JP6945499B2 - Circuit breaker - Google Patents

Description

The present invention relates to circuit breakers such as wiring breakers and earth-leakage circuit breakers.

As disclosed in Patent Document 1, a mover to which a movable contact facing a fixed contact is attached, a contact arm that holds the mover on the tip side, and a bearing that rotatably supports the base end of the contact arm. Circuit breakers with members are known. In such a circuit breaker, the contact arm rotates as the handle opens and closes, so that the movable contact and the fixed contact are brought into contact with each other and separated from each other.

Jikkenhei 1-134949

In a conventional circuit breaker, since only the base end of the contact arm is supported, the movable contact held by the contact arm on the tip side via the mover swings in a direction orthogonal to the extension direction of the contact arm. There is. Therefore, the contact position between the movable contact and the fixed contact may not be stable, and the breaking performance may vary.

The present invention has been made in view of the above, and an object of the present invention is to obtain a circuit breaker capable of reducing variations in breaking performance.

In order to solve the above-mentioned problems and achieve the object, the circuit breaker of the present invention has an insulating base, a fixed contact supported by the base, and a mover having a movable contact facing the fixed contact. A contact arm that extends along the first direction and holds the mover on the tip side, and a rotation axis that rotatably supports the base end of the contact arm along the second direction that is orthogonal to the first direction. It is provided with a bearing member. The contact arm has a plurality of protrusions that protrude along the second direction. At least one of the base and the bearing member has a plurality of guide holes that guide the plurality of protrusions as the contact arm rotates.

According to the present invention, there is an effect that the variation in blocking performance can be reduced.

Partial perspective front view of a part of the circuit breaker according to the first embodiment of the present invention. Front view of the base of the circuit breaker according to the first embodiment. Cross-sectional view taken along the line III-III shown in FIG. The figure for demonstrating the off state of the circuit breaker which concerns on Embodiment 1. The figure for demonstrating the on-state of the circuit breaker which concerns on Embodiment 1. The figure for demonstrating the trip state of the circuit breaker which concerns on Embodiment 1. Top view of the contact arm according to the first embodiment Side view of the contact arm according to the first embodiment Front view of the contact arm according to the first embodiment Side view of the bearing member according to the first embodiment Front view of a pair of bearing members according to the first embodiment Top view of a pair of bearing members according to the first embodiment Side view of the base according to the first embodiment

Hereinafter, the circuit breaker according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a partial perspective front view of a part of the circuit breaker according to the first embodiment of the present invention. FIG. 2 is a front view of the base of the circuit breaker according to the first embodiment. FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG.

In the following, for convenience of explanation, the coordinates of the XYZ axes are attached to the drawings. In the coordinates of the XYZ axes, the Z-axis positive direction is upward, the Z-axis negative direction is downward, the X-axis positive direction is right, the X-axis negative direction is left, and the Y-axis positive direction is forward. , The negative direction of the Y axis is the backward direction.

The circuit breaker 1 shown in FIG. 1 is, for example, a wiring breaker or an earth-leakage circuit breaker. Such a circuit breaker 1 includes a housing 10 having a base 11 and a cover 12 each formed of an insulating member, a first circuit breaker unit 13A, a second circuit breaker unit 13B, and a third circuit breaker unit 13C. Be prepared. In FIG. 1, the first circuit cutoff unit 13A is hidden behind the cover 12 and cannot be seen.

The first circuit cutoff unit 13A, the second circuit cutoff unit 13B, and the third circuit cutoff unit 13C are arranged in parallel with each other on the base 11 of the housing 10, and are electric circuits of different phases among the three phases of three-phase alternating current. To shut off. Hereinafter, when each of the first circuit cutoff unit 13A, the second circuit cutoff unit 13B, and the third circuit cutoff unit 13C is shown without distinction, it may be referred to as the circuit cutoff unit 13.

As shown in FIG. 2, the base 11 has a plurality of wall portions 111 to 114 extending in the front-rear direction and formed at intervals in the left-right direction. The wall portions 111 and 112 are outer wall portions, and the wall portions 113 and 114 are partition wall portions.

