KR20190136939A - Circuit breaker - Google Patents

Abstract

The present invention is to obtain a circuit breaker that can reduce variations in breaking performance. The circuit breaker (1) comprises an insulating base (11); a fixed contact (31) supported by the base (11); a mover (33) equipped with a movable contact (32) facing the fixed contact (31); a contact arm (34) which is extended along the first direction and holds the mover (33) at a front end side; and a bearing member (51) which rotatably supports the base end of the contact arm (34) about a rotation axis in a second direction orthogonal to the first direction. The contact arm (34) has a plurality of protrusion parts protruding 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 plurality of protrusion parts when the contact arm (34) rotates.

Description

Circuit breaker

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

As disclosed in Patent Literature 1, a mover equipped with a movable contact opposed to a fixed contact, a contact arm holding the mover at the distal end side, and a bearing rotatably supporting the base end of the contact arm. Circuit breakers having members are known. In such a circuit breaker, a contact arm rotates according to the opening-closing operation of a handle, and contact and opening of a movable contact and a fixed contact are performed.

Patent Document 1: Japanese Utility Model Publication No. Hei 1-134349

In the conventional circuit breaker, only the proximal end of the contact arm is supported, so that the movable contact held via the mover at the distal end side of the contact arm may swing along the direction orthogonal to the stretching direction of the contact arm. Therefore, the contact position between a movable contact and a fixed contact may not be stabilized, and a breakage performance may occur in some cases.

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

In order to solve the above problems and achieve the object, the circuit breaker of the present invention includes a movable base having an insulating base, a fixed contact supported on the base, and a movable contact opposed to the fixed contact, and a first direction. The contact arm extends along the side and maintains a movable part at the front end side, and the bearing member rotatably supports the base end of the contact arm about the rotation axis along the 2nd direction orthogonal to a 1st direction. 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, there is an effect that the variation in the breaking performance can be reduced.

1 is a partial perspective front view showing a part of a circuit breaker according to Embodiment 1 of the present invention.
2 is a front view of the base of the circuit breaker according to the first embodiment.
It is sectional drawing seen from the arrow along the III-III line shown in FIG.
4 is a diagram for explaining an off state of the circuit breaker according to the first embodiment.
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. FIG.
7 is a top view of the contact arm according to the first embodiment.
8 is a side view of the contact arm according to the first embodiment.
9 is a front view of a contact arm according to the first embodiment.
10 is a side view of a bearing member according to the first embodiment.
11 is a front view of a pair of bearing members according to the first embodiment.
12 is a top view of a pair of bearing members according to the first embodiment.
13 is a side view of the base according to the first embodiment.

EMBODIMENT OF THE INVENTION Below, the circuit breaker which concerns on embodiment of this invention is demonstrated in detail based on drawing. In addition, this invention is not limited by this embodiment.

Embodiment 1.

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

Hereinafter, for the convenience of explanation, the coordinates of the XYZ axis are given in the drawings. In the coordinates of the XYZ axis, the Z-axis positive direction is the upper 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, The Y-axis positive direction is the front side direction, and the Y-axis negative direction is the rear side direction.

The circuit breaker 1 shown in FIG. 1 is a wiring breaker or an earth leakage breaker, for example. The circuit breaker 1 includes a case 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 first one. Three circuit interruption unit 13C is provided. In addition, in FIG. 1, 13 A of 1st circuit interrupting units are in the state which cannot be hidden by the cover 12. In addition, in FIG.

The first circuit breaker unit 13A, the second circuit breaker unit 13B, and the third circuit breaker unit 13C are arranged in parallel with each other on the base 11 of the case 10 and are in three phases. The electrical circuit of the three phases of alternating current is cut off. Hereinafter, when each of the 1st circuit interruption unit 13A, the 2nd circuit interruption unit 13B, and the 3rd circuit interruption unit 13C is shown without distinguishing, it may describe as the circuit interruption unit 13. .

As shown in FIG. 2, the base 11 extends in the front-back direction, respectively, and has the some wall part 111-114 formed at intervals along the left-right direction. The wall parts 111 and 112 are outer wall parts, and the wall parts 113 and 114 are partition wall parts.

