JPH069421Y2 - Spring operating device for circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a spring operating device for a circuit breaker capable of preventing slow circuit breakage of a circuit breaker caused by a latch erroneous holding hacker during a closing operation.

[Prior Art] A conventional spring operating device for a circuit breaker includes a closing spring means including a closing spring that is stored by a driving force of an electric motor and a plunger rod that is driven by the closing spring, and a plunger rod of the closing spring. A shutoff spring means provided with a shutoff spring that is stored by the biasing force of the makespring transmitted through the shutoff spring and applies an operating force to the circuit breaker; and a main link mechanism that transmits the biasing force of the makespring to the shutoff spring. Composed.

The main link mechanism includes a contact member that is moved by contacting the contact portion of the plunger rod of the closing spring means during the closing operation, and the transmission link that transmits the biasing force of the closing spring to the cutoff spring by the movement of the contact member. The mechanism and a retaining hacker that engages with a part of the transmission link mechanism when the closing operation is completed and retains the stored state of the blocking spring.

[Problems to be Solved by the Invention] In the conventional operating device, when the latch part of the holding hacker or the latch part of the transmission link mechanism is worn out, the holding hacker and transmission link mechanism are A latch error may occur because the latch portion cannot be latched, that is, cannot be engaged. Then, when a latch error occurs, when the operation of the electric motor is started to store the closing spring after the closing operation, the contact member of the transmission link mechanism contacts the contact portion of the plunger rod, and the contact member of the plunger rod moves. Follows the movement and tries to return to the position before the start of the closing operation. Therefore, when a latch error occurs, the stored cutoff spring is gradually released following the movement of the plunger rod, so that there is a problem that a so-called "slow cutoff" state occurs. Slow cutoff must be absolutely avoided in circuit breakers, as it often leads to extremely serious accidents.

An object of the present invention is to make a closing spring means provided with a closing spring that is stored by a driving force of an electric motor and a plunger rod that is driven by the closing spring, and to operate a circuit breaker that is stored by an urging force of the closing spring. A blocking spring means having a blocking spring for applying a force, and an abutting member that is moved by abutting against the contact portion of the plunger rod of the closing spring means during the closing operation are transmitted to the blocking spring. A transmission link mechanism, and a holding hacker that latches a part of the transmission link mechanism when the closing operation is completed to hold the stored state of the breaking spring,
It is an object of the present invention to provide a spring operating device for a circuit breaker, which includes a motor control circuit for controlling the operation of an electric motor, and which can prevent slow disconnection due to a latch error.

[Means for Solving Problems] The present invention detects the latching state of the holding hacker 33 and latches the holding hacker 33 as shown in FIGS. 1 and 2 showing an embodiment thereof. Latch detection means LS3 for outputting a detection signal when not in operation is provided, and the electric motor control circuit is configured to stop the operation of the electric motor M when the detection signal is output from the latch detection means LS3.

[Operation of the Invention] In the present invention, the latch detection means LS3 is provided to detect a latch error between the holding hacker 33 and a part X7 of the transmission link mechanism. Then, the motor control circuit uses the latch detection means LS3.
When a detection signal is output from the motor, the operation of the electric motor M that is operated to store the closing spring 24 is stopped, the movement of the plunger rod 26 is stopped, and the movement of the contact member 10 of the transmission link mechanism is blocked. To do. Therefore, slow interruption of the circuit breaker can be prevented.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, 1 is a frame for fixing an operating device, and 2 is fixed to a supporting portion 1a provided at a substantially central portion of the frame 1. The closing spring means 3 is a link mechanism in which a fixed shaft is fixed to the plane portion 1b of the frame 1, 4 is a blocking spring means fixed to the upper portion of the frame 1, and 5 is one end side of the blocking spring means 4. Is a shock absorber fixed at 6, an auxiliary switch 6 and a trigger mechanism 7 for controlling closing / closing. Reference numeral 8 is an energy storage means for storing the closing spring.

Although not shown in FIG. 1, the frame 1 has a structure for supporting the main element of the operating device between two plate-like frame plates. It should be noted that FIG. 1 shows only one frame plate 1X.

