) arranged on two sides of the housing side by side, the leakage protection pole (2) comprising a zero-sequence current transformer (21), a leakage operating mechanism (22), and a leakage testing mechanism (25), and a main loop of the circuit breaker phase pole (1) passes through the zero-sequence current transformer (21); The leakage test mechanism (25) comprises an elastic element (26), a test button (29), and a first contact element (27) and a second contact element (28) connected respectively to two ends of a test loop, one end of the elastic element (26) being provided with a first contact portion (261) that coincides with the leakage operating mechanism (22) or a phase pole operating mechanism (14), the other end of the elastic element (26) being provided with a second contact portion (262) that coincides with the test button (29), the test button (29) being capable of pushing the second contact portion (262) to make contact with the second contact element (28); wherein the leakage operating mechanism (22) is capable of pushing the first contact portion (261) to make contact with the first contact element (27) when the circuit breaker is connected, characterized in that the leak-operating mechanism (22) comprises a protective lever (221) pivotally installed in the housing, and a protective release buckle (222) and a protective locking latch (224) pivotally installed on the protective lever (221) respectively and fastened together, the protective release buckle (222) being articulated to one end of a protective connecting rod (223), the other end of the protective connecting rod (223) being articulated to a circuit breaker handle (31), one end of the protective locking latch (224) being arranged in correspondence with a leak-release mechanism (23), the first contact element (27) being arranged to one side of the protective lever (221), the first contact portion (261) of the elastic element (26) extending between the protective lever (221) and the first contact element (27) to coincide with the lever of protection (221), and the elastic element (26) actuates the protection lever (221) so that it rotates more quickly when released. 2. The circuit breaker according to claim 1, wherein the elastic element (26) is a torsion spring, the elastic element (26) comprises a spiral portion (263) connected between the first contact portion (261) and the second contact portion (262), the spiral portion (263) being installed on a spring shaft (260) of the housing, the first contact portion (261) and the second contact portion (262) both being arranged vertically to an axis of the spiral portion (263), the first contact portion (261) extending between the protective lever (221) and the first contact element (27), and the second contact portion (262) extending between the test button (29) and the second contact element (28). 3. The circuit breaker according to claim 2, wherein the first contact element (27) and the second contact element (28) are arranged below the leakage operating mechanism (22), the first contact element (27) is arranged between the second contact element (28) and the elastic element (26), the test button (29) is located on one side of the leakage operating mechanism (22) and above the second contact portion (262), a length of the second contact portion (262) is greater than that of the first contact portion (261), one end of the second contact portion (262) close to the spiral portion (263) coincides with the test button (29), the other end of the second contact portion (262) passes through one side of the first contact element (27) and extends above the second contact element (28), and a test resistor (251) connected to the first contact element (27) is positioned below a place between the first contact element (27) and the elastic element (26). 4. The circuit breaker according to claim 1, wherein a rear face of the guard lever (221) is provided with a first push projection (2211) extending to one side of the first contact portion (261), a side edge of the guard lever (221) is provided with a second push projection (2212) extending to a side face, and a push step face (2213) for limiting the first contact portion (261) is formed between the second push projection (2212) and the first push projection (2211). 5. The circuit breaker according to claim 2, wherein the first contact element (27) comprises a first conductive plate (271) arranged along an axial direction of the spiral portion (263), the elastic element (26) is arranged in an interval with a partition plate (32) between the phase pole of the circuit breaker (1) and the leakage protection pole (2) along the axial direction, one end of the first conductive plate (271) is connected to the partition plate (32), and the other end of the first conductive plate (271) extends to one side of the protection lever (221) along the axis of the spiral portion (263) and is suspended; the first contact element (27) further comprises a second conductive plate (272), one end of the second conductive plate (272) being disposed opposite one end of the first conductive plate (271), one end of the second conductive plate (272) being connected to a side edge of one side of the first conductive plate (271) via a third conductive plate (273) to form a first installation portion with a U-shaped structure, a first installation slot (270) connected to the first installation portion being disposed in the separating plate (32), and the other end of the second conductive plate (272) extending out of the first installation slot (270); and A lateral edge on one side of the first conducting plate (271) near the elastic element (26) is connected to a fourth conducting plate (274), the third conducting plate (273) is connected with a lateral edge on one side of the first conductive plate (271) away from the elastic element (26), so that an opening of the first U-shaped installation portion is oriented towards the elastic element (26), a test resistor (251) is arranged on a side away from the second conductive plate (272) between the elastic element (26) and the first conductive plate (271), one end of the fourth conductive plate (274) is vertically connected to one side of the opening of the first installation portion, the other end of the fourth conductive plate (274) extends to the test resistor (251), and a connection hole (275) is arranged in the fourth conductive plate (274) for connecting the test resistor (251). 6. The circuit breaker according to claim 2, wherein the first contact portion (261) comprises a first contact arm (261a), a second contact arm (261b), and a third contact arm (261c) connected in a U-shape, the first contact arm (261a) and the third contact arm (261c) being positioned opposite each other, the second contact arm (261b) being vertically connected between one end of the first contact arm (261a) and the third contact arm (261c), the other end of the first contact arm (261a) being connected to the spiral portion (263), the other end of the third contact arm (261c) being connected to the fourth contact arm (261d), the fourth contact arm (261d) extending between the test button (29) and the second contact element (28), a spring-loaded limiting slot (261e) for limiting the first contact arm The first contact arm (261a), the second contact arm (261b), and the third contact arm (261c) are arranged in the housing, and the first contact portion (261) is inserted into the spring limiting groove (261e) along one direction of the second contact arm (261b) for limit fitting. 7. The circuit breaker according to claim 1, wherein the phase pole actuating mechanism (14) pushes the first contact portion (261) into contact with the first contact element (27) when the circuit breaker is switched on, the phase pole of the circuit breaker (1) comprises the phase pole actuating mechanism (14), and a static contact (111) and a movable contact (112) arranged oppositely, and the movable contact (112) is connected to the phase pole actuating mechanism (14); The leakage protection pole (2) comprises a static neutral pole contact (211) and a movable neutral pole contact (212) arranged oppositely in the housing, and the phase pole drive mechanism (14) pushes the first contact portion (261) into contact with the first contact element (27) through a neutral line drive element connected to the movable neutral pole contact (212) when the circuit breaker is switched on. 8. The circuit breaker according to claim 7, wherein the neutral line actuating element comprises a protective actuating rod (225) and a shaft-machine coupling actuating rod (220), one end of the protective actuating rod (225) being connected to the movable contact of the neutral pole (212), and the protective actuating rod (225) being articulated to the phase pole actuating mechanism (14) via the shaft-machine coupling actuating rod (220); The first contact portion (261) of the elastic element (26) coincides with the protective actuating rod (225), the protective actuating rod (225) pushes the first contact portion (261) into contact with the first contact element (27), the movable contact of the neutral pole (212) is connected to one end of a reset spring (227), and the other end of the reset spring (227) is connected to the housing. 9. The circuit breaker according to claim 8, wherein the elastic element (26) is a torsion spring, the elastic element (26) comprises a spiral portion (263) connected between the first contact portion (261) and the second contact portion (262), the spiral portion (263) is encased in a spring shaft (260) and connected to the housing, and the first contact portion (261) and the second contact portion (262) are both arranged vertically to an axis of the spiral portion (263); The second contact element (28) is arranged on one side of the movable contact of the neutral pole (212) near the static contact of the neutral pole (211), the first contact element (27) and the elastic element (26) are arranged on one side of the movable contact of the neutral pole (212) away from the static contact of the neutral pole (211), the movable contact of the neutral pole (212) is connected to the second contact element (28) through the reset spring (227), the second contact portion (262) passes through one side of the movable contact of the neutral pole (212) and then coincides with the second contact element (28), and the first contact element (27) is connected with a test resistor (251) located below the first contact element (27). 