The plurality of wall portions 111 to 114 form the first storage space 120A, the second storage space 120B, and the third storage space 120C in order along the left and right directions. 120 A of 1st storage spaces are formed between the wall part 112 and the wall part 114, and the 1st circuit interruption unit 13A is accommodated. The 2nd accommodating space 120B is formed between the wall part 114 and the wall part 113, and the 2nd circuit interruption unit 13B is accommodated. The 3rd accommodating space 120C is formed between the wall part 113 and the wall part 111, and the 3rd circuit interruption unit 13C is accommodated.

As shown in FIG. 3, each circuit breaker unit 13 includes a power supply side terminal 21 connected to a power supply side wire (not shown), a load side terminal 22 connected to a load side wire (not shown), and opening and closing of an electric circuit. And an extinguishing device 24 for cutting the arc. Hereinafter, the power supply side terminal 21 side of the circuit breaker 1 may be described as a power supply side, and the load side terminal 22 side of the circuit breaker 1 may be described as a load side. 3, hatching is not given to cross sections other than the case 10. In FIG.

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

The movable contact 32 opposes the fixed contact 31 and is fixed to the movable element 33. This 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. In addition, although not shown in figure, in each circuit interruption unit 13, the plurality of main fixed contact 31b and the main movable contact 32b set are provided. The number of the main fixed contact 31b and the main movable contact 32b set is four, for example.

As for the movable element 33, the movable contact 32 is fixed. 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 front-back direction. This contact arm 34 is connected to the proximal end of the movable element 33 by the connecting pin 81, and the proximal end of the movable element 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 such a contact arm 34 will be described later. Moreover, the front-back direction which is the extending direction of the contact arm 34 is an example of a 1st direction.

The contact spring 35 is placed over the movable member 33 and the contact arm 34, and is connected between the fixed contact 31 and the movable contact 32 with the connecting pin 81 as a point. Apply contact pressure. The contact spring 35 includes a contact spring 35a placed over the arc mover 33a and the contact arm 34, and a contact spring placed over the main mover 33b and the contact arm 34. 35b).

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

The arc extinguisher 24 is arrange | positioned above the arc extinguishing chamber 41 which cuts out the arc which arises between the stationary contact 31 and the movable contact 32, and the power supply side terminal 21, and is fixed stationary 31 ) And an arc runner 42 for guiding the arc generated between the movable contact 32 and the arc contact chamber 41.

The circuit breaker 1 includes an opening / closing mechanism portion 14 for opening and closing a three-phase electric circuit, a trip bar 15 for tripping the opening and closing mechanism portion 14, and a CT for detecting a current flowing through the electrical circuit ( And a trip device 17 for driving the trip bar 15 based on the current detected by the CT 16.

The opening / closing mechanism part 14 is attached to the opening / closing mechanism 23 of the three circuit breaker units 13 mentioned above, the handle 50 for operation, the pair of bearing members 51, and the handle 50. And a lower end portion having a handle arm 52 rotatably supported by the bearing member 51. The base end of the contact arm 34 is attached to the pair of bearing members 51 via the connecting pin 83, and the contact arm (the arm) is connected by the pair of bearing members 51 and the connecting pin 83. 34 is rotatably supported using the center line extending in the left-right direction of the connecting pin 83 as a rotation axis.

Moreover, the opening / closing mechanism part 14 has the lower link 53 which one end was rotatably attached to the contact arm 34 of the 2nd circuit interruption unit 13B, and the one end is connected to the other end of the lower link 53 one end. An upper link 54 rotatably mounted by 60. Moreover, one end of the lower link 53 is rotatably attached to the center part in the front-back direction of the contact arm 34 by the connection pin 82. As shown in FIG.

In addition, the opening / closing mechanism part 14 is rotatably supported by the cross bar 55 attached to the base end of the handle arm 52 by the fixing member 39 and the bearing member 51 so that one end is rotatable. 54 is provided with a cradle 56 rotatably mounted at the other end of the center portion. In addition, the opening / closing mechanism part 14 includes a main spring (one end of which is attached to the other end of the cradle 56 and the receiving bracket 57 and the upper end of the handle arm 52, and the other end of which is attached to the connecting pin 60 ( 58).

Moreover, among the opening / closing mechanism part 14, the handle 50, the bearing member 51, the handle arm 52, the lower link 53, the upper link 54, the cradle 56, the receiving bracket 57, and The main spring 58 is arrange | positioned at the 2nd accommodating space 120B shown in FIG. In addition, the cross bar 55 extends from the first storage space 120A to the third storage space 120C in the horizontal direction, and includes the first storage space 120A, the second storage space 120B, and It is arranged over the third storage space 120C. 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 of the second circuit breaker unit 13B by the cross bar 55. 34).

