JP7446204B2 - 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 as a reaction force on the movable conductor, so the circuit breaker requires a closing force that exceeds the Lorentz force.

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

However, in the technique described in Patent Document 1, the spacer is also displaced as the movable conductor is displaced due to the Lorentz force acting in the parallel direction of the movable conductors, so the range in which the movable conductor is displaced becomes large. Therefore, if the movable contact attached to the movable conductor comes into contact with the fixed contact and a large current flows through the movable conductor, the movable conductor will be largely displaced and the contact between the movable contact and the fixed contact will become unstable during closing operation. . If the contact between the movable contact and the fixed contact becomes unstable during the closing operation, there is a possibility that an arc will occur between the contacts, 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 stabilize contact 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 movable element including a plurality of movable conductors, and a movable element that is rotatable via a movable element pin in a state where the plurality of movable conductors are arranged in parallel. and a movable element holder to be held in the movable element holder. The mover holder is disposed around the mover pin and includes a pair of holder protrusions that protrude toward both sides of each of the plurality of movable conductors in the extending direction of the mover pin.

According to the present disclosure, it is possible to stabilize the contact 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 diagram showing an example of the configuration of a movable element and a movable element holder in the circuit breaker according to Embodiment 1. A diagram showing how the movable conductor rotates after the movable contact attached to the movable conductor contacts the fixed contact in the circuit breaker according to Embodiment 1. A diagram 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 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. Front view of the movable element holder according to the first embodiment A front view of the movable element holder holding a plurality of movable conductors according to the first embodiment. A diagram showing an example of the shape of a protrusion according to Embodiment 1. A diagram showing another example of the shape of the protrusion according to the first embodiment. A diagram showing still another example of the shape of the protrusion according to the first embodiment. A front view of a movable element holder holding a plurality of movable conductors according to Embodiment 2 A diagram showing an example of a plurality of protective covers each attached to a corresponding movable conductor among a plurality of movable conductors according to Embodiment 2. A diagram showing another example of the plurality of protective covers each attached to a corresponding movable conductor among the plurality of movable conductors according to the second embodiment.

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

Embodiment 1.
The circuit breaker according to the first embodiment 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. Note that the circuit breaker according to the first embodiment may be a circuit breaker other than an air circuit breaker. In the following, for convenience of explanation, the Z-axis positive direction is assumed to be upward, and the Z-axis negative direction is assumed to be downward.

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. As shown in FIG. 1, the circuit breaker 1 according to the first embodiment includes a housing 2 formed of an insulating member, a power supply side terminal 3 and a load side terminal 4 attached to the housing 2, respectively. 2, and a flexible conductor 5 having one end connected to the load side terminal 4.

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, and a contact pressure spring 8 having one end and the other end attached to the other end of the mover holder 7 and the other end of the mover 6. 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.

FIG. 3 is a diagram showing an example of the configuration of a movable element and a movable element holder 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 the movable element pin 13.

The movable element holder 7 includes a plurality of partition plates 72 that are arranged in the extending direction of the movable element pin 13 and form a plurality of accommodating parts 71 that each accommodate a corresponding movable conductor among the plurality of movable conductors 60. Each housing portion 71 is a space surrounded by two adjacent partition plates 72.

The mover pin 13 is fixed to the mover holder 7. Each movable conductor 60 is formed with a through hole 61 (described later) through which the movable pin 13 is inserted, and each movable conductor 60 is rotatable with respect to the movable pin 13 . A movable contact 11a is attached to each movable conductor 60. The movable contacts 11a of the plurality of movable conductors 60 constitute the movable contact 11 shown in FIGS. 1 and 2. Note that the number of movable conductors 60 is not limited to five, and may be two or more and less than four, or six or more. The number of accommodating portions 71 and partition plates 72 corresponds to the number of movable conductors 60.

Returning to FIG. 1, the explanation of the circuit breaker 1 will be continued. 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. and a drive circuit 45 that drives the electromagnetic actuator 20.

