JP2019212389A - Circuit breaker - Google Patents

Abstract

To provide a circuit breaker capable of reducing variation in cut-off performance.SOLUTION: A circuit breaker 1 comprises: an insulative base 11; a fixed contact 31 supported on the base 11; a movable element 33 to which a movable contact 32 facing the fixed contact 31 is fitted; a contact arm 34 which extends in a first direction and holds the movable element 33 at a distal end side; and a bearing member 51 which supports a proximal end of the contact arm 34 in a manner rotatable around a rotation axis in a second direction perpendicular to the first direction. The contact arm 34 has a plurality of protrusions which protrude in the second direction. At least one of the base 11 and the bearing member 51 has a plurality of guide holes which guide the plurality of protrusions when the contact arm 34 rotates.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a circuit breaker such as a circuit breaker for wiring and a circuit breaker.

  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 distal end side, and a bearing that rotatably supports the base end of the contact arm A circuit breaker comprising a member is known. In such a circuit breaker, the contact arm rotates with the opening / closing operation of the handle, whereby the movable contact and the fixed contact are brought into contact with and separated from each other.

Japanese Utility Model Publication No. 1-134349

  Since the conventional circuit breaker is supported only at the base end of the contact arm, the movable contact held on the contact arm via the mover on the tip side can swing along the direction perpendicular to the extending direction of the contact arm. There is. Therefore, the contact position between the movable contact and the fixed contact is not stable, and the interruption performance may vary.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the circuit breaker which can reduce the dispersion | variation in interruption | blocking performance.

  In order to solve the above-described problems and achieve the object, a circuit breaker according to the present invention includes an insulating base, a fixed contact supported by the base, and a movable element to which a movable contact facing the fixed contact is attached. And a contact arm that extends along the first direction and holds the movable element on the distal end side, and a base end of the contact arm is supported rotatably about a rotation axis along a second direction orthogonal to the first direction. A bearing member. The contact arm has a plurality of protrusions protruding 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 when the contact arm rotates.

  According to the present invention, it is possible to reduce the variation in blocking performance.

The partial perspective front view which saw through a part of circuit breaker concerning Embodiment 1 of the present invention transparently The front view of the base of the circuit breaker concerning Embodiment 1 A cross-sectional view along the line III-III shown in FIG. The figure for demonstrating the OFF state of the circuit breaker concerning Embodiment 1. The figure for demonstrating the ON state of the circuit breaker concerning Embodiment 1. The figure for demonstrating the trip state of the circuit breaker concerning Embodiment 1. FIG. Top view of contact arm according to the first exemplary embodiment. The side view of the contact arm concerning Embodiment 1 The front view of the contact arm concerning Embodiment 1. The side view of the bearing member concerning Embodiment 1. The front view of a pair of bearing member concerning Embodiment 1 A top view of a pair of bearing members according to the first embodiment. Side view of the base according to the first exemplary embodiment

  Below, the circuit breaker concerning embodiment of this invention is demonstrated in detail based on drawing. Note that the present invention is not limited to the embodiments.

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

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

  The circuit breaker 1 shown in FIG. 1 is, for example, a wiring breaker or a ground fault breaker. The circuit breaker 1 includes a casing 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. Prepare. In FIG. 1, the first circuit breaker unit 13 </ b> A is hidden behind the cover 12 and cannot be seen.

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

  As shown in FIG. 2, the base 11 has a plurality of wall portions 111 to 114 that extend in the front-rear direction and are formed at intervals along 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.

  A 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 order along the left-right direction. 120 A of 1st storage spaces are formed between the wall part 112 and the wall part 114, and 13 A of 1st circuit interruption | blocking units are accommodated. The second storage space 120B is formed between the wall portion 114 and the wall portion 113, and stores the second circuit breaking unit 13B. The third storage space 120C is formed between the wall 113 and the wall 111, and stores the third circuit breaking unit 13C.

  As shown in FIG. 3, each circuit breaker 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 referred to as a power supply side, and the load side terminal 22 side of the circuit breaker 1 may be referred to as a load side. In FIG. 3, the cross section other than the housing 10 is not hatched.

  The opening / closing mechanism 23 includes a fixed contact 31, a movable contact 32, a mover 33, a contact arm 34, a contact pressure spring 35, and a shunt 36. The fixed contact 31 is fixed to one end of the power supply side terminal 21 and 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 movable element 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, each circuit breaking unit 13 is provided with a plurality of sets of main fixed contacts 31b and main movable contacts 32b. The number of sets of the main fixed contact 31b and the main movable contact 32b is, for example, four.

