KR101024708B1 - Molded case circuit breaker - Google Patents

Abstract

The present invention relates to a circuit breaker, the case; A fixed contact fixedly disposed on the case; A movable contact rotatable relative to the stationary contact; And a re-ignition preventing device which maintains an open state during the current-limiting operation of the movable contact and prevents re-ignition. As a result, it is possible to maintain the open state during the current-limiting operation and to prevent re-ignition.

Description

Circuit Breakers {MOLDED CASE CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly, to a circuit breaker that prevents re-ignition after a current-limiting operation so that damage to a contact can be suppressed.

In general, wiring breakers are installed in switchboards, etc., and act as a switchgear that supplies or cuts power to the load side under no load.When a large current exceeding the load current flows when an abnormal phenomenon occurs during load load, In order to protect the wires and load-side equipment, it serves as a circuit breaker that supplies or cuts off the power supplied from the power supply to the load.

1 is a perspective view showing the inside of a conventional circuit breaker, and FIG. 2 is a view for explaining a re-calling process during the current-limiting operation of FIG. 1. As shown in FIG. 1, the circuit breaker includes a case 110 forming an accommodating space therein, a fixed contact 120 fixedly disposed inside the case 110, and a fixed contact 120. The movable contact 130 is disposed so as to be rotatable relative to the movable contact 130.

On one side of the movable contact 130 is a closing position (or trip) where the movable contact 130 is in contact with the fixed contact 120, and the movable contact 130 is separated from the fixed contact 120. Mechanism unit 150 to move to the position) is provided. The mechanism unit 150 may be composed of a plurality of links 152 and springs (not shown).

An operation handle 160 is provided at one side of the mechanism unit 150, that is, the upper region of the case 110 to allow the movable contact 130 to operate at the closing position or the blocking position by a user's manipulation. have. One side of the mechanism part 150 is provided with a trip part (not shown) for tripping the movable contact 130 to be separated from the fixed contact 120 when detecting an accident current such as a short circuit current.

On the other hand, the fixed contact 120 and the movable contact 130 is a so-called current-limiting current when the application of a large current greater than a predetermined current greater than the rated current acts a repulsive force between the two contacts to open (separate) each other to block the current flow It can be formed to implement the operation.

For the current-limiting operation, as shown in FIG. 1, the fixed contact point 120 is operated such that an area in contact with the movable contact point 130 is opposite to the direction of the current and the movable contact point 130. An end contacting the contact 130 is bent.

In addition, the movable contact 130 may be configured to be supported by the shaft 140 to be rotatable to be separated from the fixed contact 120 by the electromagnetic repulsive force at the input position of the operation handle 160. The movable contact 130 is rotated to the closing position and the closing position by the rotation of the shaft 140. The movable contact 130 is elastically pressurized by a contact spring (not shown) to be in contact with the fixed contact point 120 at a feeding position of the shaft 140 with a constant contact pressure.

By the way, in such a conventional circuit breaker, when a large current, such as a short circuit current, is energized at the time of inputting, ie, when the movable contact 130 is in contact with the stationary contact 120, the movable contact 130 is shown in FIG. As described above, the movable contact 130 is rotated to be separated from the fixed contact 120 by the electromagnetic repulsive force acting between the fixed contact 120 and the movable contact 130. In this case, the movable contact 130 is tripped in the state in which the movable contact 130 is rotated in the separation (opening) direction by the electromagnetic repulsive force, so that the movable contact 130 is not rotated to the trip position. ) Is rotated back to the feeding position by the elastic force of the contact spring (not shown). Due to this, there is a problem that an arc is generated (re-ignition) between the fixed contact point 120 and the movable contact point 130 again, causing damage to the contacts 120 and 130 and peripheral components.

Accordingly, an object of the present invention is to provide a circuit breaker that can maintain the open state during the current-limiting operation and prevent re-ignition.

In addition, another object of the present invention is to provide a circuit breaker which can suppress the impact contact between components and extend the life.