In the electromagnetic actuator 20, when the excitation coil 21 is energized by the drive circuit 45, 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 whose absolute position is fixed with respect 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 connected to one end of the movable element 6 and the intermediate part of the movable element holder 7 by a movable element pin 13 . is attached to.

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 of the circuit breaker 1 are electrically connected.

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

FIG. 4 is a diagram showing how the movable conductor rotates after the movable contact attached to the movable conductor contacts the fixed contact in the circuit breaker according to the first embodiment. As shown in the left diagram in FIG. 4, 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 instantaneously.

In the state shown in the left diagram in FIG. 4, the circuit breaker 1 has not yet reached the closed state, which is the final closed state, and the movable pin 13 is further pushed to the right in FIG. 4 by the transmission mechanism 30. The circuit enters a closed state as shown in the figure on the right. In this way, after the large current flows, it is necessary to further push the movable pin 13 to the right in FIG. Lorentz force acts on the flexible conductor 5.

FIG. 5 is a diagram 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. FIG. 6 is a perspective 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 FIGS. 5 and 6, 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 movable element pin 13. Therefore, the Lorentz force acts as a force that presses the plurality of movable conductors 60 against the plurality of partition plates 72 in the movable element holder 7. Further, in the circuit breaker 1, a Lorentz force acts between the movers 6 provided for each phase in the left-right direction in FIG.

The force that presses the movable conductor 60 against the partition plate 72 becomes a normal force and generates frictional torque between the partition plate 72 and the movable conductor 60. Therefore, the contact pressure of the movable contact 11a against the fixed contact 10 decreases, but as shown in FIG. A pair of protrusions 75 protruding toward the movable pin 13 are arranged around the movable pin 13 . One of the pair of protrusions 75 is provided on one of the two adjacent partition plates 72, and the other is provided on the other of the two adjacent partition plates 72.

When a pressing force is applied to the movable conductor 60 against the partition plate 72, the movable conductor 60 comes into contact with at least one of the pair of protrusions 75. Therefore, in the circuit breaker 1, the friction between the mover holder 7 and the movable conductor 60 is greater than when the movable conductor 60 contacts the flat part 74 of the partition plate 72 without the protrusion 75 disposed on the partition plate 72. Torque can be reduced. Moreover, since the movable conductor 60 contacts the partition plate 72 only at the protrusion 75, variations in friction torque can be reduced. As a result, the circuit breaker 1 can stabilize the contact between the movable contact 11a and the fixed contact 10 while preventing an increase in reaction force due to friction when closing a short circuit, resulting in a stable short circuit. A circuit can be closed.

Moreover, the circuit breaker 1 can reduce the range in which the movable conductor 60 is displaced by the Lorentz force acting on the movable conductor 60 by restraining the movement of the movable conductor 60 in the left-right direction shown in FIG. 5 with the protrusion 75. Therefore, while a large current is flowing between the movable contact 11a and the fixed contact 10, the range in which the movable contact 11a slides on the fixed contact 10 and is displaced in the left-right direction shown in FIG. 5 can be reduced. This also makes it possible to stabilize the contact between the movable contact 11a and the fixed contact 10.

Hereinafter, the configuration of the movable element holder 7 will be explained in more detail. FIG. 7 is a front view of the mover holder according to the first embodiment, and FIG. 8 is a front view of the mover holder holding a plurality of movable conductors according to the first embodiment.

The movable element holder 7 shown in FIG. 7 includes a plurality of accommodating parts 71, a plurality of partition plates 72, and a support part 73 that supports the plurality of partition plates 72 and is rotatably supported by the holder shaft 12. Each partition plate 72 has a flat portion 74 and one or more protrusions 75. The protrusion 75 includes a protrusion 75 ₁ and a protrusion 75 ₂ . The two adjacent partition plates 72 have a pair of protrusions 75 ₁ that face each other in the left-right direction in FIG. 7 and a pair of protrusions 75 ₂ that face each other in the left-right direction in FIG. 7 .

