JPS6235213B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application) The present invention relates to an earth leakage or disconnection device having a test circuit.

(Problems with the prior art) In general, this type of earth leakage or disconnection circuit, as shown in Fig. 26, has a zero-phase current transformer in the electric line C connecting the input terminal A for connecting the power supply and the output terminal B for connecting the load. The secondary output of the current transformer D is amplified by the amplifier E to operate the switching element, and the switching element is connected to the input terminal I through the opening/closing mechanism by the armature of the electromagnetic device G controlled by the switching element. When I tripped the circuit contact between the zero-phase current transformer 2 and closed the test circuit switch 2, an unbalanced current was caused to flow through the current-limiting resistor 2 to the zero-phase current transformer 2. .

Therefore, if the above is the case, when the load is connected to the input terminal A and the power supply is connected to the output terminal B, which is the reverse connection, and the switch of the test circuit I is kept closed, the zero-phase current transformation will occur. The secondary output of device D is amplified by amplifier E, the switching element is operated, and the armature of electromagnetic device G passes through the opening/closing mechanism section and disconnects the electrical circuit contact H, but since the connection is reversed, the test circuit cannot be restarted. Even though the current continues to flow in the zero-phase current transformer, the unbalanced current continues to flow in the zero-phase current transformer, so the switching element and the electromagnetic device remain in operation, resulting in a short period of time due to current leakage and miniaturization of the disconnector. Electrical components such as electromagnetic devices or switching elements designed for rated use were sometimes burnt out due to heat generated by the current flowing through them.

Furthermore, in view of the above points, in order to protect electrical components such as the electromagnet device or the switching element from burning out, it is necessary to control the current flowing through the electrical component such as the electromagnet device or the switching element to the operation of the electromagnet device. Some devices were equipped with a switch to shut off the switch, but by providing a switch with a movable contact and a fixed contact in the circuit of electrical components such as the electromagnetic device or the switching element, the switch can be closed reliably. If the contact resistance is not extremely high and the contact resistance is not small, there is a high possibility that the electromagnet device will not operate when an unbalanced current flows in the circuit C, and the electromagnet device will not operate even though the unbalanced current flows in the circuit C. This is not preferable because it is not possible to disconnect the contact point, and it may cause electrical leakage or may not function as a disconnector.

(Object of the present invention) In view of the above points, the present invention opens the closed circuit when the test circuit is closed when the armature is operated, thereby reducing burnout of electrical components such as electromagnetic devices or switching elements. Since there is no need to install a switch to cut off the current flowing to the electromagnet device or switching element, the purpose is to eliminate the risk that the electromagnet device will not operate, and to improve the reliability of current leakage and disconnection functions. It is.

(Embodiment) The present invention will be explained below based on FIG. 1, which shows an embodiment of the present invention. 1 is an input terminal to which a power supply is connected, 2 is an output terminal to which a load is connected, and 3 is an electric circuit, which is an input terminal. 1 and output terminal 2. Reference numeral 4 denotes a zero-phase current transformer in which the electric line 3 is used as a primary winding. 5 is an amplifier which receives the secondary winding of the zero-phase current transformer 4 as an input. The amplifier 5 outputs a signal when the unbalanced current flowing through the electric line 3 exceeds a predetermined value, that is, the sensitivity current. Reference numeral 6 denotes a switching element of a thyristor, which is turned on when a signal is output from the amplifier 5. Note that the switching element 6 may be a transistor. Reference numeral 7 denotes a coil of an electromagnet device, which is connected in series with the switching element 6 and connected to the electric circuit 3. Reference numeral 8 denotes a circuit contact, which is provided between the zero-phase current transformer 4 and the input terminal 1, and is attracted by the excitation of the coil 7, and is pulled out through the opening/closing mechanism. 9 is a test circuit in which a series circuit of a test switch 10, a current limiting resistor 11, and a test winding 12 of a zero-phase current transformer 4 is connected to the electric circuit 3;
In other words, when the test circuit 9 is closed, the circuit contact 8 is closed.
When performing the tripping operation, the test circuit 9 is forcibly opened during the armature operation of the electromagnet device.