In addition, another object of the present invention is to provide a circuit breaker for preventing a re-ignition by maintaining an open state during a current-limiting operation while suppressing an increase in manufacturing cost with a simple configuration.

The present invention, in order to achieve the above object, a case; A fixed contact fixedly disposed on the case; A movable contact rotatable with respect to the fixed contact; And a re-ignition preventing device for preventing re-ignition by maintaining an open state during the current-limiting operation of the movable contact.

Here, the re-call protection device is disposed in a fixed position that is engaged with the movable contact when the rotational axis, the movable contact is inserted, and is disposed in a release position where the engagement with the movable contact is released at the trip position of the movable contact. It may be configured to include a holder for rotating about the rotation axis, and a holder driving portion for rotating the holder to the fixed position or release position.

The movable contact may be supported by a shaft supporting the movable contact in a relative rotatable manner, and the holder driving part may include a lever contacting the shaft to interlock the shaft and the holder.

The anti-recall device may further include a spring that applies an elastic force to the lever such that the lever contacts the shaft.

The holder has a locking projection protruding toward one side and is disposed below the movable contact, and the engaging portion may be formed at the movable contact to engage the locking projection.

The case may be provided with a rotation support portion for supporting the rotation shaft rotatably.

The rotating shaft may be configured of a torsion bar.

The holder may be configured to be rotatable between a retracted position in contact with the movable contact and rotated relative to the pivot shaft, and an engagement position engaged with the engagement portion.

The anti-recall device may further comprise a stopper for limiting the relative rotation range of the holder relative to the rotation axis.

The stopper may include a protrusion protruding from any one of the mutual contact surfaces of the pivot shaft and the holder, and a protrusion accommodating portion formed on the other such that the protrusion may be rotated a predetermined section along the circumferential direction.

The anti-recall device may further include a holder spring for applying an elastic force to the holder to rotate the holder to the engaged position.

The movable contact is supported by a shaft supporting the movable contact to be rotatable, the re-call prevention device, the holder is formed to protrude and withdraw to any one of the contact surface of the movable contact and the shaft, and the holder It may be configured to include a holder driving portion for protruding and withdrawing.

The holder may be disposed on the shaft, and the shaft may be provided with a holder accommodation portion in which the holder protrudes and is retractably received.

A guide portion may be formed at the protruding end of the holder to facilitate contact with the movable contact.

The holder may be configured to protrude at the closing position of the movable contact, to be retracted by the movable contact during the current-limiting operation of the movable contact, and to protrude to suppress rotation of the movable contact in the feeding direction.

The holder driving unit may be composed of a solenoid.

The holder driving unit may be configured to withdraw the holder at the blocking position of the shaft.

As described above, according to one embodiment of the present invention, the movable contact is inserted by the contact spring by providing a re-ignition preventing device that can maintain the open state during the current-limiting operation of the movable contact, thereby preventing re-ignition. It can be prevented from re-burning by re-rotating in the direction. As a result, damage to the contacts and the peripheral parts due to the arc can be suppressed and the service life can be extended.

In addition, by allowing the holder to rotate relative to the rotating shaft of the holder, shock contact between the movable contact and the holder during opening rotation by the current-limiting operation of the movable contact can be suppressed, thereby preventing damage to the holder or the rotating shaft. Thereby, the lifetime of a re-ignition prevention apparatus can be extended.

In addition, by configuring the anti-recall device having a holder protruding and withdrawing the shaft, and a solenoid for retracting the holder, it is possible to rotate the desired contact only by adjusting the mounting position of the holder without changing the size and shape of the holder. Can be fixed accurately at an angle. Moreover, the configuration is simple and can be shared regardless of the capacity of the breaker. Thereby, since it is not necessary to manufacture a holder individually according to the capacity of a breaker, it can suppress that the manufacturing cost of a breaker resulting from individual manufacture rises.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

[First Embodiment]

3 is a perspective view showing the inside of a circuit breaker according to an embodiment of the present invention, FIG. 4 is an enlarged view of a re-ignition preventing device region of FIG. 3, and FIG. 5 is a perspective view of the re-ignition preventing device of FIG. 4. 6 is an exploded perspective view of the re-emergence prevention device of FIG. 4, FIG. 7 is an enlarged view of the case and the pivot support area of FIG. 3, FIG. 8 is a view illustrating a trip state of FIG. 3, and FIG. 9 is a view of FIG. 8 is an enlarged view illustrating main parts, and FIG. 10 is a view for explaining the operation of the current-limiting operation in FIG. 9.