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

  The contact arm 34 extends along the front-rear direction. The contact arm 34 has a distal end side connected to the base end of the movable element 33 by a connecting pin 81 and holds the base end of the movable element 33 rotatably. 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-rear direction, which is the extending direction of the contact arm 34, is an example of the first direction.

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

  The shunt 36 has one end electrically connected to the load side terminal 22 and the other end connected to the mover 33. The movable element 33 is electrically connected to the load side terminal 22 by the shunt 36. The shunt 36 is composed of a plurality of independent flexible conductors, for example.

  The arc extinguishing device 24 is disposed above the arc extinguishing chamber 41 for cutting an arc generated between the fixed contact 31 and the movable contact 32, and the power supply side terminal 21, and between the fixed contact 31 and the movable contact 32. And 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 14 that opens and closes a three-phase electric circuit, a trip bar 15 that trips the opening / closing mechanism 14, a CT (Current Transformer) 16 that detects a current flowing in the electric circuit, and a CT 16. And a tripping device 17 for driving the trip bar 15 based on the electric current.

  The opening / closing mechanism unit 14 is attached to the opening / closing mechanism 23 of the three circuit breaker units 13 described above, the operation handle 50, the pair of bearing members 51, and the handle 50, and its lower end portion is rotatable to the bearing member 51. And a supported handle arm 52. The base end of the contact arm 34 is attached to the pair of bearing members 51 via a connecting pin 83, and the contact arm 34 extends in the left-right direction of the connecting pin 83 by the pair of bearing members 51 and the connecting pin 83. The wire is supported so as to be rotatable about a rotation axis.

  Further, the opening / closing mechanism section 14 is attached to the contact arm 34 of the second circuit breaker unit 13 </ b> B with one end rotatably attached to the other end of the lower link 53 and one end rotatably attached to the other end of the lower link 53 by the connecting pin 60. And an upper link 54. Note that one end of the lower link 53 is rotatably attached to a central portion in the front-rear direction of the contact arm 34 by a connecting pin 82.

  Further, the opening / closing mechanism portion 14 is rotatably supported at one end by the cross bar 55 attached to the proximal end of the handle arm 52 by the fixing member 39 and the bearing member 51, and at the other end of the upper link 54. A cradle 56 attached thereto. The opening / closing mechanism unit 14 includes a receiver 57 that engages with the other end of the cradle 56, and a main spring 58 that has one end attached to the upper end of the handle arm 52 and the other end attached to the connecting pin 60.

  Of the opening / closing mechanism 14, the handle 50, the bearing member 51, the handle arm 52, the lower link 53, the upper link 54, the cradle 56, the catch 57, and the main spring 58 are provided in the second storage space 120B shown in FIG. Be placed. The cross bar 55 extends in the left-right direction from the first storage space 120A to the third storage space 120C, and is disposed across the first storage space 120A, the second storage space 120B, and the third storage space 120C. The The contact arm 34 of the first circuit breaker unit 13A and the contact arm 34 of the third circuit breaker unit 13C are connected to the contact arm 34 of the second circuit breaker unit 13B by a cross bar 55.

  The trip device 17 includes a trip relay 61 and a reset mechanism 62. The trip relay 61 operates based on the current detected by the CT 16 and detects an overcurrent or leakage of the electric circuit. The reset mechanism 62 places the trip device 17 in a 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. 4 to 6, illustration of the contact pressure spring 35 and the like is omitted.

  First, the closing operation of the circuit breaker 1 will be described. When the handle 50 shown in FIG. 3 is moved from the trip state shown in FIG. 6 in which the spring force is not accumulated in the main spring 58 to the load side, the circuit breaker 1, as shown in FIG. Is engaged with the catch 57, and the spring force is accumulated in the main spring 58.