To explain this operating state, when a leakage current, that is, an unbalanced current flows in the electric line 3, it is detected by the zero-phase current transformer 4, generates a secondary output, is amplified by the amplifier 5, and is sent to the switching element. Turn on 6 and coil 7
Due to the excitation, the armature of the electromagnet device is attracted and the circuit contact 8 is tripped through the opening/closing mechanism, and the test switch 10 of the test circuit 9 is closed to remove the current from the circuit 3 whose current is limited by the current limiting resistor 11. A current flows through the test winding 12 to test for leakage or disconnection of the lever, and when the armature of this electromagnetic device is operated, the test switch 10 is forcibly opened to open the test circuit 9. let

Furthermore, the overall structure of this earth leakage and disconnector will be explained based on drawings 2 to 19 of the overcurrent prevention type earth leakage and disconnector as an example. The body is composed of a container stand 13 and a lid body 14. Incidentally, as shown in FIG. 4, this table 13 is divided into left and right sections approximately from the center. D in the same figure
-D is the center line, E is the left section, and F is the right section. Both sections E and F have the equipment described below. First, to explain the left partition E, reference numeral 1 is an input terminal installed at the upper end of the device stand 13, and includes a box-shaped terminal fitting 16 equipped with a tightening screw 15, and a box-shaped terminal fitting 16 equipped with the terminal fitting 16 as shown in FIG. It consists of a terminal plate 17 into which one end is inserted as shown in FIG. 19 is terminal board 1
7 is a fixing rivet that fixes it to the holder 13, 20 is the holder 13
This relay terminal is provided at the end opposite to the terminal fitting 16, that is, at the lower end in FIGS. 4 and 6, and is made up of a terminal plate 22 provided with a tightening screw 21. Reference numeral 23 denotes a fixing stud for fixing this terminal plate 22 to the device stand 13. 24 is a movable contact of the circuit contact 8; 25 is a contact plate provided with the movable contact 24 at the free end located at the upper side in FIGS. 4 and 6;
0, these input terminal 1, relay terminal 20,
The contact plates 25 are arranged so as to be vertically aligned as shown in FIG. 26 is a fixing screw that fixes the base end 25a of the contact plate 25 on the instrument stand 13;
The base end 25a of the contact plate 25 is arranged so that the movable contact 24 at the free end has the required opening width between the fixed contact 18 and the movable contact 24 at the free end.
is fixed to an inclined surface 27 of the device stand 13 such that the fixed contact 18 side is higher. In FIGS. 6 and 8, 28 is a return spring for the contact plate 25, and 29 is a bimetal that displaces in response to current flow, and is provided as an overcurrent detection element. One end 29a on the base side is connected to the contact The plate 25 is fixed on the device stand 13 by the fixing screw 26, and the other end 29b, which is a free end and serves as an output part as the overcurrent detection element, is connected to the relay terminal 20 by a braided wire 30. It is connected. Assuming that the above is one pole, connect the required number of poles to the device 13 at regular intervals as shown in Figure 4.
Arrange them horizontally on the left dividing band E. Note that the drawings of the embodiments show a bipolar type. Reference numeral 31 denotes a tilting type handle, which is pivotally supported at the center by a support shaft 32 as shown in FIG.
It is said that In the exploded perspective view of the opening/closing mechanism S shown in FIG. 12, reference numeral 33 denotes a return spring for the handle 31, which is supported by the support shaft 32. As shown in FIG. Further, in the same figure and FIGS. 6 to 8, 34 is a frame body in which the handle 31 and other opening/closing mechanism parts S are housed, and the side plates 3