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 of an electric circuit is detected based on the current detected by the CT 16. The reset mechanism 62 sets the trip device 17 to a reset state.

Next, the operation of the circuit breaker 1 will be described. 4 is a diagram for explaining an off state of the circuit breaker according to the first embodiment. 5 is a diagram for explaining an on state of the circuit breaker according to the first embodiment. 6 is a diagram for explaining a tripping state of the circuit breaker according to the first embodiment. 4-6, illustration of the contact spring 35 etc. is abbreviate | omitted.

First, the closing operation of the circuit breaker 1 will be described. As shown in FIG. 4, when the handle 50 shown in FIG. 3 is moved to the load side direction from the tripping state shown in FIG. 6 in which the spring force is not accumulated in the main spring 58, the circuit breaker 1 is shown in FIG. Since the cradle 56 is engaged with the receiving bracket 57, the spring force is accumulated in the main spring 58.

Moreover, the contact arm 34 of the 2nd circuit breaker unit 13B is rotated in the direction which the front-end | tip faces upwards centering on the connection pin 83. As shown in FIG. In accordance with the rotation of the contact arm 34 of the second circuit breaker unit 13B, the cross bar 55 of the contact arm 34 and the third circuit breaker unit 13C of the first circuit breaker unit 13A. The contact arm 34 rotates in the same direction as the contact arm 34 of the second circuit breaking unit 13B.

As for the circuit breaker 1, when the handle 50 shown in FIG. 3 is moved to the direction of a power supply side from the state shown in FIG. 4, the handle arm 52 attached to the handle 50 will be carried out of the bearing member 51. As shown in FIG. The convex part 51a is rotated to a point. Thereby, as shown in FIG. 5, the main spring 58 inclines in the direction of a power supply side, and the contact arm 34 of each circuit interruption unit 13 is prevented by the spring force accumulated in the main spring 58. As shown in FIG. It rotates about the connection pin 83. As shown in FIG. By the rotation of the contact arm 34 of each circuit interruption unit 13, the fixed contact 31 and the movable contact 32 come into contact, and an electric circuit is closed.

Next, the interruption | blocking operation | movement of the circuit breaker 1 is demonstrated. In the circuit breaker 1 in the state shown in FIG. 5, the trip relay 61 detects an overcurrent or a short circuit based on a current output from the CT 16 when an overcurrent or a short circuit occurs, and starts an operation. . By the start of operation of the trip relay 61, 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 receiving bracket 57 is released.

When the engagement between the cradle 56 and the receiving bracket 57 is released, the mover 33 provided on the front end side of each circuit interruption unit 13 is connected by the pressing force of the contact spring 35 shown in FIG. The pin 83 is rotated in a direction away from the fixed contact 31. Therefore, opening of the movable contact 32 and the fixed contact 31 starts, and an arc generate | occur | produces between the movable contact 32 and the fixed contact 31. FIG. And, as the opening between the movable contact 32 and the fixed contact 31 increases, the arc increases greatly. This arc is attracted to the arc-extinguishing chamber 41 by the arc runner 42, and arc-extinguishing in the arc-extinguishing chamber 41 is carried out. As a result, the circuit breaker 1 is in a trip state.

In the circuit breaker 1 which concerns on Embodiment 1, the contact arm 34, the bearing member 51, and the base 11 have the structure for reducing the dispersion | variation in breaking performance. Hereinafter, the structure of the contact arm 34, the structure of the bearing member 51, and the structure of the base 11 are demonstrated in order.

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

As shown in FIGS. 7-9, the contact arm 34 is bent from the one end and the other end in the left and right directions in the body portion 70 and the other end in the main body portion 70, and is stretched downward to face each other. And a first side portion 71 and a second side portion 72. Such a contact arm 34 is formed by, for example, punching, bending, drawing out, etc. on a metal plate. At least a part of the shunt 36 is disposed in the region between the first side portion 71 and the second side portion 72.

The main body portion 70 includes an opening 70a into which the lower link 53 is inserted, a punching portion 70b projected downward, and a fixing member 39 for fixing the cross bar 55. A plurality of mounting holes 70c are formed.