As shown in FIG. 8, when a plurality of movable conductors 60 are attached to the movable element holder ₇ via the movable element pins ₁₃ , there is a movable The conductor 60 is now placed. Therefore, in the circuit breaker 1 according to the first embodiment, the range in which the plurality of movable conductors 60 are displaced in the left-right direction in FIG. 8 can be reduced compared to the case where the protrusion 75 is not provided. As a result, in the circuit breaker 1, it is possible to stabilize the contact between the movable contact 11a and the fixed contact 10 while preventing the reaction force due to friction from increasing when the short circuit is closed, resulting in a stable short circuit. A circuit can be closed.

Further, as shown in FIG. 8, the pair of protrusions ₇₅₁ are arranged at a position closer to the movable pin 13 than one end of the movable conductor 60 in the vertical direction in FIG. 8, which is the extending direction of the movable conductor 60, The pair of protrusions ₇₅₂ are arranged closer to the movable pin 13 than the other end of the movable conductor 60 in the vertical direction in FIG. Therefore, _{the movable} element holder 7 The frictional torque between the movable conductor 60 and the movable conductor 60 can be reduced, and the contact between the movable contact 11a and the fixed contact 10 can be further stabilized.

In the example shown in FIG. 8, the pair of protrusions ₇₅₁ come into contact with the movable conductor 60 below the movable contact 11a in the vertical direction in FIG. Further, the distance between the pair of protrusions 75 ₂ and the movable element pin 13 is equal to or less than the distance between the pair of protrusions 75 ₁ and the movable element pin 13 . Therefore, the friction torque between the movable element holder 7 and the plurality of movable conductors 60 can be reduced compared to the case where the pair of protrusions ₇₅₁ are arranged above the movable contact 11a in the vertical direction in FIG. Therefore, the contact between the movable contact 11a and the fixed contact 10 can be made more stable.

FIG. 9 is a diagram showing an example of the shape of the protrusion according to the first embodiment. Note that the partition plate 72 shown in FIG. 9 is one of the plurality of partition plates 72 that is continuous with the support portion 73 in the vertical direction in FIG.

As shown in FIG. 9, the protruding portion 75 ₁ and the protruding portion 75 ₂ extend in a direction perpendicular to the extending direction of the movable pin 13 and have extending regions facing each other. This stretching region may be a region extending linearly or may be a region extending arcuately centering on the movable pin 13.

In the above-mentioned example, the movable element holder 7 has the protruding part 75 ₁ and the protruding part 75 ₂ , but the movable element holder 7 may be configured without the protruding part 75 ₂ . In this case, the protrusion ₇₅₁ is formed, for example, in a shape that includes an annular region surrounding the movable pin 13. FIG. 10 is a diagram showing another example of the shape of the protrusion according to the first embodiment, and FIG. 11 is a diagram showing still another example of the shape of the protrusion according to the first embodiment. Note that the partition plate 72 shown in FIGS. 10 and 11 is one of the plurality of partition plates 72 that is continuous with the support portion 73 in the vertical direction in FIGS. 10 and 11.

In the example shown in FIG. 10, the protrusion ₇₅₁ is formed in an annular shape surrounding the movable pin 13 inserted into the through hole 76 formed in the partition plate 72. In the example shown in FIG. The annular region surrounding the movable pin 13 inserted into the through hole 76 is formed at the edge of the through hole 76 through which the movable pin 13 is inserted. good. In the example shown in FIG. 11, the protrusion ₇₅₁ is formed in a shape including an annular region surrounding the through hole 76 and an extending region extending leftward in FIG. 11 from the annular region.

As described above, the circuit breaker 1 according to the first embodiment has a movable member 6 including a plurality of movable conductors 60, and a state in which the plurality of movable conductors 60 are arranged in parallel and can be rotated via the movable member pin 13. A movable element holder 7 for holding the movable element holder 7 is provided. The movable element holder 7 is arranged around the movable element pin 13 and includes a pair of protrusions 75 that protrude toward both side surfaces 601 and 602 of each of the plurality of movable conductors 60 in the extending direction of the movable element pin 13. The pair of protrusions 75 are an example of the pair of holder protrusions. Thereby, the circuit breaker 1 can stabilize the contact between the movable contact 11 and the fixed contact 10 during the closing operation.