(Structure of closing means) The closing spring means 2 has a storage case including a cylindrical cylinder 21 and a pair of end plates 22 and 23 fixed to both ends of the cylinder 21. Inside the cylinder 21,
A closing spring (compression spring) 24 is stored. One end of the closing spring 24 is fixed to one end plate 22 and the other end is fixed to a piston-shaped spring support plate 25 that slides in the cylinder 21. One end of a plunger rod 26 is fixed to the center of the spring support plate 25 so as to penetrate the spring support plate 25. The plunger rod 26 slidably penetrates through a through hole 23a provided at a substantially central portion of the end plate 23. An end 27a of a pulling link 27 is rotatably fixed to an end of a plunger rod 26 protruding from the spring support plate 25 toward the blocking spring 24. Towing link 27
The other end 27b of the long hole 2 extending in the axial direction of the link 27
7c is provided.

A sliding shaft 81b fixed to one arm portion 81a of the first link 81 forming a part of the energy storage means 8 is slidably fitted in the elongated hole 27c of the towing link 2. There is. In this embodiment, the closing spring means 2 and the energy storing means 8 constitute the closing spring means.

(Structure of Energy Storage Means) The energy storage means 8 includes a first link 81 and a second link 82.
And a drive motor (not shown) and a reduction mechanism 84. The first link 81 is configured such that two arm portions 81a and 81d swing about a fixed shaft 81c, and one end 82a of the second link 82 is attached to the arm portion 81d of the first link 81. The other end 82b is rotatably fixed to the gear 84a of the reduction mechanism 84. The reduction mechanism 84 rotates a gear 84c driven by an electric motor (not shown) to rotate the gear 84a at a predetermined speed. A drive plate 83 that comes into contact with the switch lever of the limit switch LS2 is provided on the side surface of the gear 84a. By appropriately changing the circumferential length of the drive plate 83, the limit switch L
The operation period of S2 is adjusted. When the closing spring 24 is closed, the end portion 27 of the elongated hole 27c of the towing link 27 is closed.
c1 contacts the sliding shaft 81b or comes close to the sliding shaft 81b. Therefore, when the gear 84a rotates counterclockwise in this state, the pulling link 27 is indexed and the closing spring 24 is charged.

(Structure of Guide Mechanism) The plunger rod 26 is provided on the end plate 23 of the closing spring means 2.
A pair of guide plates 9 are fixedly provided for guiding the ends of the sliders 10 and for guiding and holding the slider 10 that contacts the end surface 26b (contact portion) of the plunger rod 26. The pair of guide plates 9 are arranged substantially parallel to each other, and the guide plates 9 are provided with guiding long holes 9a, respectively.
In FIG. 1, the guide plate on the front side of the drawing is omitted. The guide roller 11 which is movably fitted into the elongated hole 9a of the guide plate 9 and rolls in the elongated hole 9a on the distal end portion 26a of the plunger rod 26 and the slider 10.
Is rotatably provided via a support shaft. Therefore, when the closing spring 24 is closed and the plunger rod 26 linearly moves toward the slider 10, the tip portion 26c of the plunger rod 26 is reliably guided toward the slider 10. Two support shafts are provided at the front and rear of the slider 10 in the longitudinal direction, and a total of four guide rollers 11 are provided on these two shafts.

In this embodiment, a guide mechanism is constituted by the pair of guide plates 9, the guide roller 11 and the support shaft. Further, the slider 10 constitutes an abutting member which constitutes a part of the transmission link mechanism of the main link mechanism 32.

(Structure of Blocking Spring Means 4) The blocking spring means 4 has a storage case including a cylindrical cylinder 41 and a pair of end plates fixed to both ends of the cylinder 41. A shutoff spring 44 is provided inside the cylinder 41.
Is stored. The blocking spring 44 is fixed to a piston-shaped spring support plate 45 that slides in the cylinder 41. A fixing metal fitting 46, to which one end of a link 32d of a main link mechanism 32, which will be described later, is rotatably fixed, is fixed to the center of the spring supporting plate 45 so as to penetrate the spring supporting plate 45.

One end of the plunger roller 47 is fitted and fixed to the fixing member 46. And the plunger rod 47 is the bearing 4
The other end of the plunger rod 47 (not shown) extends inside the shock absorber 5 formed of an oil damper.

(Structure of Link Mechanism 3) The link mechanism 3 includes a first link mechanism 30 for controlling the accumulation and closing of the closing spring 24, a second link mechanism 31 for tripping the blocking spring 44, and a closing spring. And a main link mechanism 32 that transmits the biasing force of 24 to the blocking spring.