  Further, the contact arm 34 of the second circuit breaker unit 13B is rotated in a direction in which the tip is directed upward with the connecting pin 83 as a center. As the contact arm 34 of the second circuit breaker unit 13B rotates, the contact arm 34 of the first circuit breaker unit 13A and the contact arm 34 of the third circuit breaker unit 13C are moved by the crossbar 55 to the second circuit breaker 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 supports the convex portion 51a of the bearing member 51. Rotate to. As a result, as shown in FIG. 5, the main spring 58 is inclined in the direction toward the power source, and the contact arm 34 of each circuit breaker unit 13 is rotated about the connecting pin 83 by the spring force accumulated in the main spring 58. As the contact arm 34 of each circuit breaker unit 13 rotates, the fixed contact 31 and the movable contact 32 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, the trip relay 61 detects an overcurrent or a leakage based on the current output from the CT 16 and starts its operation when an overcurrent or a leakage occurs. When the trip relay 61 starts to operate, the connecting plate 62a of the reset mechanism 62 shown in FIG. 3 pushes 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 movable element 33 provided on the tip side of each circuit breaker unit 13 is centered on the connecting pin 83 by the biasing force of the contact pressure spring 35 shown in FIG. As shown in FIG. For this reason, separation between the movable contact 32 and the fixed contact 31 starts, 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. The arc is attracted to the arc extinguishing chamber 41 by the arc runner 42 and extinguished in the arc extinguishing chamber 41. Thereby, the circuit breaker 1 will be 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 variation in 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 exemplary 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 includes a flat plate-like main body portion 70, a first side that is bent downward from one end and the other end in the left-right direction of the main body portion 70, extends downward, and faces each other. Part 71 and second side part 72. 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 part of the shunt 36 is disposed in a region between the first side portion 71 and the second side portion 72.

  The main body portion 70 is formed with an opening 70a into which the lower link 53 is inserted, a launching portion 70b that is launched downward, and a plurality of attachment holes 70c for attaching the fixing member 39 for fixing the cross bar 55. The

  The 1st side part 71 has the 1st protrusion part 71a extended | stretched along the right direction which is a direction away from the main-body part 70 in a lower end. Further, the second side portion 72 has a second projecting portion 72a extending at the left side in the direction away from the main body portion 70 at the lower end. As will be described later, the first projecting portion 71a and the second projecting portion 72a move along the guide hole of the bearing member 51 and the guide hole of the base 11, so that the left and right direction is a direction orthogonal to the extending direction of the contact arm 34. And the fluctuation of the breaking performance of the circuit breaker 1 can be reduced. The left-right direction is an example of the second direction.

  The first side portion 71 and the second side portion 72 are each formed such that the upper ends thereof are continuous with the main body portion 70 and are separated from each other in the left-right direction from the upper end toward the lower end. Therefore, as will be described later, it is possible to reduce the risk that the shunt 36 comes into contact with the bottom edge of the first side portion 71 and the bottom edge of the second side portion 72. Thereby, for example, the molding work of the shunt 36 can be reduced or unnecessary, and the workability when the shunt 36 is incorporated can be improved.

  The first side portion 71 has an opening 71b into which the connecting pin 81 is inserted, an opening 71c into which the connecting pin 82 is inserted, an opening 71d into which the connecting pin 83 is inserted, and an inward leftward direction. And launching portions 71e and 71f that have been launched. The projecting portions 71e and 71f extend in the front-rear direction.

  Similarly 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, an opening 72d into which the connecting pin 83 is inserted, And launching portions 72e and 72f that are launched in the right direction. The launching 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 toward the lower end. Launched portions 71e, 71f, 72e, 72f are formed. Therefore, the contact arm 34 can restrict the operation of the shunt 36 as compared with the configuration without the launching portions 71e, 71f, 72e, 72f.

  In addition, a plurality of notches 73 a and 73 b are formed between the main body 70 and the first side 71, and a plurality of notches 73 c and 73 d are formed between the main body 70 and the second side 72. . Such notches 73a, 73b, 73c, and 73d can alleviate stress concentration and suppress the occurrence of cracks in the bent portions of the contact arm 34. Thereby, for example, the restriction of the bending direction can be eliminated when the contact arm 34 is manufactured, 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 a pair of bearing members according to the first embodiment. FIG. 12 is a top view of a 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 connection pin 81 is inserted, and a connection 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 in mirror symmetry with each other. The pair of bearing members 51 have a pair of guide holes 51e for guiding the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the second circuit breaker unit 13B. Each of the pair of guide holes 51e is formed in an arc shape centering on the connecting pin 83 shown in FIG.

  As shown in FIGS. 4 to 6, the first protrusion 71 a of the contact arm 34 in the second circuit breaker unit 13 </ b> B slides in a guide hole 51 e formed in one of the pair of bearing members 51. Similarly, the 1st protrusion part 71a of the contact arm 34 in the 2nd circuit interruption | blocking unit 13B slides the guide hole 51e formed in the other of a pair of bearing member 51. FIG.

