JP7446254B2 - circuit breaker - Google Patents

Description

The present disclosure relates to a circuit breaker including a movable element holder that rotatably holds a plurality of movable conductors arranged in parallel.

Conventionally, in a circuit breaker that requires the ability to close a short circuit, when a short circuit is closed, a large current flows through the movable element the moment a movable contact attached to the movable element contacts a fixed contact. When a large current flows through the movable element, a large Lorentz force is generated in the movable conductor.

In this type of circuit breaker, a technique is known in which a plurality of movable conductors constituting a movable element are arranged in parallel in each phase in order to reduce the Lorentz force generated in the movable conductor through which a large current flows. For example, Patent Document 1 discloses a circuit breaker in which three movable conductors are arranged in parallel in each phase and are rotatably held in a movable element holder.

In the circuit breaker described in Patent Document 1, a spacer is inserted between the movable conductors in order to prevent the movable conductors from tilting due to the Lorentz force generated in the movable conductors when a large current flows between the contacts. Such spacers suppress contact between the movable conductors and reduce friction caused by Lorentz forces.

Japanese Unexamined Patent Publication No. 61-279026

When a large current flows through the movable element, the Lorentz force acting on the movable conductor of the movable element acts not only in the arrangement direction of the movable conductors but also in the rotating direction of the movable conductor. The Lorentz force acting in the rotational direction generates a reaction force in the direction opposite to the direction in which the movable conductor approaches the fixed contact on the movable pin that rotatably holds the movable conductor in the movable element holder. Such reaction force may cause the mover pin to deform in a direction away from the fixed contact. When the movable pin deforms in the direction away from the fixed contact, the contact force between the movable contact and the fixed contact decreases during the closing operation in which the movable contact transitions from a position away from the fixed contact to a position in which it contacts the fixed contact. However, there is a possibility that arcing may occur between the movable contact and the fixed contact, resulting in poor conduction.

The present disclosure has been made in view of the above, and an object of the present disclosure is to obtain a circuit breaker that can suppress a decrease in contact force between a movable contact and a fixed contact during a closing operation.

In order to solve the above-mentioned problems and achieve the objectives, the circuit breaker of the present disclosure includes a mover, a mover holder, and a mover pin receiver. The movable element includes a plurality of movable conductors. The movable element holder rotatably holds a plurality of movable conductors arranged in parallel via a movable element pin extending in the arrangement direction of the plurality of movable conductors. The mover pin receiver is fixed to the mover holder and arranged in parallel with the plurality of movable conductors along the extending direction of the mover pin. The mover pin is held by a mover holder and a mover pin receiver. The movable pin receiver is disposed at a position not adjacent to the movable conductors disposed at both ends in the extending direction among the plurality of movable conductors.

According to the present disclosure, it is possible to suppress a decrease in the contact force between the movable contact and the fixed contact during the closing operation.

A side view of the inside of the circuit breaker according to the first embodiment when it is opened. A side view of the inside of the circuit breaker according to the first embodiment when it is closed. A perspective view showing a state in which the movable element, the movable element holder, and the movable element pin receiver in the circuit breaker according to the first embodiment are assembled. A front view showing an example of a movable element holder in the circuit breaker according to the first embodiment. A perspective view showing an example of a mover pin receiver in the circuit breaker according to the first embodiment. A side view showing an example of a movable conductor in the circuit breaker according to the first embodiment. A side view showing the direction of the Lorentz force acting on the movable conductor when a large current flows between the movable contact and the fixed contact of the circuit breaker according to Embodiment 1. A front view showing the direction of the Lorentz force acting on the movable conductor when a large current flows between the movable contact and the fixed contact of the circuit breaker according to Embodiment 1. A perspective view showing an example of the shape of a protrusion of a movable pin receiver according to a second embodiment. A perspective view showing another example of the shape of the protrusion of the movable pin receiver according to the second embodiment. A front view showing an example of a state in which a movable element holder, a movable element, a movable element pin receiver, and a flexible conductor according to Embodiment 3 are assembled.

Below, a circuit breaker according to an embodiment will be described in detail based on the drawings.