The 1st side part 71 has the 1st protrusion part 71a extended | stretched along a right direction as a direction falling from the main body part 70 in a lower end. Moreover, the 2nd side part 72 has the 2nd protrusion part 72a extended along a left direction as the direction which falls from the main body part 70 in a lower end. As described later, the first protrusion 71a and the second protrusion 72a move along the guide hole of the bearing member 51 and the guide hole of the base 11 to be orthogonal to the stretching direction of the contact arm 34. The shaking of the movable contact 32 along the left-right direction which is a direction can be suppressed, and the dispersion | variation in the breaking performance in the circuit breaker 1 can be reduced. Moreover, the left-right direction is an example of a 2nd direction.

The 1st side part 71 and the 2nd side part 72 are each formed so that an upper end may continue in the main-body part 70, and they may mutually separate from left and right directions from the upper end to the lower end. Therefore, as described later, the risk of the shunt 36 coming into contact with the burr at the lower end of the first side part 71 and the burr at the lower end of the second side part 72 can be reduced. Thereby, for example, the shaping | molding operation | work of the shunt 36 can be reduced or unnecessary, and also the workability at the time of assembling the shunt 36 can be improved.

The first side portion 71 includes an opening 71b into which the connecting pin 81 is inserted, an opening 71c into which the connecting pin 82 is inserted, and an opening 71d into which the connecting pin 83 is inserted. And the projecting portions 71e and 71f projected toward the leftward direction. The projecting parts 71e and 71f are extended 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 a connecting pin 83. The opening 72d is inserted, and the projecting portions 72e and 72f are projected toward the inside rightward direction. The projecting parts 72e and 72f are extended 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, but as described above, the contact arm 34 is a projecting part. 71e, 71f, 72e, 72f are formed. Therefore, the contact arm 34 can limit the operation of the shunt 36 as compared with the structure without the projecting parts 71e, 71f, 72e, 72f.

Moreover, the some notch part 73a, 73b is formed between the main body part 70 and the 1st side part 71, and the several notch part (between the main body part 70 and the 2nd side part 72) is formed. 73c, 73d) are formed. By such notch portions 73a, 73b, 73c, 73d, stress concentration can be alleviated and generation of cracks in the bent portion in the contact arm 34 can be suppressed. Thereby, for example, the limitation of a bending direction can be removed at the time of manufacture of the contact arm 34, and press workability can be improved.

Next, the structure of the bearing member 51 is demonstrated. 10 is a side view of the bearing member according to the first embodiment. 11 is a front view of a pair of bearing members according to the first embodiment. 12 is a top view of a pair of bearing members according to the first embodiment.

The bearing member 51 which concerns on Embodiment 1 is formed by performing a punching process, a bending process, a drawing process, etc. to a metal plate, for example. As shown in FIG. 10, the bearing member 51 which concerns on Embodiment 1 has the convex part 51a which rotatably supports the handle arm 52, the opening 51b in which the connecting pin 81 is inserted, And an opening 51c into which the connecting pin 82 is inserted, and an opening 51d into which the connecting pin 83 is inserted.

As shown to FIG. 11 and FIG. 12, the pair of bearing members 51 are formed in mirror symmetry with each other. The pair of bearing members 51 provide 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. Has) Each of the pair of guide holes 51e is formed in an arc shape centering on the connecting pin 83 shown in FIG. 3.

As shown to FIG. 4 thru | or 6, the 1st protrusion part 71a of the contact arm 34 in the 2nd circuit interruption unit 13B is the guide hole 51e formed in one of the pair of bearing members 51. As shown in FIG. Slide). Similarly, the 1st protrusion part 71a of the contact arm 34 in the 2nd circuit breaker unit 13B slides the guide hole 51e formed in the other of the pair of bearing members 51. As shown in FIG.

Thus, since the 1st protrusion part 71a and the 2nd protrusion part 72a of the contact arm 34 in the 2nd circuit interruption unit 13B move along a pair of guide hole 51e, a cross bar ( The deviation of the movable contact 32 along the extending direction of 55 can be suppressed. Therefore, the variation of the breaking performance in the circuit breaker 1 can be reduced. In addition, in the example shown to FIG. 10 thru | or 12, the guide hole 51e is a hole which penetrates in the left-right direction which is a plate thickness direction, but the guide hole 51e may be a hole which does not penetrate in the left-right direction which is a plate thickness direction. .