The same reference numerals and the same components as the above-described and illustrated configurations are denoted by the same reference numerals for convenience of description of the drawings, and redundant descriptions thereof will be omitted.

As shown in FIG. 3, the circuit breaker for wiring includes a case 110 forming an accommodating space therein, a fixed contact 120 fixedly disposed inside the case 110, and the fixed contact 120. The movable contact 130 which is disposed to be rotated with respect to the and the re-emergence prevention device 200 to prevent the re-ignition by keeping the movable contact 130 in the open state during the current operation of the movable contact 130 It is configured to include.

One end of the fixed contact 120 is connected to any one of the load or the bus bar, the end contacting the movable contact 130 of the other side is the direction of the current and the movable contact 130 is reversed to generate an electromagnetic repulsion force It is formed to be bent to the one end side.

One end of the movable contact 130 is in contact with and spaced apart from the fixed contact 120, and the other end is connected to the other of the load or the bus.

The movable contact 130 is supported by the shaft 140 so as to allow a current-limiting operation. The movable contact 130 is rotated to the closing position or the blocking position by the shaft 140, and is rotated relative to the shaft 140 during the current-limiting operation. One side of the movable contact 130 is provided with a contact spring (not shown) for applying an elastic force to the movable contact 130 is in contact with the fixed contact 120.

On one side of the movable contact 130, the mechanism 150 for generating the operating force to rotate the movable contact 130 to the closing position (or trip position) and the closing position (or trip position) in contact with the fixed contact 120 Is provided. The operation handle 160 is connected to the mechanism unit 150 to be operated by the user's operation.

On the other hand, the re-call prevention device 200 is disposed in a fixed position that is engaged with the movable contact 130 at the rotational position of the pivot shaft 210, the movable contact 130, the trip of the movable contact 130. The holder 220 rotates about the pivot shaft 210 so that the engagement with the movable contact 130 is released when the position is released, and the holder 220 rotates to the fixed position or the release position. It may be configured to include a holder driving unit 230 to.

The holder 220 may be fixedly coupled to rotate together with the pivot shaft 210. Here, the rotation shaft 210 may be composed of a torsion bar (spring) having elasticity. At one end of the holder 220, a locking step 222 may protrude to be engaged with the movable contact 130.

The holder driving unit 230 may be configured to include a lever 232 to rotate the holder 220 to the fixed position or the release position in conjunction with the shaft 140. The lever 232 is rotatably coupled with the pivot shaft 210. The lever 232 may be coupled to the pivot shaft 210 to be spaced apart from the holder 220 in the axial direction to form a predetermined internal angle.

The lever 232 is positioned in a fixed position where the holder 220 is engaged with the movable contact 130 at the closing position of the shaft 140 to fix the movable contact 130 in an open state. At the tripping position of the shaft 140, the holder 220 is rotated to be positioned at a release position where the engagement with the movable contact 130 is released. Here, the holder driving unit 230 may be composed of an electric motor or a solenoid, not shown.

The holder driving unit 230 may further include a spring 234 that applies an elastic force to allow the lever 232 to contact the shaft 140.

The spring 234 may be composed of a tension coil spring. One side of the holder 220 may be formed with a spring connecting portion 224 to be connected to one end of the spring 234, the other end of the spring 234 is fixed to the case 110 Spring fixing portion 226 may be formed.

Here, the spring 234 may be formed of a compression coil spring to be configured to apply an elastic force so that the lever 232 is in contact with the shaft 140 at one side of the lever 232.