Embodiment 1.
FIG. 1 is a side view of the inside of the circuit breaker according to the first embodiment when the circuit breaker is opened. FIG. 2 is a side view of the inside of the circuit breaker according to the first embodiment when it is closed. In a plurality of drawings including FIGS. 1 and 2, coordinates of the XYZ axes are shown for convenience of explanation. In the case where only a part of the configuration of the circuit breaker is illustrated, each of the X-axis direction, Y-axis direction, and Z-axis direction is the direction when the circuit breaker is assembled. In the following, the Z-axis positive direction may be referred to as upward, and the Z-axis negative direction may be referred to as downward.

A circuit breaker 1 shown in FIG. 1 is an air circuit breaker that opens and closes an electrical circuit such as a low-voltage distribution line, and detects at least one of overcurrent and leakage to interrupt the electrical circuit. This circuit breaker 1 includes a casing 2 formed of an insulating material, a power supply side terminal 3 and a load side terminal 4 attached to the casing 2, and one end connected to the load side terminal 4 inside the casing 2. and a connected flexible conductor 5.

The circuit breaker 1 also includes a movable element 6 whose one end is connected to the other end of the flexible conductor 5, and a movable element holder whose one end is rotatably attached to the casing 2 inside the casing 2. 7, a contact pressure spring 8 whose one end and the other end are attached to the other end of the movable element holder 7 and the other end of the movable element 6, and a movable element fixed to the middle part of the movable element holder 7. A pin receiver 9 is provided.

The power supply side terminal 3 is connected to a power supply side conductor (not shown) outside the housing 2, and the load side terminal 4 is connected to a load side conductor (not shown) outside the housing 2. A fixed contact 10 is attached to the power supply side terminal 3 inside the housing 2, and a movable contact 11 is attached to the other end of the movable element 6.

The flexible conductor 5 is a flexible conductor, and electrically connects the load side terminal 4 and the movable element 6. In the circuit breaker 1 in the open state shown in FIG. 1, the movable contact 11 is not in contact with the fixed contact 10, and the power supply side terminal 3 and the load side terminal 4 of the circuit breaker 1 are not electrically connected. The movable element holder 7 is rotatably attached to the housing 2 at one end with a holder shaft 12 as the center of rotation, and the movable element 6 is rotatably attached to the middle part by a movable element pin 13.

Further, the circuit breaker 1 includes an electromagnetic actuator 20 disposed inside the housing 2 as a closing actuator of the circuit breaker 1, and a driving force of the electromagnetic actuator 20 is transmitted to the movable element 6 to connect the fixed contact of the movable contact 11. 10 and a transmission mechanism 30 that makes contact with and releases from the device 10. The circuit breaker 1 also includes an opening spring 39 whose one end and the other end are attached to the transmission mechanism 30 and the housing 2, and a tripping mechanism 40 that maintains the closed state and releases the closed state. Equipped with.

In the electromagnetic actuator 20, when the exciting coil 21 is energized by a drive circuit (not shown), the shaft 25 moves upward. The transmission mechanism 30 includes a connecting link 31 whose one end is rotatably connected to the shaft 25 of the electromagnetic actuator 20 by a connecting pin 34, and a main shaft rotatably connected to the other end of the connecting link 31 by a connecting pin 35. 32, and a link 33 rotatably connected to one end of the main shaft 32.

The main shaft 32 is attached to the rotating shaft 36 so as to be rotatable about the rotating shaft 36 fixed to the housing 2 . The link 33 has one end rotatably connected to one end of the main shaft 32 by a connecting pin 38, and the other end rotatably attached to the middle part of the movable element holder 7 by a connecting pin 37.

When the electromagnetic actuator 20 is energized while the circuit breaker 1 is in an open state, the shaft 25 of the electromagnetic actuator 20 moves upward in the driving direction. As the shaft 25 moves upward, the main shaft 32 rotates around the rotating shaft 36, and the movable element 6 moves forward by the transmission mechanism 30, and as shown in FIG. 2, the fixed contact 10 and the movable contact 11 and the circuit breaker 1 is brought into a closed state. When the movable contact 11 contacts the fixed contact 10, the power supply side terminal 3 and the load side terminal 4 are electrically connected in the circuit breaker 1.

The circuit breaker 1 is a circuit breaker that opens and closes a three-phase circuit, and includes a power supply side terminal 3, a load side terminal 4, a flexible conductor 5, a mover 6, a mover holder 7, a mover pin receiver 9, and a link. 33 for each phase, and the main shaft 32 rotates to open and close the electric circuit.