The plurality of wall portions 111 to 114 form a first storage space 120A, a second storage space 120B, and a third storage space 120C in this order along the left-right direction. The first storage space 120A is formed between the wall portion 112 and the wall portion 114, and the first circuit cutoff unit 13A is housed in the first storage space 120A. The second storage space 120B is formed between the wall portion 114 and the wall portion 113, and the second circuit cutoff unit 13B is housed in the second storage space 120B. The third storage space 120C is formed between the wall portion 113 and the wall portion 111, and the third circuit cutoff unit 13C is housed in the third storage space 120C.

As shown in FIG. 3, each circuit cutoff unit 13 opens and closes a power supply side terminal 21 connected to a power supply side electric wire (not shown), a load side terminal 22 connected to a load side electric wire (not shown), and an electric circuit. An opening / closing mechanism 23 for performing the operation and an arc extinguishing device 24 for cutting the arc are provided. Hereinafter, the power supply side terminal 21 side of the circuit breaker 1 may be described as the power supply side, and the load side terminal 22 side of the circuit breaker 1 may be described as the load side. In FIG. 3, the cross sections other than the housing 10 are not hatched.

The opening / closing mechanism 23 includes a fixed contact 31, a movable contact 32, a mover 33, a contact arm 34, a pressure contact spring 35, and a shunt 36. The fixed contact 31 is fixed to one end of the power supply side terminal 21 and is supported by the base 11. The fixed contact 31 includes an arc fixed contact 31a and a main fixed contact 31b.

The movable contact 32 faces the fixed contact 31 and is fixed to the mover 33. The movable contact 32 includes an arc movable contact 32a facing the arc fixed contact 31a and a main movable contact 32b facing the main fixed contact 31b. Although not shown, a plurality of sets of a main fixed contact 31b and a main movable contact 32b are provided in each circuit cutoff unit 13. The number of pairs of the main fixed contact 31b and the main movable contact 32b is, for example, four.

The movable contact 32 is fixed to the mover 33. The mover 33 includes an arc mover 33a to which the arc movable contact 32a is fixed and a main mover 33b to which the main movable contact 32b is fixed.

The contact arm 34 extends along the anteroposterior direction. The tip end side of the contact arm 34 is connected to the base end of the mover 33 by a connecting pin 81, and the base end of the mover 33 is rotatably held. The contact arm 34 is configured to surround a part of the mover 33 and a part of the shunt 36. The configuration of the contact arm 34 will be described in detail later. The front-back direction, which is the extension direction of the contact arm 34, is an example of the first direction.

The pressure contact spring 35 is hung on the mover 33 and the contact arm 34, and applies contact pressure between the fixed contact 31 and the movable contact 32 with the connecting pin 81 as a fulcrum. The pressure contact spring 35 includes a pressure spring 35a applied to the arc mover 33a and the contact arm 34, and a pressure spring 35b applied to the main mover 33b and the contact arm 34.

One end of the shunt 36 is electrically connected to the load side terminal 22 and the other end is connected to the mover 33. The shunt 36 electrically connects the mover 33 to the load-side terminal 22. The shunt 36 is composed of, for example, a plurality of flexible conductors that are independent of each other.

The arc extinguishing device 24 is arranged above the power supply side terminal 21 and the arc extinguishing chamber 41 that cuts the arc generated between the fixed contact 31 and the movable contact 32, and is located between the fixed contact 31 and the movable contact 32. It is provided with an arc runner 42 that attracts the generated arc and guides it to the arc extinguishing chamber 41.

The circuit breaker 1 is detected by an opening / closing mechanism portion 14 that opens / closes a three-phase electric circuit, a trip bar 15 that trips the opening / closing mechanism portion 14, a CT (Current Transformer) 16 that detects a current flowing through the electric circuit, and a CT16. Includes a trip bar 17 that drives the trip bar 15 based on the current.

The opening / closing mechanism portion 14 is attached to the opening / closing mechanism 23 of the above-mentioned three circuit breaking units 13, the handle 50 for operation, the pair of bearing members 51, and the handle 50, and the lower end portion can be rotated by the bearing member 51. It is provided with a supported handle arm 52. The base end of the contact arm 34 is attached to the pair of bearing members 51 via the connecting pin 83, and the center of the contact arm 34 extending in the left-right direction of the connecting pin 83 by the pair of bearing members 51 and the connecting pin 83. It is rotatably supported with the wire as the axis of rotation.