6 and a bottom plate 36, a handle 31 is located between both side plates 35, and a support shaft 32 is supported. This frame body 34 is located between the two poles in the case of the bipolar type of the embodiment, and is located directly above the center type in the case of the three pole type. 37 is a screw hole provided in the bottom plate 36, and a fixing screw 38 passing through the table 13 is inserted as shown in FIG. Reference numeral 39 denotes partition walls located on both sides of the side plates 35 of the frame body 34, which are formed integrally with the device stand 13 and whose purpose is to separate the two movable contact plates 25 from each other. This partition wall 39 is connected to the contacts 18 and 24.
The contact plate 25 is formed from the fixed contact 18 to the base end 25a of the contact plate 25 in order to prevent the dissimilar poles from being connected due to an arc. In FIGS. 6 to 8 and 12, 40 is an elongated notch provided in both side plates 35 of the frame 34, and 41 is a U-shaped link whose one end 41a is inserted into the cam portion 31b of the handle 31. The other end 41b is inserted into the elongated notch 40. Therefore, when the handle 31 is reversed, the cam portion 31b is vertically reversed with respect to the support shaft 32, and the U-shaped link 41
The other end 41b moves back and forth in the elongated notch 40. The return spring 33 of the handle 31 is connected to one end 3
3a is hooked in a recess provided in the handle 31, and the other end 33b is hooked in a notch in the frame 34, so that the handle 31 is always operated in the opening direction. 42
is a rocking plate located between the both side plates 35, whose center is pivotally supported by the other end 41b of the U-shaped link 41. Therefore, the swing plate 42 is connected to the other end 41b of the link 41.
It accompanies the movement of 43 in FIG. 12 is a hole in the cam portion 31b through which one end 41a of the link 41 passes;
a is a hole in the swing plate 42; 4, 6 to 8, and 12, reference numeral 44 indicates both contact plates 25.
The movable frame is made of an insulating material and has a length extending between the contact plates 25 and presses both contact plates 25 at the same time.
It is located between the movable contact 24 and the spring 28 and moves in the horizontal direction. This movable frame 44 has both bulkheads 39
It slides in a lateral groove 45 formed in the lateral groove 45, and one end is held down by the tip 42a of the swing plate 42. 4
Reference numeral 6 denotes a tripping frame formed in a substantially T-shape, and as shown in FIG. These bimetallic 29
It is located below the other end 29b. A screw 47 is screwed onto the other end 46b of the tripping frame 46, and adjusts the distance between the bimetal 29 and the other end 29b to change the interrupting operation characteristics of the opening/closing mechanism section S. In FIG. 12, 48 is a screw hole, 49 is a receiving stage located approximately in the middle of the tripping frame 46, and the rear end 42b of the swing plate 42.
is placed on the handle when the handle 31 is turned to the on side. 50 is a swing plate 4 provided on the tripping frame 46
This stopper 50 is a stopper on the rear end 42b of 2.
The mounting end 42b is located between the holder 49 and the receiving stage 49, and prevents the rear end 42b of the swing plate 42 from jumping up when the opening/closing mechanism S is opened. 51 is a tripping frame 46
This is an extension bar that extends upwards to deal with electrical leakage, which will be discussed later. That is, the extension bar 51 is pushed down to reverse the tripping frame 46 clockwise in FIG. 7, or the bimetal 29 is displaced to reverse the tripping frame 46 clockwise in FIG. This is intended to cause the opening/closing mechanism section S to perform a cutoff operation in response to both overcurrent and leakage. 52 in FIG. 12 indicates that the trip frame 46 is always in the seventh position.
One end 52a is hooked onto the stepped portion 35b of the lower end 35a of the one side plate 35 of the frame body 34 by a spring that is pressed counterclockwise in the figure, that is, toward the swing plate 42 side, and the other end 52
b is applied to the tripping frame 46 to urge the tripping frame 46 counterclockwise in FIG. The contacts 18, 24, contact plate 25, handle 31, link 41, rocking plate 42, tripping frame 46, etc. constitute a switching mechanism section S as an overcurrent prevention type earth leakage breaker. .