FIG. 3 is a perspective view showing a state in which the movable element, the movable element holder, and the movable element pin receiver in the circuit breaker according to the first embodiment are assembled. FIG. 4 is a front view showing an example of a movable element holder in the circuit breaker according to the first embodiment. FIG. 5 is a perspective view showing an example of a movable pin receiver in the circuit breaker according to the first embodiment. FIG. 6 is a side view showing an example of a movable conductor in the circuit breaker according to the first embodiment.

As shown in FIG. 3, the movable element 6 has five movable conductors 60. The movable element holder 7 rotatably holds five movable conductors 60 arranged in parallel via a movable element pin 13 extending in the arrangement direction of the plurality of movable conductors 60. Note that the number of movable conductors 60 is not limited to five, but may be four or more.

As shown in FIG. 4, the movable element holder 7 has a spring mounting hole 7a to which the ends of the plurality of contact pressure springs 8 are attached, and a plurality of pin receivers to which the ends of the plurality of movable element pin receivers 9 are attached. A hole 7b and a plurality of pin attachment holes 7c to which one end and the other end of the movable pin 13 are attached are formed.

Each movable element pin receiver 9 is attached to a mutually different pin receiving hole 7b, and is fixed to the movable element holder 7. Therefore, each movable element pin receiver 9 does not rotate while attached to the movable element holder 7. As shown in FIG. 5, the movable element pin receiver 9 is formed with a through hole 9a through which the movable element pin 13 is inserted.

The mover pin 13 is held by a mover holder 7 and two mover pin receivers 9. Specifically, as shown in FIG. 3, one end and the other end of the mover pin 13 are attached to different pin attachment holes 7c, so that the one end and the other end of the mover pin 13 are connected to each other. It is held by a movable element holder 7.

In addition, as shown in FIG. 3, by inserting the middle part of the mover pin 13 into the through hole 9a formed in each mover pin receiver 9, the middle part of the mover pin 13 is connected to the two movers. It is held by a pin receiver 9. Note that the number of mover pin receivers 9 may be one, or may be three or more.

As shown in FIG. 6, a through hole 60a is formed in each movable conductor 60, and by inserting the movable pin 13 into the through hole 60a, as shown in FIG. The movable element pin 13 is rotatably held by the movable element pin 13 with the rotation axis being the axis of rotation.

As shown in FIGS. 3 and 6, each movable conductor 60 is attached with a movable contact 11a. The movable contacts 11a of the plurality of movable conductors 60 constitute the movable contact 11 shown in FIGS. 1 and 2.

FIG. 7 is a side view showing the direction of the Lorentz force acting on the movable conductor when a large current flows between the movable contact and the fixed contact of the circuit breaker according to the first embodiment. As shown in FIG. 7, when the movable contact 11a attached to the movable conductor 60 contacts the fixed contact 10, a short circuit is closed, and a large current flows, the movable conductor 60 has the movable pin 13. A Lorentz force acts toward the fixed contact 10 in the circumferential direction.

The contact force of the movable contact 11a with respect to the fixed contact 10 increases due to the above-mentioned Lorentz force working together with the pressing force of the contact pressure spring 8. At this time, a reaction force is generated in the movable pin 13 in a direction opposite to that of the fixed contact 10, and this reaction force may cause the movable pin 13 to deform in a direction away from the fixed contact 10. When the movable pin 13 deforms in the direction away from the fixed contact 10, the pressing force of the contact pressure spring 8 decreases, and the contact force between the movable contact 11a and the fixed contact 10 decreases. Therefore, arcing may occur between the movable contact 11a and the fixed contact 10, resulting in poor conduction.

In the circuit breaker 1 according to the first embodiment, as shown in FIG. 3, the movable pin 13 is held by the movable pin receiver 9 which is arranged in parallel with the movable element holder 7 and the plurality of movable conductors 60. Therefore, in the circuit breaker 1, even when the above-mentioned reaction force occurs, the midway portion of the mover pin 13 is held by the mover pin receiver 9, so deformation of the mover pin 13 can be suppressed. As a result, a decrease in the contact force between the movable contact 11a and the fixed contact 10 can be suppressed.

Furthermore, since the circuit breaker 1 is provided with the movable pin receiver 9 that supports the midway portion of the movable pin 13, the number of points supporting the movable pin 13 increases. Therefore, the stress generated in the portion of the movable element holder 7 supporting the movable element pin 13 can be reduced.