Further, the opening / closing mechanism portion 14 is rotatably attached to the lower link 53 having one end rotatably attached to the contact arm 34 of the second circuit cutoff unit 13B and rotatably attached to the other end of the lower link 53 by a connecting pin 60. It is provided with an upper link 54. One end of the lower link 53 is rotatably attached to the central portion of the contact arm 34 in the front-rear direction by a connecting pin 82.

Further, the opening / closing mechanism portion 14 is rotatably supported at one end by a crossbar 55 attached to the base end of the handle arm 52 by a fixing member 39 and a bearing member 51, and an intermediate portion rotates at the other end of the upper link 54. It is equipped with a cradle 56 that can be attached. Further, the opening / closing mechanism portion 14 includes a receiver 57 that engages with the other end of the cradle 56, and a main spring 58 having one end attached to the upper end portion of the handle arm 52 and the other end attached to the connecting pin 60.

Of the opening / closing mechanism portion 14, the handle 50, the bearing member 51, the handle arm 52, the lower link 53, the upper link 54, the cradle 56, the receiver 57, and the main spring 58 are located in the second storage space 120B shown in FIG. Be placed. Further, the crossbar 55 extends in the left-right direction from the first storage space 120A to the third storage space 120C, and is arranged so as to straddle the first storage space 120A, the second storage space 120B, and the third storage space 120C. NS. The contact arm 34 of the first circuit cutoff unit 13A and the contact arm 34 of the third circuit cutoff unit 13C are connected to the contact arm 34 of the second circuit cutoff unit 13B by the crossbar 55.

The trip device 17 includes a trip relay 61 and a reset mechanism 62. The trip relay 61 operates when an overcurrent or an electric leakage in the electric circuit is detected based on the current detected by the CT16. The reset mechanism 62 puts the trip device 17 into the reset state.

Next, the operation of the circuit breaker 1 will be described. FIG. 4 is a diagram for explaining an off state of the circuit breaker according to the first embodiment. FIG. 5 is a diagram for explaining an ON state of the circuit breaker according to the first embodiment. FIG. 6 is a diagram for explaining a trip state of the circuit breaker according to the first embodiment. In addition, in FIGS. 4 to 6, the contact pressure spring 35 and the like are not shown.

First, the closing operation of the circuit breaker 1 will be described. When the handle 50 shown in FIG. 3 is moved toward the load side from the trip state shown in FIG. 6 in which the spring force is not accumulated in the main spring 58, the circuit breaker 1 has a cradle 56 as shown in FIG. Engages with the receiver 57, so that the spring force is accumulated in the main spring 58.

Further, the contact arm 34 of the second circuit cutoff unit 13B is rotated around the connecting pin 83 in the direction in which the tip thereof is directed upward. As the contact arm 34 of the second circuit cutoff unit 13B rotates, the contact arm 34 of the first circuit cutoff unit 13A and the contact arm 34 of the third circuit cutoff unit 13C are brought into contact with each other by the crossbar 55 of the second circuit cutoff unit 13B. It rotates in the same direction as the contact arm 34.

In the circuit breaker 1, when the handle 50 shown in FIG. 3 is moved from the state shown in FIG. 4 toward the power supply side, the handle arm 52 attached to the handle 50 serves as a fulcrum of the convex portion 51a of the bearing member 51. Rotate to. As a result, as shown in FIG. 5, the main spring 58 tilts toward the power supply side, and the contact arm 34 of each circuit cutoff unit 13 rotates about the connecting pin 83 due to the spring force accumulated in the main spring 58. The rotation of the contact arm 34 of each circuit cutoff unit 13 causes the fixed contact 31 and the movable contact 32 to come into contact with each other, and the electric circuit is closed.

Next, the breaking operation of the circuit breaker 1 will be described. In the circuit breaker 1 in the state shown in FIG. 5, when an overcurrent or an electric leakage occurs, the trip relay 61 detects the overcurrent or the electric leakage based on the current output from the CT 16 and starts the operation. When the operation of the trip relay 61 is started, the connecting plate 62a of the reset mechanism 62 shown in FIG. 3 pushes in the trip bar 15 shown in FIG. As a result, the engagement between the cradle 56 and the receiver 57 is released.