Next, the structure of the base 11 is demonstrated. 13 is a side view of the base according to the first embodiment. In the wall portions 111 to 114 of the base 11 according to the first embodiment, guide holes 111a to 114a are formed as shown in FIGS. 2 and 13.

Specifically, as shown in FIG. 2, the wall portions 112 and 114 guide the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the first circuit breaker unit 13A. A pair of guide holes 112a and 114a are formed. In the wall portions 111 and 113, a pair of guide holes 111a for guiding the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the third circuit interruption unit 13C, 113a) is formed. These guide holes 111a, 112a, 113a, 114a are formed in circular arc shape centering on the connecting pin 83 shown in FIG.

The 1st protrusion part 71a and the 2nd protrusion part 72a of the contact arm 34 in 13 A of 1st circuit interrupting units slide a pair of guide hole 112a, 114a. Moreover, the 1st protrusion part 71a and the 2nd protrusion part 72a of the contact arm 34 in 3rd circuit interrupting unit 13C slide a pair of guide hole 111a, 113a.

In this way, the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the first circuit breaking unit 13A and the third circuit breaking unit 13C have a pair of guide holes 112a, 114a) and a pair of guide holes 111a and 113a. Therefore, the deviation of the movable contact 32 along the extending direction of the cross bar 55 can be suppressed. Thereby, the dispersion | variation in the breaking performance in the circuit breaker 1 can be reduced.

Moreover, in the above-mentioned example, although the guide hole was provided in the base 11 and the bearing member 51, respectively, the circuit breaker 1 provides a guide hole only in one of the base 11 and the bearing member 51. FIG. It may be a configuration. Moreover, in the above-mentioned example, although the pair of bearing members 51 were arrange | positioned in the 2nd accommodating space 120B, the circuit breaker 1 provided the pair of bearing members 51 in the 1st accommodating space 120A. And the arrangement arranged in the third storage space 120C, respectively.

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. It is provided. The fixed contact 31 is supported by the base 11. The movable element 33 is equipped with the movable contact 32 which opposes the fixed contact 31. The contact arm 34 extends along the first direction and holds the movable element 33 at the front end side. The bearing member 51 supports the base end of the contact arm 34 so as to be rotatable about a rotation axis in 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 for guiding the first protrusion 71a and the second protrusion 72a when the contact arm 34 rotates. The guide hole formed in the base 11 is guide hole 111a, 112a, 113a, 114a, and the guide hole of the bearing member 51 is the guide hole 51e. In this way, by providing a guide function to at least one of the base 11 and the bearing member 51, stabilization of the opening / closing operation in the opening / closing mechanism part 14 can be attained, and the deviation of the breaking performance in the circuit breaker 1 can be achieved. Can be reduced.

In addition, the contact arm 34 bends and extends from the one end and the other end in the second direction in the main body portion 70 and the main body portion 70, respectively, and faces the first side portion 71 and the second side portion ( 72). The first side portion 71 and the second side portion 72 extend in the direction away from the main body portion 70. Thereby, in the circuit breaker 1, the shake of the movable contact 32 along the extending direction of the cross bar 55 can be suppressed precisely, and the deviation of the breaking performance in the circuit breaker 1 can be reduced. Can be.

Moreover, the circuit breaker 1 is equipped with the shunt 36 arrange | positioned at least one part in the area | region formed between the 1st side part 71 and the 2nd side part 72, and is connected to the movable element 33. As shown in FIG. . Each of the first side portion 71 and the second side portion 72 is formed such that one end of the first side portion 71 and the second side portion 72 are separated from each other in the stretching direction of the cross bar 55 as the first side continues from the one end to the other end. Thereby, the risk that the shunt 36 contacts the burrs of the lower end in the 1st side part 71 and the 2nd side part 72 can be reduced. Therefore, in the circuit breaker 1, the shaping | molding operation | work of the shunt 36 can be reduced or unnecessary, for example, and the workability at the time of assembling the shunt 36 can be improved.

Moreover, the 1st side part 71 and the 2nd side part 72 have the projecting part 71e, 71f, 72e, 72f which were projected toward the direction which mutually approached. As a result, the operation of the shunt 36 can be limited.

In addition, the contact arm 34 includes a plurality of notches 73a and 73b between the body portion 70 and the first side portion 71, and between the body portion 70 and the second side portion 72. 73c, 73d). Therefore, in the contact arm 34, stress concentration can be alleviated and generation | occurrence | production of the crack of the curved part in the contact arm 34 can be suppressed. Thereby, for example, the limitation of a bending direction can be removed at the time of manufacture of the contact arm 34, and press workability can be improved.