FIG. 8 is a front view showing the direction of the Lorentz force acting on the movable conductor when a large current flows between the movable contact and the fixed contact of the circuit breaker according to the first embodiment. As shown in FIG. 8 , a Lorentz force acts on the plurality of movable conductors 60 toward the movable conductor 60 at the center of the plurality of movable conductors 60 in the extending direction of the mover pin 13 .

This Lorentz force acts as a force that presses each of the plurality of movable conductors 60 against an adjacent member. A member adjacent to each movable conductor 60 is the movable element holder 7, the movable element pin receiver 9, or the movable conductor 60, and hereinafter may be simply referred to as an adjacent member. Further, in the following, among the plurality of movable conductors 60, the movable conductor 60 at the center in the extending direction of the mover pin 13 is simply referred to as the central movable conductor 60, The movable conductor 60 at the end may be simply referred to as the movable conductor 60 at the end.

The force that presses the movable conductor 60 against the adjacent member becomes a normal force and generates a frictional torque between the movable conductor 60 and the adjacent member. Therefore, the contact force of the movable contact 11a with respect to the fixed contact 10 is reduced.

Further, the Lorentz force directed toward the fixed contact 10 in the circumferential direction of the movable pin 13 shown in FIG. 8 is larger as the movable conductor 60 is located at the center, and becomes smaller as the movable conductor 60 is closer to the ends. That is, among the plurality of movable conductors 60, the contact force of the movable contact 11a with respect to the fixed contact 10 is greater as the movable conductor 60 is at the center in the extending direction of the movable pin 13, and is smaller as the movable conductor 60 is at the end. Therefore, when the above-mentioned frictional torque is generated, the movable contact 11a of the movable conductor 60 at the end is more likely to arc.

Furthermore, the Lorentz force acting in the left-right direction in FIG. 8 is smaller as the movable conductor 60 is located at the center, and becomes larger as the movable conductor 60 is located closer to the ends. Therefore, the friction torque generated in the movable conductor 60 is smaller as the movable conductor 60 is in the center and larger as the movable conductor 60 is at the ends, so that the movable contact 11a of the movable conductor 60 at the end is more likely to fire.

Therefore, in the circuit breaker 1 according to the first embodiment, as shown in FIG. placed in non-contiguous positions. In the example shown in FIG. 8, the movable pin receiver 9 is arranged at a position adjacent to the movable conductors 60 other than the end movable conductor 60 among the plurality of movable conductors 60, and the end movable conductor 60 It is arranged between the mover holder 7 and the mover holder 7.

Therefore, when a pressing force acts on the movable conductors 60 at both ends among the plurality of movable conductors 60, one surface of the movable conductor 60 at the end in the extending direction of the movable element pin 13 comes into contact with the adjacent movable element holder 7, The other surface may contact the adjacent movable conductor 60.

Although friction torque is generated on the contact surface of the movable conductor 60 with the movable element holder 7, the friction torque generated on the contact surface with the movable conductor 60 that moves in the same direction cancels each other out. Alternatively, compared to the case where the movable pin receivers 9 are adjacent to each other, a decrease in the contact force of the movable contact 11a with respect to the fixed contact 10 can be suppressed.

In addition, in the movable conductor 60 adjacent to the movable pin receiver 9, although the contact force of the movable contact 11a with respect to the fixed contact 10 is reduced due to contact with the movable element pin receiver 9, compared to the movable conductors 60 at both ends, the movable contact 11a Since the contact force against the fixed contact 10 is large, the necessary contact force can be maintained.

As described above, the circuit breaker 1 according to the first embodiment includes the mover 6, the mover holder 7, and the mover pin receiver 9. The movable element 6 includes a plurality of movable conductors 60. The movable element holder 7 rotatably holds a plurality of movable conductors 60 arranged in parallel via a movable element pin 13 extending in the arrangement direction of the plurality of movable conductors 60. The movable element pin receiver 9 is fixed to the movable element holder 7 and is arranged in parallel with the plurality of movable conductors 60 along the extending direction of the movable element pin 13. The mover pin 13 is held by the mover holder 7 and the mover pin receiver 9. The movable pin receiver 9 is disposed at a position not adjacent to the movable conductors 60 disposed at both ends in the extending direction among the plurality of movable conductors 60. Thereby, the circuit breaker 1 can suppress a decrease in the contact force between the movable contact 11 and the fixed contact 10 during the closing operation.