When the engagement between the cradle 56 and the receiver 57 is released, the mover 33 provided on the tip end side of each circuit cutoff unit 13 is centered on the connecting pin 83 by the urging force of the pressure spring 35 shown in FIG. As a result, it rotates in the direction away from the fixed contact 31. Therefore, the movable contact 32 and the fixed contact 31 start to be separated, and an arc is generated between the movable contact 32 and the fixed contact 31. Then, as the separation between the movable contact 32 and the fixed contact 31 increases, the arc is greatly extended. Such an arc is attracted to the arc extinguishing chamber 41 by the arc runner 42, and is extinguished in the arc extinguishing chamber 41. As a result, the circuit breaker 1 is in a trip state.

In the circuit breaker 1 according to the first embodiment, the contact arm 34, the bearing member 51, and the base 11 have a configuration for reducing the variation in the breaking performance. Hereinafter, the configuration of the contact arm 34, the configuration of the bearing member 51, and the configuration of the base 11 will be described in this order.

FIG. 7 is a top view of the contact arm according to the first embodiment. FIG. 8 is a side view of the contact arm according to the first embodiment. FIG. 9 is a front view of the contact arm according to the first embodiment.

As shown in FIGS. 7 to 9, the contact arm 34 is a first side that bends from a flat plate-shaped main body 70 and one end and the other end in the left-right direction of the main body 70, extends downward, and faces each other. A portion 71 and a second side portion 72 are provided. The contact arm 34 is formed, for example, by performing a punching process, a bending process, a punching process, or the like on a metal plate. At least a portion of the shunt 36 is located in the area between the first side portion 71 and the second side portion 72.

The main body 70 is formed with an opening 70a into which a lower link 53 is inserted, a downwardly launched portion 70b, and a plurality of mounting holes 70c for mounting a fixing member 39 for fixing the crossbar 55. NS.

The first side portion 71 has a first protruding portion 71a at the lower end, which extends away from the main body portion 70 and extends in the right direction. Further, the second side portion 72 has a second protruding portion 72a at the lower end, which extends away from the main body portion 70 and extends in the left direction. As will be described later, the first protruding portion 71a and the second protruding portion 72a move along the guide hole of the bearing member 51 and the guide hole of the base 11, so that the lateral direction is orthogonal to the extending direction of the contact arm 34. It is possible to suppress the runout of the movable contact 32 along the above, and it is possible to reduce the variation in the breaking performance in the circuit breaker 1. The left-right direction is an example of the second direction.

The first side portion 71 and the second side portion 72 are formed so that their upper ends are continuous with the main body portion 70 and are separated from each other in the left-right direction from the upper end to the lower end. Therefore, as will be described later, the risk of the shunt 36 coming into contact with the burrs at the lower end of the first side portion 71 and the burrs at the lower end of the second side portion 72 can be reduced. Thereby, for example, the molding work of the shunt 36 can be reduced or unnecessary, and the workability when incorporating the shunt 36 can be improved.

Further, the first side portion 71 faces the opening 71b into which the connecting pin 81 is inserted, the opening 71c into which the connecting pin 82 is inserted, the opening 71d into which the connecting pin 83 is inserted, and the inward direction to the left. It has launching portions 71e and 71f that have been launched. The embossed portions 71e and 71f extend in the front-rear direction.

Similar to the first side portion 71, the second side portion 72 includes an opening 72b into which the connecting pin 81 is inserted, an opening 72c into which the connecting pin 82 is inserted, and an opening 72d into which the connecting pin 83 is inserted. It has launching portions 72e and 72f that are launched toward the right side. The embossed portions 72e and 72f extend in the front-rear direction.

As described above, the first side portion 71 and the second side portion 72 are inclined in the left-right direction so as to be separated from each other in the left-right direction from the upper end to the lower end. Launched portions 71e, 71f, 72e, 72f are formed. Therefore, the contact arm 34 can limit the operation of the shunt 36 as compared with the configuration without the launching portions 71e, 71f, 72e, 72f.

Further, a plurality of notches 73a and 73b are formed between the main body 70 and the first side 71, and a plurality of notches 73c and 73d are formed between the main body 70 and the second side 72. .. With the cutouts 73a, 73b, 73c, 73d, stress concentration can be relaxed, and the occurrence of cracks in the bent portion of the contact arm 34 can be suppressed. Thereby, for example, the restriction on the bending direction can be eliminated at the time of manufacturing the contact arm 34, and the press workability can be improved.