(Configuration of First Link Mechanism 30) The first link mechanism 30 includes links 30a to 30f and
The first and second hackers 30g and 30h and the movable axis X
1 to X5, fixed axes Y1 to Y4, and a spring Z1. One end of the link 30a is rotatably fixed to the tip 26c of the plunger rod 26 via the movable shaft X1. The link 30b has one end rotatably fixed to a fixed shaft Y1 fixed to the guide plate 9,
And the other end of 30b and one end of the link 30c are movable axis X2.
They are rotatably fixed by each. Link 3
The other end of 0c is rotatably fixed to one end of a link 30d by a movable shaft X3, and the other end of the link 30d is a link 30d.
It is rotatably fixed to f by a fixed shaft Y4. The link 30f is rotatably fixed to the fixed shaft Y4, one end is rotatably fixed to the slider 10, and the other end is engaged with a predetermined member in the trigger mechanism 7. The first hacker 30g is rotatably fixed to the fixed shaft Y2, and a cutout portion 30g1 that engages with the end portion of the link 30c is formed at the end portion thereof. One end of the spring means Z1 is fixed to the fixed shaft Y2 side of the hacker 30g, and one end of the link 30e is rotatably fixed to the cutout portion 30g1 side by the movable shaft X4. The link 30e is rotatably fixed to the second hacker 30h via a movable shaft X5. The second hacker 30h has a substantially semicircular shape, and its center point is rotatably fixed to a fixed shaft Y3 fixed to a frame in the trigger mechanism 7.

Below the hacker 30g of the first link mechanism 30, a limit switch LS1 is provided as a closing state detector that detects the closing state of the closing spring 24 from the movement of the hacker 30g. The limit switch LS1 is a normally-closed contact type switch in which the switch lever is pushed down to open the contact when the hacker 30g is in the illustrated state.

(Configuration of Main Link Mechanism 32) The main link mechanism 32 is configured by the guide plate 9, the slider 10, the links 32a to 32e, the movable shafts X6 to X10, the fixed shafts Y5 and Y6, and the holding hacker 33. To be done. And the slider 10 and the link 3
2a to 32e constitute a transmission link mechanism that transmits the biasing force of the closing spring 24 transmitted through the plunger rod 26 to the cutoff spring 44.

One end of the link 32a is rotatably fixed to the slider 10 by a movable shaft X6 provided on the slider 10, and the other end is rotatably fixed to the link 32b and the link 32e via the movable shaft X7. Has been done. In the illustrated state, the movable shaft X7 is engaged with a notch (latch) 33a provided at one end of the holding hacker 33. The holding hacker 33 is rotatably fixed to the fixed shaft Y6, and one end of the spring means Z2 is fixed to the end portion. The spring means Z2 urges the holding hacker 33 so that the cutout portion 32a of the holding hacker 33 contacts the movable shaft X7 (latch portion). In the illustrated state, the holding hacker 33 blocks the rotation of the link 32a and holds the energy storage state of the blocking spring 44.

The other end of the link 32b is rotatably fixed to one arm portion 32c1 of the V-shaped link 32c via the movable shaft X8, and the link 32c is fixed to the fixed shaft Y5. The fixed shaft Y5 is rotatably fixed to the frame 1, and the circuit breaker 1 is attached to the fixed shaft Y5.
The operating rod 112 connected to the movable electrode 111 of 10 is connected via a connecting rod (not shown). The connecting rod and the operating rod 112 are configured such that the movable electrode 111 separates from the fixed electrode 113 when the fixed shaft Y5 rotates clockwise in the illustrated state. One end of a link 32d is rotatably fixed to the other arm portion 32c2 of the link 32c via a movable shaft X9, and the link 32d penetrates through the end portions of the frame 1 and the breaking spring means 4 to break the breaking spring means 4. It extends into the cylinder 41 and is rotatably fixed to a fixing member 46 via a movable shaft X10.

The notch portion 33 of the holding hacker 33 is detected near the tip of the holding hacker 33 by detecting the latch state of the holding hacker.
The contact is opened when a is not engaged or latched with the movable shaft X7 of the transmission link mechanism (when the movable shaft X7 contacts one side 33b of the holding hacker 33 and lifts the holding hacker 33). A limit switch LS3 for outputting a latch detection signal indicating that the latch is not performed is provided in the electric motor control circuit described later. As illustrated, the limit switch LS3 is in a latched state due to the notch 33a of the holding hacker 33 engaging with the movable shaft X7, and the holding hacker 33 closes the contact and latches when the switch lever is pushed down. Is not performed and the holding hacker 33 is a type limit switch that opens contacts when the holding hacker 33 is separated from the switch lever.