Next, the right dividing band F in FIG. 4 will be explained.
In Figures 2 to 5, reference numeral 2 denotes an output terminal installed at the lower end of the right partition F of the table 13 in the same figure, and has the same structure as the input terminal 1, as shown in Figure 4. Box-shaped terminal fitting 16 provided with a tightening screw 15
, and a terminal plate 17 inserted into this metal fitting 16. Similarly to the input terminal 1, the terminal plate 17 is fixed to the device stand 13 with fixing rivets 19. As shown in FIGS. 4 and 5, a detection line 53 is connected to the output terminal 2 and the relay terminal 20. 4 is an endless annular zero-phase current transformer through which a detection wire 53 is passed and the detection wire 53 is used as a primary winding, and 54 is a hole in which the detection wire 53 of each phase is connected to the secondary side when the detection wires 53 of each phase become unbalanced due to a current leakage. A secondary output is induced. In FIG. 5, 55 is a secondary output lead wire, and 56 is an amplifier device consisting of an amplifier 5 for amplifying the secondary output shown in FIG. Each circuit component is covered with a filler such as epoxy. In addition, numeral 57 in the same figure is an electromagnet device, which consists of a coil 7, a winding frame 58, a yoke 59, and an armature 60 as shown in FIGS. These three parts 4, 56, and 57 are housed in an integrated synthetic resin box 61 as shown in FIGS. It is fixed as a block as shown in Figure 4. That is, as shown in FIGS. 13 and 14, this box 61 has an opening 61a on the side of the device stand 13, and the zero-phase current transformer 4, electromagnet device 67, and amplifier device 56 are all installed through this opening 61a. Fixed. The specific shapes of the parts installed in box 61 are as follows:
This will be explained with reference to FIGS. 3 and 14. The zero-phase current transformer 4 is press-fitted into a circular inner chamber 63 formed by a circular peripheral wall 62 of a box 61 so that the axial direction of the hole 54 is horizontal, and the box 61 is connected to the peripheral wall 62. As shown in FIG. 4, a detection line 53 comes out from a hole 65 that matches the hole 64 of the current transformer 4 on the wall surface 64 on the opposite side of the container stand 13 . Reference numeral 66 denotes an inner chamber that accommodates the electromagnet device 57, 67 an inner chamber that accommodates the amplifier device 56, and a partition wall 68 exists between the two inner chambers 57 and 67. Next, the electromagnet device 57 will be specifically explained based on FIGS. 10 and 11. The yoke 59 has a top plate 69 and a hanging plate 7.
0 and a fixed plate 71 that sits on the table 13 are bent and formed integrally from this hanging plate 70. 72
is a fixed iron core hanging down from the top plate 69, which is inserted into the winding frame 58 and also serves as a rivet for the winding frame 58. The armature 60 has one end 60a corresponding to the fixed iron core 72, the other end 60b led out from the horizontal hole 73 of the box 61 as shown in FIGS. Extension bar 51 of removal frame 46
correspond to Therefore, when the armature 60 is attracted, the other end 60b hits the extension bar 51. In FIG. 13, reference numeral 74 denotes a narrow neck provided in the middle of this armature 60, and is formed with notches 74a on both sides. The hanging plate 70 of the yoke 59 is provided with a square hole 75 having a wide cut 75a and a narrow inner side 75b, and an elongated protrusion 75c is present on the side of the cut 75a of the square hole 75. After the neck 74 of the amachia 60 is inserted through this cut 75a, the cut 7
Bend the elongated protrusion 75c so as to close the protrusion 5a,
The armature 60 is pivotally supported in the square hole 75. In FIG. 4, FIG. 13, and FIG. 14, 76 is a display button, and one end is a display end 76a, and the other end is a hook piece 76b that engages with and disengages from the cutout step 44a of the movable frame 44 of the opening/closing mechanism section S. There is. Reference numeral 77 denotes a spring, which is fitted into the elongated hole 76c of the display button 76. Reference numeral 78 denotes a mounting portion for the display button 76 formed on the outside of the inner chamber 53 of the surrounding wall 52 of the box 51. The display button 76 is attached to this mounting portion 78 by springing forward with a spring 77. However, the display button 76 of the lever is locked to the other end 60b of the armature 60 at the push-in position by the structure described later, and when the armature 60 is operated, the display button 76 is locked.
is projected to the right in FIG. 14 by the spring force of the spring 77 to display an earth leakage indication, and when the handle 31 is operated to drive the movable frame 44 in the closing direction,
The display button 76, which is in the protruding position when the earth leakage is displayed, moves with the movable frame 44 and automatically returns to the pushed-in position. In the figure, reference numeral 95 denotes a stop shaft fitted to the display button 76 to prevent it from coming off. Also, Figures 10, 11 and 13
In the figure, a bent portion 79 is formed on the hanging plate 70 of the yoke 19, and a coil spring 80 is disposed between the bent portion 79 and the other end 60b of the armature 60.
The armature gear 60 is energized in the clockwise rotation direction in FIG. Reference numeral 81 denotes a screw hole provided in the fixing plate 71 of the yoke 59, into which a screw 82 passing through the holder 13 is screwed together as shown in FIG. 9, thereby fixing the electromagnet device 57 to the holder 13. Wall 6 of box 61
Further, upper and lower depressions 83 and 84 are formed between the electromagnet device 57 and the zero-phase current transformer 4, and 8
5 is the partition wall. Further, on one side of the lower recess 84, as shown in FIG. 4, a long vertical recess 96 extending to the upper recess 83 is arranged, and at one end of the upper recess 83, a mounting portion 78 for the display button 76 is arranged. has been done. Reference numeral 86 denotes a movable contact plate of the test switch 10, which is located in the upper recess 83 as shown in FIG.
The tongue piece 8 of the movable contact plate 86 is inserted into the small hole 83a at the other end of 3.
6a is press-fitted and locked. Reference numeral 87 denotes a fixed contact plate of the test switch 10, which is located in the vertical recess 96, and a tongue piece 87a is press-fitted into a small hole 96a of the vertical recess 96 and locked therein. Therefore, when the movable contact plate 86 is pressed and comes into contact with the fixed contact plate 87, the detection lines 53 become unbalanced, causing the same phenomenon as electric leakage. 11
is a current-limiting resistor, which is located in the lower recess 84 and has one end connected to the fixed contact plate 87 and the other end connected to the test winding 12. Reference numeral 88 denotes a power supply line, which has one end connected to the relay terminal 20 and the other end connected to the tongue piece 86a of the movable contact plate 86 and the amplifier 56. 89 is the other power supply line, one end of which is connected to the other side of the relay terminal 20, and the other end is connected to the amplifier device 5.
6 and also within the amplifier 56 the zero-phase current transformer 4
It is connected to the test winding 12 that passes through the. That is, the test circuit 9 is constituted by the power line 88, the movable contact plate 86, the fixed contact plate 87, the current limiting resistor 11, the test winding 12, and the power line 89. Second
Reference numeral 90 in the figures, FIGS. 3 and 9 is a test button made of synthetic resin, which is located in the hole 91 of the lid 14 and is pressed outward by a spring 92. In addition, test button 90
is provided with a bifurcated leg 90a having a tapered stopper 90b at its tip. This test button 90 corresponds to the movable contact plate 86.