Further, the movable element holder 7 includes a plurality of partition plates 72 that are arranged in the extending direction of the movable element pin 13 and form a plurality of accommodating parts 71 that each accommodate a corresponding movable conductor among the plurality of movable conductors 60. The pair of protrusions 75 protrude from a pair of adjacent partition plates 72 among the plurality of partition plates 72 in the direction in which the movable pin 13 extends. Thereby, in the circuit breaker 1, the pair of protrusions 75 can be easily formed on the movable element holder 7.

Further, the movable element holder 7 includes a plurality of pairs of protrusions 75 ₁ and 75 ₂ for each of the plurality of movable conductors 60 . The plurality of pairs of protrusions 75 ₁ and 75 ₂ are formed at positions facing each other via the movable element pin 13 in a direction orthogonal to the extending direction of the movable element pin 13 . Thereby, in the circuit breaker 1, the contact between the movable contact 11 and the fixed contact 10 can be made more stable during the closing operation.

Further, the plurality of pairs of protrusions 75 ₁ and 75 ₂ extend along a direction perpendicular to the extending direction of the movable element pin 13 when viewed from the extending direction of the movable element pin 13, and have extending regions facing each other. Thereby, the circuit breaker 1 can further stabilize the contact between the movable contact 11 and the fixed contact 10 during the closing operation.

Each of the pair of protrusions 75 has an annular region surrounding the movable pin 13 when viewed from the direction in which the movable pin 13 extends. Thereby, the circuit breaker 1 can further stabilize the contact between the movable contact 11 and the fixed contact 10 during the closing operation.

Embodiment 2.
The circuit breaker according to the second embodiment is implemented in that it further includes a plurality of protective covers that cover different movable conductors among the number of movable conductors 60 and are formed with protrusions that protrude toward adjacent protective covers. This is different from the circuit breaker 1 according to the first embodiment. In the following, components having the same functions as those in Embodiment 1 are given the same reference numerals and explanations are omitted, and differences from circuit breaker 1 in Embodiment 1 will be mainly explained.

FIG. 12 is a front view of a movable element holder holding a plurality of movable conductors according to the second embodiment. As shown in FIG. 12, the circuit breaker according to the second embodiment includes a protective cover 9A that covers the movable element 6, the movable element holder 7, and three movable conductors 60 among the five movable conductors 60 that constitute the movable element 6. , 9B, and 9C, this circuit breaker is different from the circuit breaker 1 according to the first embodiment. Hereinafter, when each of the protective covers 9A, 9B, and 9C is shown without being individually distinguished, it may be referred to as a protective cover 9.

FIG. 13 is a diagram illustrating an example of a plurality of protective covers each attached to a corresponding movable conductor among a plurality of movable conductors according to the second embodiment. As shown in FIG. 13, the protective cover 9A includes a first side wall 91A, a second side wall 92A, and a connecting portion 93A that connects the first side wall 91A and the second side wall 92A.

The first side wall 91A is provided with protrusions 94 and 95 that protrude to the left in FIG. 12, and the second side wall 92A is provided with protrusions 94 and 95 that protrude to the right in FIG. In the example shown in FIG. 12, the top surfaces of the protrusions 94 and 95 are rectangular flat surfaces, but may have other shapes.

Moreover, the protective cover 9B includes a first side wall 91B, a second side wall 92B, and a connecting portion 93B that connects the first side wall 91B and the second side wall 92B. The first side wall 91B is provided with protrusions 94 and 95 that protrude leftward in FIG. 12, but the second side wall 92B is not provided with the protrusions 94 and 95 and is formed flat.

Further, the protective cover 9C includes a first side wall 91C, a second side wall 92C, and a connecting portion 93C that connects the first side wall 91C and the second side wall 92C. The first side wall 91C is formed flat without protrusions 94 and 95, but the second side wall 92C is provided with protrusions 94 and 95 that protrude rightward in FIG. 12.