(Configuration of Second Link Mechanism 31) The second link mechanism 31 includes links 31a to 31f, movable axes X11 to X15, and fixed axes Y7 to Y.
10 and fourth and fifth hackers 31g and 31h. One end of the link 31a is rotatably fixed to a fixed shaft Y7 fixed to the frame 1.
The other end of the link is rotatably fixed to the other end of the link 32e of the main link mechanism 32 and one end of the link 31b via a movable shaft x11. The other end of the link 31b is rotatably fixed to one ends of the link 31c and the link 31d via a movable shaft X12.

The other end of the link 31d is rotatably fixed to a fixed shaft Y9 fixed to the frame 1. The other end of the link 31c is rotatably fixed to a fourth hacker 31g rotatably fixed to a fixed shaft Y8 fixed to the frame 1 via a movable shaft X13. The fourth hacker 31g has a cutout portion 31g1 that engages with one end of the link 31e. Notch 31 of the fourth hacker 31g
One end of the link 31e engaged with g1 is rotatably fixed to the link 31f via the movable shaft X14, and the other end is rotatably fixed to the fixed shaft Y9. The other end of the link 31f is rotatably fixed to a fifth hacker 31h having a substantially semicircular shape via a movable shaft X15. The fifth hacker 31h is rotatably fixed to a fixed shaft Y10 whose center point is fixed to the frame in the trigger mechanism 7, and engages with the trip lock pin 7b of the trigger mechanism 7 in the state shown in the drawing. is doing.

(Electric Motor Control Circuit) FIG. 2 shows an example of an electric motor control circuit for controlling the operation of an electric motor not shown in FIG. In the figure, NFB is a circuit breaker for separating the DC power supply from the control circuit, M is a DC motor, MC is an electromagnetic coil,
S0 is a normally open contact that closes when the electromagnetic coil MC is excited. In this embodiment, the operation control of the electric motor M is performed by the electromagnetic coil M.
This is done by controlling the energization of C. S1, S2, and S3 are contacts of limit switches LS1, LS2, and LS3, respectively. These limit switches LS1
The contacts S1 and S2 of LS2 and LS2 are normally closed contacts that open when the switch lever is operated, that is, open when the switch lever is pushed down. The contact S3 is a normally open contact that closes the contact when the switch lever is operated, that is, closes the contact while the switch lever is pushed down. In this embodiment, the contacts S1 and S2 are connected in parallel, and the contact S3 is connected in series to the parallel circuit of the contacts S1 and S2.

Note that the contacts S1 and S2 are connected in parallel in order to return the link 81 to the position shown in FIG. 1 after the completion of the energy storage of the closing spring 24 so that the link 81 of the energy storage mechanism 8 does not obstruct the closing. Is.

(Operation) FIGS. 3A to 3C schematically show the operation of the embodiment shown in FIG. FIG. 3 (A) shows that when the trip lock pin 7b is rotated based on a command from the trigger mechanism 7 in the state of FIG. The state in which the engagement with the hacker 31h is released and the blocking spring 44 is released, that is, the released state is shown. At this time, since the latch between the holding hacker 33 and the axis X7 is released, the holding hacker 33 pushes down the limit switch LS3 (not shown). Therefore, the contact S3 is in the closed state. At this time, the contacts of the limit switches LS1 and LS2 are open.

FIG. 3 (B) shows a state in which the tripping is completely completed. The biasing force of the blocking spring 44 is transmitted to the link 32b, the link 32e, and the link 32a as the release of the blocking spring 44 progresses, but the slider 10 has a force to prevent sliding. Since the slider 10 does not exist, the slider 10 slides toward the tip portion 26a of the plunger rod 26. As the slider 10 slides toward the plunger rod 26, as shown in FIG.
The connection point (movable axis X7) between the link 32e and the link 32e also moves to the plunger rod 26 side, and as a result, the link 31a is pulled by the link 32e and starts rotating counterclockwise about the fixed axis Y7.

Sliding length of slider 10 and links 32b and 32
The length of e is the length of the link 31a when the end surface 10a of the slider 10 is in contact with the end surface 26d of the plunger rod 26.
Is set to return to the same position as before the release of the breaking spring 44 is started. Therefore, as shown in FIG. 3B, the end face 10a of the slider 10 and the plunger rod 2 are
At the stage where the end surface 26d of the No. 6 is in contact with the end surface 26d of the No. 6, the second link mechanism 31 performs the same operation as the previous operation and the same state as before the breaking spring 44 is released (state of FIG. 1). ) Return to.
In this state, the contacts S1 and S2 of the limit switch shown in FIG. 1 are open and the contact S3 is closed.