A rotation support part 240 may be formed on the bottom surface 112 of the case 110 to rotatably support the pivot shaft 210. The pivot support 240 may be formed in a pair. The pivot support part 240 may be formed to protrude to a predetermined height from the bottom surface 112 of the case 110. The pivot support portion 240 may be formed with a shaft receiving portion 242 so as to receive and support both ends of the pivot shaft 210.

The bearing portion 242 may be formed so that the upper side is open. As a result, coupling of the pivot shaft 210, the holder 220, and the lever 232 may be facilitated. The rotation support part 240 may be integrally formed with a rotation suppressing part 244 which is in contact with the movable contact 130 to suppress the rotation of the movable contact 130. Correspondingly, contact portions 136 may be formed on both side surfaces of the movable contact 130 to be in contact with the rotation suppressing portion 244.

One end of the movable contact 130, that is, the bottom of the opposite side end of the end in contact with the fixed contact 120 of the movable contact 130 may be engaged with the engaging jaw 222 of the holder 220. An engagement portion 132 may be formed. A periphery of the engaging portion 132 is formed with a receiving space 134 cut to accommodate a portion of the locking jaw 222.

Due to this configuration, the lever 232 in the blocking position (or trip position) of the shaft 140 is counterclockwise in the drawing (ccw) by the spring 234, as shown in Figs. Rotate in contact with the shaft 140. At this time, the holder 220 is located in the release position inclined to the left in the drawing.

When the operation handle 160 is moved to the input position, the shaft 140 is rotated to the input position by the mechanism unit 150, as shown in Figs. As a result, the movable contact 130 rotates in a counterclockwise direction in contact with the fixed contact 120. At the same time, the lever 232 is pressed by the protrusion 142 of the shaft 140 is rotated in the clockwise direction (cw) in the drawing about the pivot shaft 210, the holder 220 is It rotates clockwise about the rotation shaft 210, and it is located in a fixed position in the substantially vertical direction on drawing.

On the other hand, when a large current is energized by an accident current or the like, the movable contact 130 rotates relative to the shaft 140 in the clockwise direction by the electromagnetic repulsive force between the two contacts. At this time, the movable contact 130 is rotated while contacting the upper end of the engaging jaw 222 of the holder 220, the holder 220 pressed by the movable contact 130 is pushed counterclockwise and itself Return to the initial position with the elastic force of.

Accordingly, the holder 220 is engaged with the engaging portion 132 of the movable contact 130, as shown in Figure 10, the engaging jaw 222. As a result, the movable contact 130 is prevented from being rotated in the feeding position direction, thereby maintaining the open state, thereby preventing re-ignition due to re-entry due to the repulsive force of the contact spring.

On the other hand, when the mechanism unit 150 performs a trip operation by a trip unit (not shown), the shaft 140 is rotated to a trip position, as shown in FIG. 9, and the lever 232 is an elastic force of the spring. By rotating in a counterclockwise direction by rotating the holder 220 in a counterclockwise direction so that the engagement with the engaging portion 132 of the movable contact 130 is released.

[Second Embodiment]

11 is a perspective view of a re-ignition preventing device area of a circuit breaker according to another exemplary embodiment of the present invention, and FIG. 12 is a cross-sectional view taken along the line II-XIII of FIG. 11.

The circuit breaker for the wiring 110 includes a case 110, a fixed contact 120 and a movable contact 130 formed to be in contact with and separated from each other and perform a current-limiting operation, and when the current-limiting operation of the movable contact 130 is performed. It is configured to include a re-call prevention device 250 to maintain the open state of the movable contact 130 to prevent re-ignition.

The re-ignition preventing device 250, the rotating shaft 210, the holder 220 is coupled to be rotated relative to the rotating shaft 210, the holder 220 is the movable contact 130 and It may be configured to include a holder driving unit 260 for rotating between the fixed position to be engaged and the release position to be released. Here, the pivot shaft 210 is rotatably supported by the pivot support 240.