  Thus, since the 1st protrusion part 71a and the 2nd protrusion part 72a of the contact arm 34 in the 2nd circuit interruption | blocking unit 13B move along a pair of guide hole 51e, the movable contact along the extending | stretching direction of the crossbar 55 is carried out. 32 shakes can be suppressed. Therefore, the variation in the breaking performance in the circuit breaker 1 can be reduced. In the example shown in FIGS. 10 to 12, the guide hole 51e is a hole that penetrates in the left-right direction that is the plate thickness direction, but the guide hole 51e is a hole that does not penetrate in the left-right direction that is the plate thickness direction. Also 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. As shown in FIGS. 2 and 13, guide holes 111a to 114a are formed in the walls 111 to 114 of the base 11 according to the first embodiment.

  Specifically, as shown in FIG. 2, the walls 112 and 114 have a pair of guide holes 112a for guiding the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the first circuit breaker unit 13A. , 114a are formed. The walls 111 and 113 are formed with a pair of guide holes 111a and 113a for guiding the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the third circuit breaking unit 13C. These guide holes 111a, 112a, 113a, 114a are formed in an arc shape centering on the connecting pin 83 shown in FIG.

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

  As described above, the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the first circuit breaker unit 13A and the third circuit breaker unit 13C are formed into a pair of guide holes 112a and 114a and a pair of guide holes 111a and 113a. Move along. Therefore, the swing of the movable contact 32 along the extending direction of the cross bar 55 can be suppressed. Thereby, the dispersion | variation in the interruption | blocking performance in the circuit breaker 1 can be reduced.

  In the above-described example, the base 11 and the bearing member 51 are each provided with a guide hole. However, the circuit breaker 1 may be configured so that only one of the base 11 and the bearing member 51 is provided with a guide hole. Good. In the example described above, the pair of bearing members 51 are arranged in the second storage space 120B. However, 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 the insulating base 11, the fixed contact 31, the mover 33, the contact arm 34, and the bearing member 51. The fixed contact 31 is supported by the base 11. The movable contact 33 is attached to the movable element 33 so as to face the fixed contact 31. The contact arm 34 extends along the first direction and holds the mover 33 on the tip side. The bearing member 51 supports the base end of the contact arm 34 so as to be rotatable about a rotation axis along a second direction orthogonal to the first direction. The contact arm 34 has a first protrusion 71a and a second protrusion 72a that protrude along the second direction. At least one of the base 11 and the bearing member 51 has a plurality of guide holes that guide 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. Thus, by providing at least one of the base 11 and the bearing member 51 with a guide function, it is possible to stabilize the opening / closing operation in the opening / closing mechanism section 14 and to reduce the variation in the breaking performance in the circuit breaker 1. be able to.

  Further, the contact arm 34 includes 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 in the second direction of the main body portion 70 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. Thereby, in the circuit breaker 1, the swing of the movable contact 32 along the extending direction of the crossbar 55 can be suppressed with high accuracy, and the variation in the breaking performance in the circuit breaker 1 can be reduced.

  Further, the circuit breaker 1 includes a shunt 36 that is disposed at least partially in a region formed between the first side portion 71 and the second side portion 72 and connected to the mover 33. The first side portion 71 and the second side portion 72 are each formed such that one end is continuous with the main body portion 70 and is separated from each other in the extending direction of the crossbar 55 as it goes from one end to the other end. Thereby, the risk that the shunt 36 comes into contact with the bottom edge of the first side portion 71 and the second side portion 72 can be reduced. Therefore, in the circuit breaker 1, for example, the molding work of the shunt 36 can be reduced or eliminated, and the workability when the shunt 36 is incorporated can be improved.

  Moreover, the 1st side part 71 and the 2nd side part 72 have the launch parts 71e, 71f, 72e, and 72f stamped toward the direction which mutually approaches. Thereby, the operation of the shunt 36 can be limited.