Next, the configuration of the bearing member 51 will be described. FIG. 10 is a side view of the bearing member according to the first embodiment. FIG. 11 is a front view of the pair of bearing members according to the first embodiment. FIG. 12 is a top view of the pair of bearing members according to the first embodiment.

The bearing member 51 according to the first embodiment is formed, for example, by performing a punching process, a bending process, a punching process, or the like on a metal plate. As shown in FIG. 10, in the bearing member 51 according to the first embodiment, a convex portion 51a that rotatably supports the handle arm 52, an opening 51b into which the connecting pin 81 is inserted, and a connecting pin 82 are inserted. It has an opening 51c and an opening 51d into which the connecting pin 83 is inserted.

As shown in FIGS. 11 and 12, the pair of bearing members 51 are formed mirror-symmetrically with each other. The pair of bearing members 51 have a pair of guide holes 51e that guide the first protruding portion 71a and the second protruding portion 72a of the contact arm 34 in the second circuit cutoff unit 13B. Each of the pair of guide holes 51e is formed in an arc shape centered on the connecting pin 83 shown in FIG.

As shown in FIGS. 4 to 6, the first protrusion 71a of the contact arm 34 in the second circuit cutoff unit 13B slides a guide hole 51e formed in one of the pair of bearing members 51. Similarly, the first protrusion 71a of the contact arm 34 in the second circuit cutoff unit 13B slides the guide hole 51e formed on the other side of the pair of bearing members 51.

As described above, since the first protruding portion 71a and the second protruding portion 72a of the contact arm 34 in the second circuit breaking unit 13B move along the pair of guide holes 51e, the movable contact along the extending direction of the crossbar 55 The runout of 32 can be suppressed. Therefore, it is possible to reduce the variation in the breaking performance of the circuit breaker 1. In the example shown in FIGS. 10 to 12, the guide hole 51e is a hole that penetrates in the left-right direction, which is the plate thickness direction, but the guide hole 51e is a hole that does not penetrate in the left-right direction, which is the plate thickness direction. May be good.

Next, the configuration of the base 11 will be described. FIG. 13 is a side view of the base according to the first embodiment. Guide holes 111a to 114a are formed in the wall portions 111 to 114 of the base 11 according to the first embodiment, as shown in FIGS. 2 and 13.

Specifically, as shown in FIG. 2, the wall portions 112 and 114 have a pair of guide holes 112a that guide the first protruding portion 71a and the second protruding portion 72a of the contact arm 34 in the first circuit cutoff unit 13A. , 114a are formed. Further, the wall portions 111 and 113 are formed with a pair of guide holes 111a and 113a for guiding the first protruding portion 71a and the second protruding portion 72a of the contact arm 34 in the third circuit cutoff unit 13C. The guide holes 111a, 112a, 113a, 114a are formed in an arc shape centered on the connecting pin 83 shown in FIG.

The first protruding portion 71a and the second protruding portion 72a of the contact arm 34 in the first circuit cutoff unit 13A slide a pair of guide holes 112a and 114a. Further, the first protruding portion 71a and the second protruding portion 72a of the contact arm 34 in the third circuit cutoff unit 13C slide a pair of guide holes 111a and 113a.

As described above, the first protruding portion 71a and the second protruding portion 72a of the contact arm 34 in the first circuit breaking unit 13A and the third circuit breaking unit 13C are formed in the pair of guide holes 112a, 114a and the pair of guide holes 111a, 113a. Move along. Therefore, it is possible to suppress the runout of the movable contact 32 along the extending direction of the crossbar 55. Thereby, the variation in the breaking performance in the circuit breaker 1 can be reduced.

In the above-described example, the base 11 and the bearing member 51 are provided with guide holes, respectively, but the circuit breaker 1 may be configured to provide guide holes only in one of the base 11 and the bearing member 51. good. Further, in the above-described example, the pair of bearing members 51 are arranged in the second storage space 120B, but the circuit breaker 1 arranges the pair of bearing members 51 in the first storage space 120A and the third storage space 120C, respectively. It may be a configuration.