The holder driving unit 260 is pivotally coupled integrally with the pivot shaft 210 so that the holder 220 rotates to a release position where the holder 220 is engaged with the movable contact 130 and releases the engagement position. ) And a spring 264 that applies an elastic force to the lever 232 in contact with the shaft 140. The spring 264 may be composed of a compression coil spring. The spring 264 applies an elastic force to rotate the lever 232 in the counterclockwise direction on the drawing. As a result, the lever 232 may be in contact with the shaft 140 to rotate the holder 220 in conjunction with the shaft 140.

A stopper 270 may be provided at the mutual contact area between the pivot shaft 210 and the holder 220 to limit the relative rotation range of the holder 220. The stopper 270 is a protrusion 272 protruding from any one of the pivot shaft 210 and the holder 220, and a protrusion accommodating part 274 formed to accommodate the protrusion 272 on the other. It can be composed of). Here, the protrusion 272 may be formed on the pivot shaft 210, and the protrusion accommodating part 274 may be formed on the holder 220.

Meanwhile, a holder for rotating the holder 220 with respect to the pivot shaft 210 in a direction in which the holder 220 is engaged with the engaging portion 132 of the movable contact 130 on one side of the holder 220. Spring 280 may be provided. As a result, when performing the current-limiting operation of the movable contact 130, it is possible to prevent the shock contact between the movable contact 130 and the holder 220.

By such a configuration, when a large current such as an accident current is energized at the input position of the movable contact 130, the movable contact 130 is rotated to be separated from the fixed contact 120 by the action of the electron repulsive force. At this time, the bottom of the engaging portion 132 of the movable contact 130 is in contact with the upper end of the locking jaw 222 of the holder 220 to press the holder 220. As a result, the holder 220 is pushed in a counterclockwise direction, and when the engaging portion 132 of the movable contact 130 passes, the holder 220 is initialized by an elastic force of the holder spring 280, In other words, the movable contact 130 is maintained in the open state by returning to the fixed position and engaging the engaging jaw 222 and the engaging portion 132. As a result, the movable contact 130 is prevented from being re-injected due to the repulsive force of the contact spring, and the re-ignition due to the re-entry is suppressed.

[Third Embodiment]

FIG. 13 is a perspective view of a re-ignition preventing device area of a circuit breaker according to still another exemplary embodiment of the present invention, FIG. 14 is a cross-sectional view taken along the line XIV-XIV of FIG. 13, and FIG. It is a cross section.

As shown in FIG. 13, the circuit breaker for wiring includes a case 110, a fixed contact 120 and a movable contact 130 formed to be in contact with and separated from each other and perform a current-limiting operation, and the movable contact ( It is configured to include a re-ignition prevention device 300 to maintain the open state of the movable contact 130 when performing the current-limiting operation of 130) to prevent re-ignition.

The anti-recall device 300, the holder 310 is disposed to protrude and withdraw to any one of the mutual contact surface of the shaft 140 and the movable contact 130, and a holder driving portion for retracting the holder 310 ( 320).

As shown in FIG. 13, the holder 310 may be disposed to protrude and retract from the shaft 140. A holder accommodating part 305 may be formed through the shaft 140 to accommodate the holder 310. The holder accommodating part 305 may be formed at a position where the movable contact 130 may be fixed and maintained in a state in which the current is rotated to allow the current current during the current-limiting operation of the movable contact 130. As a result, the holder 310 is pressed by the movable contact 130 which rotates by the electromagnetic repulsive force during the current-limiting operation, is withdrawn into the holder accommodating part 305, and protrudes when the movable contact 130 passes. The movable contact 130 is suppressed from rotating in the input position direction.

The holder 310 may be slidably accommodated in the holder accommodating part 305, and an end thereof may be installed to protrude from the surface of the shaft 140 toward the movable contact 130. Guide portion 312 may be formed at the exposed end of the holder 310 to be easily withdrawn by the movable contact 130 during the current-limiting operation of the movable contact 130. The guide part 312 may be formed in a straight line or a curve. Here, the holder 310 may be configured to be disposed on the movable contact 130. At this time, when the shaft 140 is rotated by a predetermined angle by the current-limiting operation of the movable contact 130, a locking step (not shown) may be formed so that the holder 310 is protruded and engaged and fixed. have.