10. The circuit breaker according to claim 9, wherein the first contact element (27) and the drive rod of the shaft-machine coupling (220) are arranged oppositely on two sides of the elastic element (26), a V-shaped fourth contact arm (261d) is arranged on the first contact portion (261), one end of the fourth contact arm (261d) is inclined to one side near the drive rod of the shaft-machine coupling (220), and the other end of the fourth contact arm (261d) is inclined to one side near the first contact element (27). 11. The circuit breaker according to claim 7, wherein the phase-actuating mechanism (14) comprises a circuit breaker energy storage element, a rocker arm (141) pivotally installed in the housing and connected to the movable contact (112), a phase pole holder (140) pivotally installed on the rocker arm (141), and a jump buckle (142) and a locking latch (143) pivotally installed on the phase holder (140) respectively and connected to each other, the jump buckle (142) being connected to a phase pole handle (31a) via the connecting rod (144), the phase pole holder (140) being connected to the housing via the energy storage element of the circuit breaker, when the jump buckle (142) and the locking latch (143) of the phase drive mechanism (14) are joined together, the phase drive mechanism (14) maintains balance and the phase pole handle (31a) rotates in the on direction, which is able to drive the moving contact (112) to contact the static contact (111) through the phase pole operating mechanism (14), and store energy for the energy storage element of the circuit breaker; when the jump buckle (142) and the locking latch (143) are released, the energy storage element releases the energy and drives the moving contact (112) to separate from the static contact (111); and an unlocking lever (229) matching the leakage operating mechanism of the leakage protection pole (2) is arranged in the locking latch (143); wherein the phase pole support (140) is connected to a protective drive rod (225) of the leakage protection pole (2) via a shaft-machine coupling drive rod (220). 12. The circuit breaker according to claim 9, wherein the spiral portion (263) is arranged on one side near the test button (29), the first contact portion (261) has a U-shaped structure, the first contact portion (261) comprises a first contact arm (261a), a third contact arm (261c) arranged oppositely, and a second contact arm (261b) vertically connected between one end of the first contact arm (261a) and the second contact arm (261b), the second contact arm (261b) being arranged parallel to an axis of the spiral portion (263), one end of the second contact arm (261b) away from the first contact portion (261a) extending to a plane of oscillation of the protective actuating rod (225), the other end of the first contact arm (261a) being connected to the spiral portion (263), the third contact arm (261c) extends between the protective actuating rod (225) and the second contact element (28), and the third contact arm (261c) and the protective actuating rod (225) are arranged in the same plane. 13. The circuit breaker according to claim 12, wherein the other end of the third contact arm (261c) away from the second contact arm (261b) is connected to a fourth contact arm (261d) having a V-shaped structure, the fourth contact arm (261d) extending between the protective actuating rod (225) and the second contact element (28), a side edge on one side of the fourth contact arm (261d) connected to the second contact arm (261b) is inclined in a direction close to the protective actuating rod (225), a side edge on the other side of the fourth contact arm (261d) is inclined in a direction close to the first contact element (27) to coincide with the first contact element (27), a flexed portion coinciding with the protective actuating rod (225) is formed at a junction of the side edges on the two sides of the fourth contact arm (261d), and the actuating rod protection (225) pushes the flexing portion of the fourth contact arm (261d) to cause the fourth contact arm (261d) to move away from one end of the second contact arm (261b) and the first contact element (27), thereby connecting a second test contact point; one end of the fourth contact arm (261d) coincident with the first contact element (27) is provided with a bent contact arm (261f), the bent contact arm (261f) coincides towards a side away from the first contact element (27), and an arc surface coincident with the first contact element (27) is formed out of the bent contact arm (261f). 14. The circuit breaker according to claim 11, wherein the circuit breaker handle (31) comprises the phase pole handle (31a) and a leakage protection handle (31b), the phase pole handle (31a) being connected to the phase pole operating mechanism (14) of the phase pole of the circuit breaker (1), the leakage protection handle (31b) being connected to the leakage operating mechanism (22) of the leakage protection pole (2), a push block (31c) being arranged on the leakage protection handle (31b), the push block (31c) extending to one side of the phase pole handle (31a) rotating in a connecting direction, when rotating in a disconnecting direction in the event of a leakage current occurring, the leakage protection handle (31b) pushes the phase pole handle (31a) to rotate in the disconnecting direction by means of the push block (31c); and when an overload or short circuit occurs, the phase pole handle (31a) rotates in the disconnection direction, but the leakage protection handle (31b) does not act.