Embodiment 2.
The circuit breaker according to the second embodiment differs from the circuit breaker according to the first embodiment in that a protrusion is formed on the movable pin receiver. In the following, components having the same functions as those in Embodiment 1 will be denoted by the same reference numerals and explanations will be omitted, and differences from the circuit breaker in Embodiment 1 will be mainly explained.

FIG. 9 is a perspective view showing an example of the shape of the protrusion of the movable pin receiver according to the second embodiment. FIG. 10 is a perspective view showing another example of the shape of the protrusion of the movable pin receiver according to the second embodiment. The circuit breaker according to the second embodiment is the same as the circuit breaker 1 according to the first embodiment except that the shape of the movable pin receiver is different.

As shown in FIGS. 9 and 10, the movable pin receiver 9A according to the second embodiment has a protrusion 9b on at least one surface in the extending direction of the movable pin 13, and the protrusion 9b is movable. This differs from the movable element pin receiver 9 according to the first embodiment in that it is arranged around a through hole 9a through which the child pin 13 is inserted. The protrusion 9b arranged around the through hole 9a is arranged around the movable pin 13 in a state where the movable pin receiver 9A holds the movable pin 13.

In the example shown in FIG. 9, the protrusions 9b are formed in a cylindrical shape, and a plurality of protrusions 9b are arranged around the through hole 9a at intervals along the circumferential direction of the through hole 9a with the through hole 9a as the center. . Further, in the example shown in FIG. 10, the protrusion 9b is formed in an annular shape around the through hole 9a in the circumferential direction of the through hole 9a with the through hole 9a as the center. In this way, the protrusion 9b is formed around the through hole 9a in the circumferential direction of the through hole 9a.

When the Lorentz force shown in FIGS. 7 and 8 acts on the plurality of movable conductors 60, the movable conductor 60 adjacent to the movable element pin receiver 9 may come into contact with the protrusion 9b of the movable element pin receiver 9. By contacting the protrusion 9b near the movable pin 13, which is the center of rotation of the movable conductor 60, the friction torque generated in the movable conductor 60 is further reduced compared to the case without the protrusion 9b, and the movable pin receiver In the movable conductor 60 adjacent to the movable conductor 9, a decrease in the contact force between the movable contact 11a and the fixed contact 10 can be suppressed.

Note that the shape and number of the protrusions 9b shown in FIGS. 9 and 10 are merely examples, and the shape, height, and number of the protrusions 9b are not limited as long as they are arranged around the movable pin 13.

As described above, in the circuit breaker according to the second embodiment, the movable pin receiver 9A includes the protruding part 9b that protrudes in the extending direction of the movable pin 13, and the protruding part 9b is arranged around the movable pin 13. will be placed in As a result, in addition to the same effects as in the first embodiment, the circuit breaker according to the second embodiment reduces the contact force between the movable contact 11a and the fixed contact 10 in the movable conductor 60 adjacent to the movable pin receiver 9. can be suppressed.

Embodiment 3.
In the movable element holder of the circuit breaker according to the third embodiment, a region of the opposing surface facing the movable conductor at the end, which is away from a region around the holding part that holds the movable pin, is recessed with respect to an area around the holding part. This is different from the mover holder 7 of the circuit breaker according to the first and second embodiments. In the following, components having the same functions as those in Embodiment 1 will be denoted by the same reference numerals and explanations will be omitted, and differences from the circuit breaker in Embodiment 1 will be mainly explained.

FIG. 11 is a front view showing an example of a state in which the movable element holder, the movable element, the movable element pin receiver, and the flexible conductor according to the third embodiment are assembled. Note that the overall configuration of the circuit breaker 1 according to the third embodiment is the same as the circuit breaker 1 according to the first embodiment. Note that the circuit breaker according to the third embodiment may be configured to have a movable pin receiver 9A instead of the movable pin receiver 9.

As shown in FIG. 11, in the movable element holder 7B according to the third embodiment, an area of the facing surface 7e facing the movable conductor 60 at the end, which is away from the area around the holding part 7d that holds the movable element pin, holds the movable element holder 7B. This is different from the circuit breaker 1 according to the first embodiment in that it is recessed relative to the area around the portion 7d.