The zero-phase current transformer 4, the electromagnetic device 57, the contact plates 86 and 87 of the test switch 10, etc. constitute the leakage detection section X. Further, the input terminal 1, the circuit contact 8, the contact plate 25, the bimetal 29, the braided wire 30, the relay terminal 9, the detection line 53, and the output terminal 2 constitute the circuit 1. In addition, the above left and right dividing bands E,
F is assumed for the purpose of explanation, and the leakage detection section These are optional and are not limiting in any way.

Next, the operation of the above-mentioned earth leakage breaker to turn on or break the earth leakage will be explained. FIG. 6 shows an open state, with the contacts 18 and 24 of the circuit contact 8 being open. Further, the swing plate 42 is located along with the link 41 on the handle 31 side, that is, on the right side in the figure. When closing the pole from the above state, use the handle 31a of the handle 31 as shown in FIG.
When the handle 31 is reversed upward in the same figure and the handle 31 is rotated counterclockwise in the same figure, the cam portion 31b is accordingly reversed, and the link 41 is attached and the other end 41b of this link 41 becomes an elongated notch. It moves within the section 40 in the direction of the table 13. Therefore, the swinging plate 42 pivotally attached to the other end 41b attempts to move in the direction of the contact plate 25 as a whole, but the rear end 42b first hits the receiving stage 49 of the tripping frame 46;
Therefore, the subsequent movement of the rocking plate 42 is only at the tip 42a, and this tip 42a pushes the movable frame 44 toward the instrument stand 13, and the contact plate 25 also moves toward the instrument stand 1.
It is pushed down in three directions. Therefore, the contact points 18 and 24 come into contact with each other due to the movement of the contact plate 25, and this state is maintained when one end 41a of the link 41 is connected to the handle shaft 3.
This is done by locating it on the lower side of the figure, exceeding 2. Of course, when opening the pole, flip the handle 31a of the handle 31 downward as shown in FIG.
The contact plate 25 is moved by moving the link 41 with one end 41a of the contact plate 25 positioned above the handle shaft 32 in the same figure.
is returned by the spring 28 to open the contacts 13 and 24. Subsequently, when a leakage occurs in the closed state shown in FIG. 8, the detection lines 53 become unbalanced, and the zero-phase current transformer 4 detects this unbalance. Therefore, the secondary output is input to the amplifier 56 and amplified by the amplifier 5, and the switching element 6 is turned on, and the output drives the electromagnet device 57, so that the other end 60b of the armature 60 is connected to the extension bar 51 of the tripping frame 46. It is to hit. As a result, the tripping frame 46 is reversed downward from the state shown in FIG.
9 comes off, and the rear end 42b moves all at once toward the instrument base 13. On the contrary, the tip 42a is attached to the handle 3.
1 side, that is, to the right in the figure, the pressure on the movable frame 44 is released, and the contact plate 25 is returned by the spring 28 and opened. On the other hand, at the same time, the display button 76, which had been locked to the armature 60 by a structure to be described later, is released from its lock due to the operation of the armature 60, and the display button 76 is moved to the lid 14 by the action of the spring 77.
It protrudes from the display window 93 to display an earth leakage indication, and this operation and the on/off operation after the earth leakage is recovered will be described in detail later.