On the other hand, the holder driving unit 320 may be configured using the solenoid 320 as a power source. As a result, the holder 310 may protrude at the closing position of the movable contact 130, and the holder 310 may be withdrawn at the blocking (or trip) position of the shaft 140. Here, the holder driving unit 320 may be configured using a thermal actuator or an electric motor as the power source.

As shown in FIG. 14, the solenoid 320 includes a coil 323 for generating a magnetic force when power is applied, a fixed core 325 fixedly disposed inside the coil 323, and the fixed core ( A movable core 327 disposed on one side of the 325 so as to be linearly movable, a frame 329 disposed around the coil 323 to form a path, and the movable core 327 It may be provided with a spring 331 for applying an elastic force spaced apart from the fixed core 325. The coil 323 may be wound around a bobbin 321. The frame 329 is disposed around the coil 323 to form a gyro together with the fixed core 325 and the movable core 327.

The holder 310 may be configured to be connected to the movable core 327. As a result, the holder 310 may protrude and withdraw in association with the operation of the movable core 327. The holder 310 and the movable core 327 may be configured to be screwed.

More specifically, the holder 310 protrudes by the movable core 327 spaced apart from the fixed core 325 by the elastic force of the spring 331, when the power is applied to the coil 323 By moving 327 toward the fixing core 325, the 327 may be withdrawn into the holder accommodating part 305 of the shaft 140.

In this configuration, when the operation handle 160 is moved to the input position, the shaft 140 is rotated to the input position by the mechanism unit 150, and the movable contact 130 is rotated to the input position to fix the fixed contact point. Contact with 120.

On the other hand, when a large current such as an accident current is energized between the movable contact 130 and the fixed contact 120, the movable contact 130 is rotated to be separated from the fixed contact 120 by the electromagnetic repulsive force. As the movable contact 130 rotates, the movable contact 130 and the holder 310 come into contact with each other, and the holder 310 is pressed by the movable contact 130 to be retracted into the holder accommodating part 305. do. At this time, the spring 331 of the solenoid 320 is compressed to accumulate the elastic force, whereby the holder 310 is elastic to the movable contact 130 in a state in which it is pressed by the movable contact 130 and withdrawn Contact with. When the movable contact 130 continues to rotate and passes through the holder 310, the holder 310 protrudes by the elastic force of the spring 331.

When the movable contact 130 is rotated by a predetermined angle or more, the movable contact 130 is rotated again by the elastic force of the contact spring (not shown). In this case, as shown in FIG. 15, the protrusion protruding from the shaft 140 In contact with the holder 310, the rotation is suppressed to maintain the open state. This prevents re-calling due to rotation of the movable contact 130 to the input position.

On the other hand, when the shaft 140 is rotated to the trip position by a trip unit (not shown), power is applied to the coil 323 of the solenoid 320 by a control unit (not shown). When power is applied to the coil 323, the movable core 327 is moved toward the fixed core 325, and the holder 310 is withdrawn into the holder accommodating part 305. As a result, the movable contact 130 is released into engagement with the holder 310 and becomes rotatable to the input position.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential features thereof, so the embodiments described above should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

1 is a perspective view showing the inside of a conventional circuit breaker;

2 is a view for explaining a re-call process during the current-limiting operation of FIG.

3 is a perspective view showing the interior of a circuit breaker according to an embodiment of the present invention;

4 is an enlarged view of the re-call prevention device region of FIG. 3;

5 is a perspective view of the re-emission prevention device of FIG.

Figure 6 is an exploded perspective view of the re-emergence prevention device of Figure 4,

7 is an enlarged view of the pivot support area of FIG. 3;

8 is a view illustrating a trip state of FIG. 3;

9 is an enlarged view illustrating main parts of FIG. 8;

10 is a view for explaining the operation of the current-limiting operation of FIG.

11 is a perspective view of a re-ignition preventing device region of a circuit breaker according to another embodiment of the present invention;

12 is a side cross-sectional view of FIG.