In the example shown in FIG. 11, each of the pair of side walls 70 of the movable element holder 7B has an opposing surface 7e that faces the movable conductor 60 at different ends, and the opposing surface 7e has an opposing surface 7e that faces the movable conductor 60 at different ends. The area away from the periphery of the holding part 7d to be held is recessed with respect to the area around the holding part 7d. The holding portion 7d is a portion of the side wall portion 70 that forms the pin receiving hole 7b.

The side wall portion 70 is thickened around the holding portion 7d, and the end region 7f of the side wall portion 70 far from the holding portion 7d is thinner than the area around the holding portion 7d. ing. In this way, the side wall portion 70 is thinned at the end region 7f, so that the opposing surface 7e is formed such that the end region 7f is recessed with respect to the region around the holding portion 7d.

When the Lorentz force shown in FIGS. 7 and 8 acts on the plurality of movable conductors 60, the movable conductor 60 at the end adjacent to the movable element holder 7B may tilt in the extending direction of the movable element pin 13. In this case, a portion of the movable conductor 60 at the end around the movable pin 13 contacts the area around the holding portion 7d of the facing surface 7e of the movable element holder 7B, but is far from the movable pin 13 at the movable conductor 60 at the end. The portion does not contact the end region 7f of the facing surface 7e of the movable element holder 7B.

When the movable conductor 60 at the end contacts around the movable pin 13, which is the center of rotation of the movable conductor 60 at the end, more damage occurs in the movable conductor 60 than when the movable conductor 60 contacts the end region 7f of the movable element holder 7B. The friction torque caused by the movable contact 11a and the fixed contact 10 can be suppressed from decreasing in the movable conductor 60 at both ends adjacent to the movable element holder 7B.

As described above, the movable element holder 7B of the circuit breaker according to the third embodiment has the opposing surface 7e that faces the movable conductor 60 disposed at the end in the extending direction among the plurality of movable conductors 60. In the facing surface 7e, an end region 7f, which is a region away from the region around the holding portion 7d that holds the movable pin 13, is recessed with respect to the region around the holding portion 7d. As a result, in the circuit breaker according to the third embodiment, in addition to the same effects as in the second embodiment, the contact force between the movable contact 11a and the fixed contact 10 is reduced in the movable conductor 60 at both ends adjacent to the movable element holder 7B. The decrease can be suppressed.

The configurations shown in the embodiments above are merely examples, and can be combined with other known techniques, or can be combined with other embodiments, within the scope of the gist. It is also possible to omit or change part of the configuration.

1 Circuit breaker, 2 Housing, 3 Power supply side terminal, 4 Load side terminal, 5 Flexible conductor, 6 Mover, 7, 7B Mover holder, 7a Spring mounting hole, 7b Pin receiving hole, 7c Pin mounting hole , 7d holding part, 7e opposing surface, 7f end region, 8 contact pressure spring, 9, 9A mover pin receiver, 9a, 60a through hole, 9b protrusion, 10 fixed contact, 11, 11a movable contact, 12 holder shaft , 13 mover pin, 20 electromagnetic actuator, 21 excitation coil, 25 shaft, 30 transmission mechanism, 31 connection link, 32 main shaft, 33 link, 34, 35, 37, 38 connection pin, 36 rotation shaft, 39 opening spring , 40 tripping mechanism, 60 movable conductor, 70 side wall section.

Claims (3)

a movable element including a plurality of movable conductors;
a mover holder that rotatably holds the plurality of movable conductors in a state where they are arranged in parallel via a mover pin extending in the arrangement direction of the plurality of movable conductors;
a mover pin receiver fixed to the mover holder and arranged in parallel with the plurality of movable conductors along the extending direction of the mover pin;
The movable pin is
held by the movable element holder and the movable element pin receiver,
The movable pin receiver is
A circuit breaker, characterized in that the circuit breaker is disposed at a position not adjacent to movable conductors disposed at both ends in the stretching direction among the plurality of movable conductors. The movable pin receiver is
comprising a protrusion that protrudes in the stretching direction,
The protruding portion is
The circuit breaker according to claim 1, wherein the circuit breaker is arranged around the movable pin. The movable element holder is
having a facing surface facing a movable conductor disposed at an end in the stretching direction among the plurality of movable conductors;
The opposing surface is
The circuit breaker according to claim 1 or 2, wherein a region remote from a region around the holding portion that holds the movable pin is recessed with respect to a region around the holding portion.

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