By the way, when an overcurrent flows and the bimetal 29 responds by self-heating, the bimetal 29 is displaced downward in the drawing due to this overcurrent, and the tripping frame 46 at the other end 29b is moved as shown in FIG. 8 in the same manner as described above. Reversed in a clockwise direction, the swing plate 42 moves and the contacts 18,
24 is opened. However, at this time, the earth leakage detection part X does not operate at all, so naturally the
0 is not disengaged from the display button 76, the display button 76 remains in the retracted state, and it is reported that the opening/closing mechanism S has been opened due to an overcurrent. That is, it is possible to clearly distinguish between a case where the opening/closing mechanism S is opened due to overcurrent detection due to the response of the bimetal 29 and a case where the opening/closing mechanism S is opened due to leakage detection due to the response of the earth leakage detection section X.

Next, the structure and operation of the earth leakage display mechanism will be explained.

That is, as shown in FIGS. 13 to 16, the display button 76 attached to the mounting portion 78 while being biased by a spring 77 has a serrated locking portion on the side surface facing the other end 60b of the armature 60. 76d is formed,
This locking portion 76d has a hooking piece 76b side, which becomes the tip when the display button 76 is pressed, formed into an inclined surface 76e, and a surface on the display end 76a side of the display button 76, which is opposite to this inclined surface 76e, is formed into a vertical surface 76f. A gathering hole 94 provided at the other end 60b of the armature 60 is removably engaged with the locking portion 76d. Further, a protrusion 76g is formed on the side surface facing the movable contact plate 86, so that the display button 74 is displayed when the test switch 10 is closed, that is, when the movable contact plate 86 and the fixed contact plate 87 are in contact with each other. The movable end 8 of the movable contact plate 86 when protruding from the display window 93
6b is opened from the fixed contact plate 87.

Next, the earth leakage display operation using the display button 76 will be explained. When a current leak occurs as described above, the electromagnet device 57 is activated and the extension bar 51 of the tripping frame 46 is driven by the armature 60, and the opening/closing mechanism S is opened.At the same time, the display The button 76 also performs a display operation. The earth leakage display operation by this display button 76 will be explained below.
First, a current leakage occurs, and the other end 60b of the armature 60 disengages from the serrated locking portion 76d of the display button 76 and moves toward the tripping frame 46, but at this time, the notch stage of the movable frame 44 is still in place. The display button 76 does not move because the portion 44a is located at the rear and engaged with the hook 76b of the display button 76. But Amachiya 60
The other end 60b hits the tripping frame 46, and the receiving stage 49 of the tripping frame 61 and the lower end 42b of the swinging plate 42 are disengaged, and the upper end 42a of the swinging plate 42 moves against the movable frame 4.
When the pressure of 4 is released, this movable frame 4
4 is pushed to the right in FIGS. 15 and 16 by the contact plate 25, the cutout step 44a of the movable frame 44 moves forward, allowing the display button 76 to move forward, and the display button The display end 76a of 76 is the lid 14
It protrudes from a display window 93 provided in the display window 93, and notifies the user that the current has been cut off due to leakage detection.