Moreover, the base 11 extends in a 1st direction, respectively, and has the some wall part 111-114 formed at intervals along a 2nd direction. By the plurality of wall portions 111 to 114, the first circuit breaker unit 13A, the second circuit breaker unit 13B, and the third circuit breaker unit 13C are respectively accommodated in order along the second direction. The first storage space 120A, the second storage space 120B, and the third storage space 120C are formed. Each of the first circuit interruption unit 13A, the second circuit interruption unit 13B, and the third circuit interruption unit 13C includes a mover 33 and a contact arm 34. The bearing member 51 is arrange | positioned at the 2nd accommodating 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 the first storage space 120A. The pair of wall portions 111 and 113 form the 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, respectively. And a plurality of guide holes 111a and 113a into which the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the third circuit breaking unit 13C are inserted, respectively, and the bearing member 51. And a plurality of guide holes 51e into which the first protrusion 71a and the second protrusion 72a of the contact arm 34 in the second circuit breaker unit 13B are inserted. Thereby, since the contact arm 34 in each circuit interruption unit 13 is guided, the dispersion | variation in the interruption | blocking performance in the circuit breaker 1 can be reduced more accurately.

The structure shown in the above embodiment shows an example of the content of the present invention, and may be combined with other well-known techniques, and a part of the structure may be omitted or changed without departing from the gist of the present invention. It is possible.

1: circuit breaker 10: case
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 and closing mechanism 15 trip bar
16: CT 17: trip device
21: power supply terminal 22: load side terminal
23: opening and 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: Pressure spring 36: Shunt
39: fixed member 41: arc room
42: arc runner 50: handle
51 bearing member 51a convex portion
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: cross bar
56 cradle 57: receiving bracket
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: punching part
70c: mounting hole 71: first side
71a: first protrusion 72: second side
72a: 2nd protrusion part 73a, 73b, 73c, 73d: notch part
111, 112, 113, 114: wall portion 120A: first storage space
120B: second storage space 120c: third storage space

Claims (6)

With an insulating base,
A fixed contact supported on the base,
A mover equipped with a movable contact opposed to the fixed contact,
A contact arm extending along the first direction and holding the mover at the tip side;
A bearing member for rotatably supporting a base end of the contact arm about a rotation axis in a second direction orthogonal to the first direction,
The contact arm,
Has a plurality of protrusions protruding along the second direction,
At least one of the base and the bearing member,
And a plurality of guide holes for guiding the plurality of protrusions when the contact arm rotates. The method according to claim 1,
The contact arm,
With the body part,
Each of the first side and the second side which are bent and extended from the one end and the other end of the second direction in the main body portion and face each other,
The plurality of protrusions,
And a first protrusion and a second protrusion formed on the first side and the second side and extending in a direction away from the main body. The method according to claim 2,
At least a part is disposed in an area formed between the first side and the second side, and has a shunt connected to the mover,
The first side and the second side,
Circuit breakers, characterized in that one end is continuous with the main body and further away from each other in the second direction from one end to the other end. The method according to claim 3,
The first side and the second side,
A circuit breaker comprising a projecting portion projected toward a direction approaching each other. The method according to any one of claims 2 to 4,
The contact arm,
And a plurality of notches between the body portion and the first side portion and between the body portion and the second side portion. The method according to any one of claims 2 to 4,
The base is,
A plurality of wall portions each extending in the first direction and spaced along the second direction, wherein the plurality of wall portions sequentially block the first circuit blocking unit and the second circuit in the second direction; A first accommodating space, a second accommodating space, and a third accommodating space, in which the unit and the third circuit interrupting unit are accommodated, respectively, are formed,
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,
Disposed 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 cross bar,
The plurality of guide holes,
A plurality of wall portions are formed in a pair of wall portions which form the first storage space and face each other, and each of the first protrusion and the second protrusion of the contact arm in the first circuit breaker unit are inserted. With guide holes,
A plurality of wall portions are formed in a pair of wall portions which form the third storage space and face each other, and each of the first protrusion and the second protrusion of the contact arm in the third circuit breaker unit are inserted. With guide holes,
And a plurality of guide holes formed in the bearing member and into which the first protrusion and the second protrusion of the contact arm in the second circuit blocking unit are inserted.

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