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

  The base 11 has a plurality of wall portions 111 to 114 that extend in the first direction and are formed at intervals along the second direction. The first storage space 120A and the second storage space in which the first circuit breaker unit 13A, the second circuit breaker unit 13B, and the third circuit breaker unit 13C are respectively housed in order along the second direction by the plurality of walls 111 to 114. A storage space 120B and a third storage space 120C are formed. Each of the first circuit breaker unit 13A, the second circuit breaker unit 13B, and the third circuit breaker unit 13C includes a mover 33 and a contact arm 34. The bearing member 51 is disposed in the second storage space 120B. The contact arms 34 of the first circuit breaker unit 13A, the second circuit breaker unit 13B, and the third circuit breaker unit 13C are connected to each other by a cross bar 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 projecting portion 71a and the second projecting portion 72a of the contact arm 34 in the first circuit breaker unit 13A are inserted, and a third circuit breaker unit 13C. The first protrusion 71a and the second protrusion 72a of the contact arm 34 are formed in the plurality of guide holes 111a and 113a into which the first protrusion 71a and the second protrusion 72a are respectively inserted, and the bearing member 51, and the first arm of the contact arm 34 in the second circuit breaker unit 13B. It includes a plurality of guide holes 51e into which the protrusions 71a and the second protrusions 72a are inserted. Thereby, since the contact arm 34 in each circuit interruption | blocking unit 13 is guided, the dispersion | variation in interruption | blocking performance in the circuit breaker 1 can be reduced more accurately.

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

  1 circuit breaker, 10 housing, 11 base, 12 cover, 13 circuit breaker unit, 13A first circuit breaker unit, 13B second circuit breaker unit, 13C third circuit breaker unit, 14 opening / closing mechanism, 15 trip bar, 16 CT, 17 trip 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 movable element, 33a arc movable element, 33b main movable element, 34 contact arm, 35, 35a, 35b contact pressure spring, 36 shunt, 39 fixing member, 41 arc extinguishing chamber, 42 arc runner, 50 handle , 51 bearing member, 51a convex portion, 51b, 51c, 51d, 0a, 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 cradle, 57 catch, 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 launching 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 part, 111, 112, 113, 114 wall part, 120A first storage space, 120B second storage Space, 120C third storage space.

Claims (6)

An insulating base;
A fixed contact supported by the base;
A mover provided with a movable contact facing the fixed contact;
A contact arm extending along the first direction and holding the mover on the tip side;
A bearing member that rotatably supports a base end of the contact arm about a rotation axis along a second direction orthogonal to the first direction;
The contact arm is
A plurality of protrusions protruding along the second direction;
At least one of the base and the bearing member is
A circuit breaker comprising a plurality of guide holes for guiding the plurality of protrusions when the contact arm rotates. The contact arm is
The main body,
A first side and a second side that are bent and extended from one end and the other end in the second direction of the main body, and are opposed to each other;
The plurality of protrusions are
2. The circuit breaker according to claim 1, comprising: a first protrusion and a second protrusion that are formed on the first side and the second side and extend in a direction away from the main body. A shunt disposed at least partially in a region formed between the first side and the second side and connected to the mover;
The first side and the second side are:
3. The circuit breaker according to claim 2, wherein each of the circuit breakers is formed such that one end thereof is continuous with the main body portion and is separated from the other in the second direction from one end to the other end. The first side and the second side are:
The circuit breaker according to claim 3, further comprising a launching unit that is launched in a direction approaching each other. The contact arm is
5. The apparatus according to claim 2, further comprising: a plurality of cutout portions between the main body portion and the first side portion and between the main body portion and the second side portion. Circuit breaker as described. The base is
Each of the plurality of wall portions extending in the first direction and spaced apart along the second direction has a plurality of wall portions, and the first circuit cutoff is sequentially performed along the second direction by the plurality of wall portions. 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 respectively stored;
Each of the first circuit breaker unit, the second circuit breaker unit, and the third circuit breaker unit includes the mover and the contact arm,
The bearing member is
Arranged in the second storage space,
The contact arms of each of the first circuit breaker unit, the second circuit breaker unit, and the third circuit breaker unit are connected to each other by a crossbar,
The plurality of guide holes are
Of the plurality of wall portions, the first projecting portion and the second projecting portion of the contact arm are formed on a pair of wall portions that form the first storage space and face each other. A plurality of guide holes each inserted;
Of the plurality of walls, the first protrusion and the second protrusion of the contact arm are formed on a pair of walls that form the third storage space and face each other. A plurality of guide holes each inserted;
3. A plurality of guide holes formed in the bearing member and into which the first projecting portion and the second projecting portion of the contact arm in the second circuit breaking unit are inserted. To 5. The circuit breaker according to any one of 5 to 5.