As described above, the circuit breaker 1 according to the first embodiment includes an insulating base 11, a fixed contact 31, a mover 33, a contact arm 34, and a bearing member 51. The fixed contact 31 is supported by the base 11. A movable contact 32 facing the fixed contact 31 is attached to the mover 33. The contact arm 34 extends along the first direction and holds the mover 33 on the distal end side. The bearing member 51 rotatably supports the base end of the contact arm 34 about a rotation axis along a second direction orthogonal to the first direction. The contact arm 34 has a first protruding portion 71a and a second protruding portion 72a that project along the second direction. At least one of the base 11 and the bearing member 51 has a plurality of guide holes for guiding the first protrusion 71a and the second protrusion 72a when the contact arm 34 rotates. The guide holes formed in the base 11 are guide holes 111a, 112a, 113a, 114a, and the guide holes of the bearing member 51 are guide holes 51e. In this way, by providing at least one of the base 11 and the bearing member 51 with a guide function, the opening / closing operation of the opening / closing mechanism portion 14 can be stabilized, and the variation in the breaking performance of the circuit breaker 1 is reduced. be able to.

Further, the contact arm 34 has a main body portion 70, and a first side portion 71 and a second side portion 72 that are bent and extended from one end and the other end of the main body portion 70 in the second direction and face each other. The first side portion 71 and the second side portion 72 extend in a direction away from the main body portion 70. As a result, in the circuit breaker 1, the runout of the movable contact 32 along the extending direction of the crossbar 55 can be accurately suppressed, and the variation in the breaking performance in the circuit breaker 1 can be reduced.

Further, the circuit breaker 1 includes a shunt 36 which is arranged at least a part in a region formed between the first side portion 71 and the second side portion 72 and is connected to the mover 33. The first side portion 71 and the second side portion 72 are formed so that one end thereof is continuous with the main body portion 70 and the crossbar 55 is separated from each other from one end toward the other end. This makes it possible to reduce the risk of the shunt 36 coming into contact with the burrs at the lower ends of the first side portion 71 and the second side portion 72. Therefore, in the circuit breaker 1, for example, the molding work of the shunt 36 can be reduced or unnecessary, and the workability when incorporating the shunt 36 can be improved.

Further, the first side portion 71 and the second side portion 72 have launch portions 71e, 71f, 72e, 72f that are launched in a direction approaching each other. Thereby, the operation of the shunt 36 can be restricted.

Further, the contact arm 34 has a plurality of notches 73a, 73b, 73c, 73d between the main body 70 and the first side 71, and between the main body 70 and the second side 72. Therefore, in the contact arm 34, stress concentration can be relaxed, and the occurrence of cracks in the bent portion of the contact arm 34 can be suppressed. Thereby, for example, the restriction on the bending direction can be eliminated at the time of manufacturing the contact arm 34, and the press workability can be improved.

Further, the base 11 has a plurality of wall portions 111 to 114 extending in the first direction and formed at intervals along the second direction. The first storage space 120A and the second storage space 120A and the second, respectively, in which the first circuit cutoff unit 13A, the second circuit cutoff unit 13B, and the third circuit cutoff unit 13C are housed in order by the plurality of wall portions 111 to 114 along the second direction. A storage space 120B and a third storage space 120C are formed. Each of the first circuit cutoff unit 13A, the second circuit cutoff unit 13B, and the third circuit cutoff unit 13C includes a mover 33 and a contact arm 34. The bearing member 51 is arranged in the second storage space 120B. The contact arms 34 of the first circuit cutoff unit 13A, the second circuit cutoff unit 13B, and the third circuit cutoff unit 13C are connected to each other by a crossbar 55. The pair of wall portions 112 and 114 form a first storage space 120A. The pair of wall portions 111 and 113 form a third storage space 120C. The circuit breaker 1 includes a plurality of guide holes 112a and 114a into which the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the first circuit breaker unit 13A are inserted, and the third circuit breaker unit 13C. A plurality of guide holes 111a and 113a into which the first protrusion 71a and the second protrusion 72a of the contact arm 34 are inserted, and a first contact arm 34 in the second circuit breaker unit 13B formed in the bearing member 51. A plurality of guide holes 51e into which the protruding portion 71a and the second protruding portion 72a are inserted are included. As a result, the contact arm 34 in each circuit breaker unit 13 is guided, so that the variation in the circuit breaker performance in the circuit breaker 1 can be reduced more accurately.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 circuit breaker, 10 housings, 11 bases, 12 covers, 13 circuit breakers, 13A 1st circuit breaker, 13B 2nd circuit breaker, 13C 3rd circuit breaker, 14 open / close mechanism, 15 trip bar, 16 CT, 17 tripping device, 21 power supply side terminal, 22 load side terminal, 23 opening / closing mechanism, 24 arc extinguishing device, 31 fixed contact, 31a arc fixed contact, 31b main fixed contact, 32 movable contact, 32a arc movable contact, 32b main movable contact, 33 mover, 33a arc mover, 33b main mover, 34 contact arm, 35, 35a, 35b contact spring, 36 shunt, 39 fixing member, 41 arc extinguishing chamber, 42 arc runner, 50 handle , 51 bearing member, 51a convex part, 51b, 51c, 51d, 70a, 71b, 71c, 71d, 72b, 72c, 72d opening, 51e, 111a, 112a, 113a, 114a guide hole, 52 handle arm, 53 lower link, 54 upper link, 55 crossbar, 56 shunt, 57 bearing, 58 main spring, 60, 81, 82, 83 connecting pin, 61 trip relay, 62 reset mechanism, 62a connecting plate, 70 main body, 70b, 71e, 71f , 72e, 72f embossed part, 70c mounting hole, 71 first side part, 71a first protruding part, 72 second side part, 72a second protruding part, 73a, 73b, 73c, 73d notch, 111, 112, 113 , 114 wall, 120A first storage space, 120B second storage space, 120C third storage space.