In the state of FIG. 3 (B), when the closing command signal is input to the trigger mechanism 7 and the engagement of the closing lock pin 7a and the hacker 30h is released, the closing state shown in FIG. 3 (C) is obtained. Become.
The hacker 30h rotates counterclockwise by a predetermined angle, the link 30e is pulled down, and the hacker 30g is pulled down. When the hacker 30g goes down, the engagement between the cutout portion 30g1 of the hacker 30g and the link 30c is released, and the movable shaft X3 becomes free.
c and 30d bend around the axis X3, and the closing operation of the closing spring 24 is started. When the movable shaft X3 becomes free, the plunger rod 26 instantaneously moves linearly in the direction of the arrow shown by the biasing force of the closing spring 24.

When the slider 10 is biased by the plunger rod 26 and starts moving, the link 32e rotates clockwise around the movable axis X11 because the second link mechanism 31 is fixed. As a result, the link 32b moves upward, the link 32c rotates counterclockwise by a predetermined angle, the link 32d moves leftward, and the blocking spring 44 stores energy.

In the process of closing the closing spring 24, the movable shaft X7 moves while contacting one side 33b of the holding hacker 33,
The holding hacker 33 is once lifted up. Only during this period, the limit switch LS3 is released from the pressing force of the holding hacker 33.

When the closing spring 24 is completely released, the hacker 3
Since 0 g rotates about the fixed axis Y2, the pressing of the switch lever of the limit switch LS1 is released and the contact S1 (FIG. 2) is closed. At this time, if the shaft X7 and the notch 33a of the hacker 33 are securely engaged, the energy storage state of the cutoff spring 44 is maintained. As shown in FIG. 1, the limit switch LS3 has its contact lever S3 kept closed by the switch lever being pushed down by the holding hacker 33, so that the contact S1 in the circuit of FIG.
The contact S3 is closed, an exciting current is supplied to the electromagnetic coil MC, the contact S0 is closed, and the electric current is supplied to the electric motor M to start the electric motor rotation. When the closing spring 24 is closed, the shaft 81b of the link 81 is in a state of being close to one end of the long hole 27c provided in the pulling link 27 as shown in FIG. 3 (C). Therefore, when the electric motor 83 starts rotating and the gear 84a starts rotating counterclockwise, the link 82 rotates around the shaft 84a1 and the link 81 swings around the fixed shaft 81c. As a result, the towing link 27 is pulled in the direction in which the closing spring 24 is energized, and the closing spring 24 is again energized.

When the towing link 27 is towed, the plunger rod 2
6 moves to the closing spring 24 side and the link 30a is pulled in the moving direction of the plunger rod 26,
0c is pulled up. Then, the notch portion 30g1 of the hacker 30g biased upward about the axis Y2 by the spring means Z1 (FIG. 1) engages with the free end portion of the link 30c (FIG. 1). In this state again,
Since the hacker 30h and the locking pin 7a also return to the engaged state, the closing spring 24 is held in the stored state. Then, the switch lever of the limit switch LS1 is pushed again by the hacker 30g, and the contact S1 of the control circuit shown in FIG.
Is opened.

When the electric motor starts rotating and the gear 84a rotates by a predetermined angle to release the contact between the drive plate 83 and the switch lever of the limit switch LS2, the contact S2 is closed. The contact S2 is held in a closed state until the gear 84a makes one rotation and the drive plate 83 again contacts the switch lever of the limit switch LS2. As a result, the shaft 81b of the link 81 moves to the position of the end on the closing spring side of the elongated hole 27c provided in the towing link 27 shown in FIG.

In the closing operation shown in FIG. 3 (C), if the notch 33a of the holding hacker 33 is worn and fails to latch with the shaft X7, the slider 10 is pulled by the subsequent closing operation of the closing spring. It moves to the closing spring side while being in contact with the rod 26. If the energizing operation is continued as it is, the breaking spring 44 is released following the movement of the plunger rod 26, so that the slow breaking occurs.
In this embodiment, a limit switch LS3 is provided as a latch detecting means for detecting the latched state, and a latch error is not detected. The limit switch LS3 outputs a detection signal indicating that the latch is not performed by opening the contact S3.