In the vertical direction in FIG. 12, the protrusion 94 and the protrusion 95 are formed at positions sandwiching the movable pin 13. The protrusion 94 is formed at a position farther from the mover pin 13 than the protrusion 75 ₁ provided on the partition plate 72 , and the protrusion 95 is formed further away from the mover pin 13 than the protrusion 75 ₂ provided on the partition plate 72 It is formed at a position far from 13.

As shown in FIG. 12, the protrusions 94 and 95 of the first side wall 91A of the protective cover 9A are opposed to the second side wall 92B of the protective cover 9B, and the protrusions 94 and 95 of the second side wall 92A of the protective cover 9A are , facing the first side wall 91C of the protective cover 9C. Furthermore, the protrusions 94 and 95 of the first side wall 91B of the protective cover 9B face the movable conductor 60, which faces the first side wall 91B of the protective cover 9B. Furthermore, the protrusions 94 and 95 of the second side wall 92C of the protective cover 9C face the movable conductor 60, which faces the second side wall 92C of the protective cover 9C.

When the Lorentz force acts on the plurality of movable conductors 60 shown in FIG. contact, the frictional torque generated in the movable conductor 60 is dispersed. Since the protective cover 9 and the movable conductor 60 have the same displacement in the back-to-front direction in FIG. The friction torque generated at the protrusions 94 and 95 of the protective covers 9A, 9B, and 9C is considerably smaller than the friction torque generated at the protrusion 75. Therefore, compared to the circuit breaker 1 described in Embodiment 1, the circuit breaker described in Embodiment 2 can further suppress an increase in reaction force due to frictional torque when a short circuit is closed, and is fixed. The contact between the contact 10 and the movable contact 11a can be further stabilized. Note that the front-rear direction in FIG. 12 is the left-right direction in FIG. 2.

Furthermore, since the protrusions 94 and 95 of the protective cover 9 can further reduce the range in which the movable conductor 60 is displaced in the left-right direction in FIG. In this case, the contact between the fixed contact 10 and the movable contact 11a can be further stabilized.

FIG. 14 is a diagram illustrating another example of the plurality of protective covers each attached to a corresponding movable conductor among the plurality of movable conductors according to the second embodiment. In the protective cover 9A shown in FIG. 14, the first side wall 91A is provided with a protrusion 94 that protrudes to the left in FIG. 12, and the second side wall 92A is provided with a protrusion 94 that protrudes to the right in FIG.

Furthermore, protrusions 94 are provided on the first side wall 91B of the protective cover 9B and the second side wall 92C of the protective cover 9C, but on the second side wall 92B of the protective cover 9B and the first side wall 91C of the protective cover 9C, The protrusion 94 is not provided and is formed flat. The protrusion 94 shown in FIG. 14 has a cylindrical shape, and the top surface of the protrusion 94 is an annular flat surface. The protruding portion 94 is arranged at a position surrounding the through hole 61 of the movable conductor 60 through which the movable pin 13 is inserted when viewed from the left and right direction in FIG.

In the example described above, the protective cover 9 is provided with the protrusions 94 and 95, but the movable conductor 60 may be provided with the protrusions 94 and 95 without providing the protective cover 9. In this case, when the Lorentz force acts on the plurality of movable conductors 60, the movable conductors 60 come into contact with each other, so that the frictional torques between the movable conductors 60 cancel each other out. Therefore, when the short circuit is closed, the reaction force due to friction torque can be reduced, and the short circuit can be stably closed. Note that the circuit breaker according to the second embodiment may have a configuration in which protrusions 94 and 95 are provided on the protective cover 9 and the movable conductor 60, respectively.

As described above, the circuit breaker according to the second embodiment includes a plurality of protective covers 9 that cover different movable conductors 60 among the plurality of movable conductors 60. Each of the plurality of protective covers 9 includes protrusions 94 and 95 that protrude in the extending direction of the movable element pin 13 and face the adjacent protective cover 9 or movable conductor 60. The protrusions 94 and 95 are examples of a plurality of cover protrusions. The plurality of protrusions 94 and 95 are arranged around the movable pin 13. Thereby, the circuit breaker according to the second embodiment can prevent the reaction force from increasing due to frictional torque when closing the short circuit, and can stably close the short circuit.