Claims (6)

With an insulating base,
With the fixed contacts supported by the base,
A mover to which a movable contact facing the fixed contact is attached, and
A contact arm that extends along the first direction and holds the mover on the tip side,
A bearing member that rotatably supports the base end of the contact arm about a rotation axis along a second direction orthogonal to the first direction is provided.
The contact arm
It has a plurality of protrusions protruding along the second direction, and has a plurality of protrusions.
At least one of the base and the bearing member
A circuit breaker having a plurality of guide holes for guiding the plurality of protrusions when the contact arm rotates. The contact arm
With the main body
It has a first side portion and a second side portion that are bent and extended from one end and the other end of the main body portion in the second direction and face each other.
The plurality of protrusions
The circuit breaker according to claim 1, further comprising a first protruding portion and a second protruding portion formed on the first side portion and the second side portion and extending in a direction away from the main body portion. A shunt is provided in which at least a part is arranged in a region formed between the first side portion and the second side portion and connected to the mover.
The first side portion and the second side portion
The circuit breaker according to claim 2, wherein each end is continuous with the main body and is formed so as to be separated from each other in the second direction from one end toward the other end. The first side portion and the second side portion
The circuit breaker according to claim 3, further comprising launching portions launched in directions approaching each other. The contact arm
One of claims 2 to 4, wherein a plurality of notches are provided between the main body portion and the first side portion, and between the main body portion and the second side portion. The circuit breaker described. The base is
It has a plurality of wall portions extending in each of the first directions and formed at intervals along the second direction, and the plurality of wall portions interrupt the first circuit in order along the second direction. A first storage space, a second storage space, and a third storage space in which the unit, the second circuit cutoff unit, and the third circuit cutoff unit are housed are formed.
Each of the first circuit breaking unit, the second circuit breaking unit, and the third circuit breaking unit includes the mover and the contact arm.
The bearing member is
Arranged in the second storage space,
The contact arms of the first circuit cutoff unit, the second circuit cutoff unit, and the third circuit cutoff unit are connected to each other by a crossbar.
The plurality of guide holes
Of the plurality of wall portions, the first storage space is formed and formed on a pair of wall portions facing each other, and the first protruding portion and the second protruding portion of the contact arm in the first circuit blocking unit are formed. Multiple guide holes to be inserted respectively,
Of the plurality of wall portions, the third storage space is formed and formed on a pair of wall portions facing each other, and the first protruding portion and the second protruding portion of the contact arm in the third circuit blocking unit are formed. Multiple guide holes to be inserted respectively,
2. The second aspect of the present invention is characterized in that the bearing member includes a plurality of guide holes formed in the bearing member and into which the first protruding portion of the contact arm and the second protruding portion of the contact arm in the second circuit breaker unit are inserted. The circuit breaker according to any one of 5 to 5.

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