13 is a perspective view of a re-ignition preventing device area of a circuit breaker according to still another embodiment of the present invention;

14 is a cross-sectional view taken along the line XIV-XIV of FIG. 13;

15 is a cross-sectional view for explaining the operation of FIG. 13.

Explanation of symbols on the main parts of the drawings

110: case 120: fixed contact

130: movable contact 132: engaging portion

134: accommodation space 140: shaft

150: mechanism 160: operation handle

200: anti-recall device 210: rotating shaft

220: holder 222: locking jaw

230: holder drive portion 232: lever

234: spring 240: rotation support

242: bearing part

Claims (17)

case; A fixed contact fixedly disposed on the case; A movable contact rotatable with respect to the fixed contact; And During the current-limiting operation of the movable contact, the movable contact separated from the fixed contact is prevented from rotating in the direction in which the movable contact is in contact with the fixed contact to maintain the open state of the movable contact, thereby preventing re-ignition. Including; device; The re-call preventing device is disposed in a fixed position that is engaged with the movable contact when the rotational shaft, the movable contact of the movable contact, and the disengagement position to be disposed in the release position to release the engagement with the movable contact at the trip position of the movable contact A holder pivoting about a rotational shaft, and a holder driving portion for rotating the holder to the fixed position or the release position, The holder is provided with a locking projection protruding to one side and is disposed below the movable contact, the movable contact is characterized in that the engaging portion is formed so that the locking projection can be engaged. delete The method of claim 1, And the movable contact is supported by a shaft supporting the movable contact so as to be relatively rotatable, and the holder driving part includes a lever contacting the shaft to interlock the shaft and the holder. The method of claim 3, The anti-recall device further comprises a spring for applying an elastic force to the lever such that the lever in contact with the shaft. delete The method according to any one of claims 1, 3 or 4, The case circuit breaker, characterized in that the rotating support portion for supporting the rotating shaft rotatably formed. The method according to any one of claims 1, 3 or 4, The rotation shaft is a circuit breaker, characterized in that the torsion bar. The method according to any one of claims 1, 3 or 4, And the holder is rotatable between a retracted position in contact with the movable contact and being rotated relative to the pivot shaft, and an engaging position engaged with the engaging portion. The method of claim 8, The re-ignition preventing device further comprises a stopper for limiting the range of rotation relative to the rotation axis of the holder. 10. The method of claim 9, The stopper includes a protrusion protruding from any one of the mutual contact surfaces of the pivot shaft and the holder, and a protrusion receiving portion formed on the other such that the protrusion is rotated a predetermined section along the circumferential direction. . The method of claim 8, The anti-recall device further comprises a holder spring for applying an elastic force to the holder to rotate the holder to the engaged position. case; A fixed contact fixedly disposed on the case; A movable contact rotatable with respect to the fixed contact; And During the current-limiting operation of the movable contact, the movable contact separated from the fixed contact is prevented from rotating in the direction in which the movable contact is in contact with the fixed contact to maintain the open state of the movable contact, thereby preventing re-ignition. Including; device; The movable contact is supported by a shaft supporting the movable contact to be rotatable, the re-call prevention device, the holder is formed to protrude and withdraw to any one of the contact surface of the movable contact and the shaft, and the holder Wiring breaker comprising a holder driving portion for protruding and withdrawing. The method of claim 12, And the holder is disposed on the shaft, and the shaft is provided with a holder accommodating portion in which the holder protrudes and is retractably received. The method of claim 13, Protruding end of the holder, the circuit breaker, characterized in that the guide portion is formed so that the contact with the movable contact is smooth.  The method of claim 12, And the holder protrudes at the closing position of the movable contact, is retracted by the movable contact during the current-limiting operation of the movable contact, and protrudes to suppress rotation of the movable contact in the closing direction.  The method according to any one of claims 12 to 15, And the holder driving part is a solenoid. The method of claim 16, And the holder driving unit retracts the holder at the blocking position of the shaft.

Images