Furthermore, the protrusions 94 and 95 are formed at positions farther from the movable element pin 13 than the pair of protrusions 75 ₁ and 75 ₂ . As a result, the circuit breaker according to the second embodiment can more accurately prevent the ends of the plurality of movable conductors 60 from coming into contact with each other, and the contact between the movable contact 11 and the fixed contact 10 during the closing operation. Contact can be made more stable.

Furthermore, at least a portion of the plurality of movable conductors 60 includes a movable conductor protrusion that protrudes in the extending direction of the movable element pin 13 and faces an adjacent movable conductor 60. Thereby, the circuit breaker 1 can more accurately prevent the ends of the plurality of movable conductors 60 from coming into contact with each other, and the contact between the movable contact 11 and the fixed contact 10 can be made more stable during the closing operation. be able to.

Further, for example, by adjusting the positions and heights of the protrusions 94 and 95 of the protective covers 9A, 9B, and 9C, the shape of the protective cover 9 can be made the same, and at least two movable conductors 60, and at most all the movable conductors A similar effect can be expected even if the protective cover 9 is attached to the cover 60. Furthermore, by reducing the number of shapes of the protective cover 9, the number of parts can be reduced, and costs can be reduced.

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 Movable element holder, 8 Contact pressure spring, 9, 9A, 9B, 9C Protective cover, 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 Connecting link, 32 Main shaft, 33 Link, 34, 35, 38 Connecting pin , 36 rotating shaft, 39 opening spring, 40 tripping mechanism, 45 drive circuit, 60 movable conductor, 61, 76 through hole, 71 housing section, 72 partition plate, 73 support section, 74 flat section, 75, 75 ₁ , 75 ₂ , 94, 95 Projection, 91A, 91B, 91C First side wall, 92A, 92B, 92C Second side wall, 93A, 93B, 93C Connection portion, 601, 602 Side surface.

Claims (8)

a movable element including a plurality of movable conductors;
a mover holder that rotatably holds the plurality of movable conductors arranged in parallel via a mover pin;
The movable element holder is
A circuit breaker comprising a pair of holder protrusions arranged around the movable pin and protruding toward both side surfaces of each of the plurality of movable conductors in the extending direction of the movable pin. The movable element holder is
comprising a plurality of partition plates arranged in the extending direction of the movable pin and forming a plurality of accommodating portions each accommodating a corresponding movable conductor among the plurality of movable conductors;
The pair of holder protrusions are
The circuit breaker according to claim 1, wherein a pair of adjacent partition plates among the plurality of partition plates protrudes in the extending direction of the movable pin. The movable element holder is
A plurality of the pair of holder protrusions are provided for each of the plurality of movable conductors,
The plurality of pairs of holder protrusions include:
The circuit breaker according to claim 1 or 2, wherein the breakers are formed at positions facing each other via the mover pin in a direction perpendicular to the extending direction of the mover pin. The plurality of pairs of holder protrusions include:
According to claim 3, it has stretching regions extending along a direction orthogonal to the stretching direction of the movable pin when viewed from the stretching direction of the movable pin and facing each other with the movable pin in between. circuit breaker. Each of the pair of holder protrusions is
The circuit breaker according to claim 1 or 2, further comprising an annular region surrounding the movable pin when viewed from the extending direction of the movable pin. comprising a plurality of protective covers that cover mutually different movable conductors among the plurality of movable conductors,
Each of the plurality of protective covers includes:
a cover protrusion that protrudes in the extending direction of the movable pin and faces the adjacent protective cover or the movable conductor;
The cover protrusion includes:
The circuit breaker according to any one of claims 3 to 5, wherein the circuit breaker is arranged around the movable pin. The cover protrusion includes:
The circuit breaker according to claim 6, wherein the movable element pin is formed at a position further away from the pair of holder protrusions. At least some of the plurality of movable conductors are
The circuit breaker according to any one of claims 3 to 5, further comprising a movable conductor protrusion that protrudes in the extending direction of the movable pin and faces an adjacent movable conductor.

Images