Immediately after the closing operation is completed, since the plunger rod 26 and the slider 10 are in contact with each other, the holding hacker 33 is in the latched position. Therefore, the contact S3 is in the closed state, and the electromagnetic coil MC is connected via the contacts S1 and S3.
An exciting current is applied to the motor M and the motor M starts rotating. When the electric motor M starts rotating and the plunger rod 26 begins to be pulled, the slider 10 moves and the holding hacker 33 moves upward and separates from the switch lever of the limit switch LS3. As a result, the contact S3 opens and the exciting coil M
The energization of C is stopped, and the operation of the electric motor is stopped.
Therefore, even if a latch error occurs, the slow cutoff can be reliably prevented.

(Modification) Although the contact S3 is inserted in the circuit for exciting the exciting coil MC in the above embodiment, the contact S3 may be arranged in the energizing circuit for the electric motor M. Further, as in the present embodiment, the contact plate S is closed at a time when the contact plate S2 is closed by lengthening the drive plate 83 to some extent.
It is also possible to connect the contact S3 in series with the contact S1 as shown in FIG.

Further, in the above embodiment, the contact of the limit switch LS3 is arranged directly in the electric motor control circuit, but the electric motor control circuit may be indirectly controlled based on the detection signal generated by opening and closing the contact of the limit switch LS3. Of course it is good. The configuration of the electric motor control circuit is not limited to the above embodiment, and various configurations can be used.

Further, in the above embodiment, the limit switch is used as the latch detecting means, but a semiconductor switch for detecting the position of the holding hacker 33 by utilizing a physical change such as light or magnetism may be used as the latch detecting means. Of course.

The main link mechanism 32 may have any other structure as long as it can efficiently transmit the urging force from the closing spring means to the blocking spring 44.

[Advantage of the Invention] According to the present invention, the latch detection means is provided to detect a latch error between the holding hacker and a part of the transmission link mechanism, and the motor control circuit outputs the detection signal from the latch detection means to the motor. Since the operation is stopped, it is possible to prevent the slow break of the circuit breaker.

[Brief description of drawings]

FIG. 1 is a schematic partial sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a circuit diagram showing an example of an electric motor control circuit, FIGS. 3A to 3C are explanatory views for explaining the operation of the operating device shown in FIG. 1, and FIG. 4 is a modification of the electric motor control circuit. It is a circuit diagram which shows an example. 1 ... Frame, 2 ... Closing spring means, 24 ... Closing spring, 2
6 ... Plunger rod, 3 ... Link mechanism, 32 ... Main link mechanism, 4 ... Breaking spring means, 44 ... Breaking spring, 5 ... Shock absorber, 7 ... Trigger mechanism, 8 ... Energy storage means, 9 ... Guide plate, 10 ... Slider, 110 ... Circuit breaker, 33 ... Holding hacker, LS1 and LS2 ... Limit switch, LS3 ...
Limit switch (latch detection means), M ... Electric motor, M
C ... Electromagnetic coil, S1, S2 and S3 ... Contact.

Claims (3)

[Scope of utility model registration request] 1. A closing spring means provided with a closing spring which is stored by a driving force of an electric motor and a plunger rod which is driven by the closing spring; and an operating circuit breaker which is stored by a biasing force of the closing spring. A shut-off spring means provided with a shut-off spring for giving a force; and a contact member which is moved by making contact with the contact portion of the plunger rod of the make-up spring means at the time of make-up operation. A transmission link mechanism for transmitting to the breaking spring, a holding hacker for latching a part of the transmission link mechanism at the completion of the closing operation to hold the stored state of the breaking spring, and a motor control circuit for controlling the operation of the electric motor. A circuit breaker spring operating device comprising: a latch detector that detects a latched state of the holding hacker and outputs a detection signal when the holding hacker is not in the latched state. Means provided, breaker spring operating device, characterized in that the motor control circuit is configured to stop the operation of the electric motor and the detection signal is output. 2. The spring operating device for a circuit breaker according to claim 1, wherein the latch detecting means comprises a limit switch driven by the holding hacker and outputs the detection signal by opening and closing a switching contact. . 3. The open / close contact of the limit switch,
3. The circuit breaker according to claim 2, wherein the limit switch is provided in the electric motor control circuit so as to stop energizing the electric motor when the detection signal is output. Spring operation device.