Now, after removing the cause of the electric leakage accident, the display end 7 of the display button 76 can be reset manually.
6a, but in this case, as shown in FIG.
The end surface on the right side in the figure b slides, and the sawtooth locking portion 76d then engages with the engagement hole 94 of the other end 60b of the armature 60, and the display button 76 stops at the rear. Further, the display button 76 can be automatically returned to its original state in conjunction with the on/off operation of the handle 31. That is, when the handle 31 is turned on, the movable frame 44 moves rearward via the link 41 and the swing plate 42;
4a is engaged with the hook piece 76b of the display button 76, the display button 7 is moved in response to the backward movement of the movable frame 44.
6 moves backward and stops in the returned state. That is, if you want to return the display button 76 to its original state after an electrical leak has occurred and the display button 76 protrudes from the display window 93 to display the electrical leak, you must manually press the display button 76 directly. However, it is also possible to automatically return the switch in accordance with the on/off operation of the handle 31.

Next, to explain the operation during the test, FIG. 17 shows a state in which the test button 90 is not pressed, the movable contact plate 86 is separated from the fixed contact plate 87 due to its own elasticity, and the test switch 10 is opened. At the same time, the electromagnet device 57 is not working, so the armature is 60.
is not being attracted, and the display button 76 is engaged with the armature 60 and is not displaying any information. Furthermore, in the above state, the test button 90 as shown in FIG. An unbalanced current is generated, the electromagnet device 57 operates, and the armature 60 is attracted.
However, due to the movement of the armature 60, the display button 60 that was engaged with the armature 60 is disengaged, and the display button 7 is disengaged.
6 projects from the display window 93 to display an earth leakage indication, and a movable contact plate 86 is provided by the protrusion 76g of the display button 76.
The movable end 86b is pushed up and separated from the fixed contact plate 87, and the test switch 10 is opened, resulting in the state shown in FIG. 19, and the test circuit 9 is opened. The opening/closing mechanism section S may test only the earth leakage detection section X with the circuit contacts 8 open, or the opening/closing mechanism section S may conduct the test after closing the circuit contacts 8 to detect earth leakage. It may be a test of the detection section X and the opening/closing mechanism section S.

Furthermore, the overall structure of this earth leakage circuit breaker or circuit breaker may not have a current leakage display mechanism as shown in FIGS. 20 to 25, which are diagrams of overcurrent prevention type circuit breaker or circuit breaker as another embodiment. In other words, the opening/closing mechanism S
A projection 98 is provided on one end 44b of the movable frame 44, and the projection 98 is slid onto a mounting portion 99 formed outside the inner chamber 63 of the surrounding wall 62 of the box 61.
5, the movable end 86b of the movable contact plate 86 is pushed up to open the test switch 10 and the test circuit 9. To explain the operation during the test in detail, FIG. 24 shows a state in which the test button 90 is not pressed, the movable contact plate 86 is separated from the fixed contact plate 87 due to its own elasticity, and the test switch 10 is open. At the same time, the electric circuit contact 10 of the opening/closing mechanism section S is closed, and the movable frame 44 and the protrusion 98 are at the lower position in the figure. Furthermore, from the above state, test button 90
When the movable contact plate 86 is brought into contact with the fixed contact plate 87 and the test switch 10 is closed, the test circuit 9 is closed, an unbalanced current is generated in the zero-phase current transformer 4, and the electromagnetic device 57 is activated, causing the aperture 60 is attracted.
Moreover, the movement of the armature 60 causes the opening/closing mechanism S to be tripped and the movable frame 44 to move upward, causing the protrusion 98 to move upward.
As a result, the movable end 86b of the movable contact plate 86 is pushed up and separated from the fixed contact plate 87, and the test switch 10 is opened to enter the state shown in FIG. 25, thereby opening the test circuit 9.

(Effects) As described above, the present invention provides a test switch with a movable contact plate whose movable end is positioned on the opening/closing mechanism side and whose base end is fixedly attached, and a fixed contact plate opposite to the lower part of the movable contact plate. , a vertically movable test button disposed between the fixed contact plate and the base end of the movable contact plate and at the top of the movable contact plate, and an electric path in case of electrical leakage located at the bottom of the movable end of the movable contact plate. Since it is composed of a protrusion linked to the opening/closing mechanism that moves upward in response to the forced opening of the contact and downward in response to the return operation, the contact closes almost simultaneously with the opening of the circuit contact when the test button is operated. Since the movable contact plate is forcibly opened by the protrusion than the fixed contact plate, the load is connected to the input terminal and the power source is connected to the output terminal, which is a reverse connection. When the test circuit is kept closed, no current flows in the test circuit. Since no current flows through the test circuit, the switching element is turned off, which reduces the risk of heat generation and fire damage to electrical components such as the electromagnetic device and the switching element. Since the flowing current is not directly cut off by a switch with a polar contact, there is no fear that the electromagnet device will not operate due to poor contact of the switch, and it is possible to improve the reliability of leakage and disconnection. Since both the test button and the protrusion correspond only to the movable contact plate, the fixed contact plate does not need to be moved, which simplifies the structure of the test switch and saves space. Since both are positioned, forced opening can be performed with almost no effect even if the operation button is operated with various forces.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an embodiment of the current leakage circuit breaker and circuit breaker of the present invention, and Figures 2 to 19 show an embodiment of the structure of the current leakage circuit breaker and circuit breaker of the present invention. is a front view, Fig. 3 is a bottom view, Fig. 4 is a front view with the lid removed, Fig. 5 is a circuit block diagram, Fig. 6 is a sectional view taken along line AA in the open state of Fig. 1, Fig. 7 is a sectional view taken along line B-B in the open state, Fig. 8 is a mechanical diagram of the main parts of the opening/closing mechanism in the closed state, Fig. 9 is a sectional view taken along CC, and Fig. 10 is a sectional view taken along line C-B.
The figure is an enlarged front view of the electromagnet device, Figure 11 is an enlarged bottom view of the same as above, Figure 12 is an enlarged exploded slope view of the opening/closing mechanism section seen from the upper left, and Figure 13 is the earth leakage detection section seen from the upper left. Fig. 14 is a partially exploded perspective view of the earth leakage detection unit as seen from the lower left on the back side, Fig. 15 is an enlarged sectional view showing the display button in a non-displayed state, and Fig. 16 is a view of the display button. Enlarged sectional views showing the displayed state, FIGS. 17 to 19 are G in FIG.
-G cross section, Fig. 17 is an enlarged sectional view showing the open state of the test circuit, Fig. 18 is an enlarged sectional view showing the open state of the test circuit, and Fig. 19 is an enlarged sectional view showing the test circuit in the open state. FIGS. 20 to 25 are enlarged cross-sectional views showing a state in which the circuit is open during operation, and FIGS. A front view with the lid removed, Fig. 22 is an enlarged exploded perspective view of the opening/closing mechanism seen from the upper left, Fig. 23 is an enlarged exploded perspective view of the earth leakage detection part seen from the upper left, and Fig. 24 is the test circuit. FIG. 25 is an enlarged sectional view taken along line GG in FIG. 20 showing an open state of the test circuit, and FIG. 25 is an enlarged sectional view taken along line GG in FIG.
FIG. 26 is a circuit diagram of a conventional earth leakage or disconnection circuit. 1... Input terminal, 2... Output terminal, 3... Electric line, 4... Current transformer, 5... Amplifier, 6... Switching element, 7... Coil, 8... Electric line contact, 9
. . . Test circuit, 57 . . . Electromagnetic device, 60 .

Claims (1)

[Claims] 1. A zero-phase current transformer that detects unbalanced current in the electric circuit, an amplifier that amplifies the secondary output of this current transformer, a switching element that performs switching operation using the output of this amplifier, and a device connected in series with this switching element. An electromagnet device having a coil connected to an electric circuit, an electric circuit contact that is tripped through an opening/closing mechanism section by an armature of the electromagnet device, and a test circuit that generates an unbalanced current in the zero-phase current transformer when a test switch is closed. In the event of an electrical leakage or disconnection, the test switch has a movable contact plate with its movable end located on the opening/closing mechanism side and its base end fixedly attached, and a fixed plate opposite to the lower part of the movable contact plate. a contact plate, a vertically movable test button disposed between the fixed contact plate and the base end of the movable contact plate and at the top of the movable contact plate, and the earth leakage button located at the bottom of the movable end of the movable contact plate. 1. A current leakage and disconnection switch comprising a protrusion interlocked with the opening/closing mechanism that moves upward in response to forced opening of a current circuit contact and downward in response to a return operation.