Circuit breaker

Abstract

To provide a circuit breaker that can restrict the movement of the handle by restricting the movement of the link when the contacts are welded, thereby preventing discrepancies between the ON / OFF state indicated by the handle and the open / closed state of the contacts of the circuit breaker.SOLUTION: A circuit breaker includes a fixed contact 8, a movable contact 9 that can come into contact with the fixed contact 8, a push plate 12 that is arranged such that the movable contact 9 can be operated, a link 13 that has one end that can come into contact with the push plate 12, and a handle 4 that is connected to the other end of the link 13 and is arranged such that the push plate 12 can be operated such that the fixed contact 8 and the movable contact 9 come into contact or separate, and when the fixed contact 8 and the movable contact 9 are in a state where they are welded together, the push plate 12 has a restraining portion 12b that contacts the link 13 and restrains the movement of the link 13 by operating the handle 4 such that the fixed contact 8 and the movable contact 9 separate.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to circuit breakers. [Background technology]

[0002] In conventional circuit breakers, a roller, which is part of the mechanism, abuts against a pusher plate that engages with a movable contact conductor to which a movable contact is fixed. In conventional circuit breakers, when a handle, which is part of the mechanism, is operated and rotated, the roller also moves, and the pusher plate moves in conjunction with the movement of the roller. The movement of the pusher plate switches between an ON state in which the fixed contact and the movable contact are in contact, and an OFF state in which the fixed contact and the movable contact are not in contact (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6949254 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional circuit breakers, if the fixed and moving contacts are in a fused state due to heat, the pusher plate, which is linked to the moving contact conductor, cannot move from the ON position. However, because the roller is movably abutting against the pusher plate, the mechanism including the roller and handle can move from the ON position. Therefore, the handle can be operated from the ON position to the OFF position. Therefore, if the handle is operated without knowing that the circuit breaker's contacts are fused, a discrepancy can occur between the ON / OFF state indicated by the handle and the open / closed state of the circuit breaker's contacts.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a circuit breaker that can prevent discrepancies between the ON / OFF state indicated by the handle and the open / closed state of the contacts of the circuit breaker when the contacts are in a welded state. [Means for solving the problem]

[0006] The circuit breaker according to the present disclosure comprises a fixed contact, a movable contact that can come into contact with the fixed contact, a push plate that is arranged so that the movable contact can be operated, a link that is arranged so that one end can come into contact with the push plate, and a handle that is connected to the other end of the link and is arranged so that the push plate can be operated so that the fixed contact and the movable contact can come into contact or separate, and when the fixed contact and the movable contact are in a contact-welded state, the push plate has a restraining portion that restrains movement of the link by bringing the push plate into contact with the link when the handle is operated so that the fixed contact and the movable contact can separate.

[0007] The circuit breaker according to the present disclosure comprises a fixed contact, a movable contact that can come into contact with the fixed contact, a push plate that is arranged so that the movable contact can be operated, a link that is formed in an annular shape and has a portion that can come into contact with the push plate, and a handle that is arranged so that the push plate can be operated to connect a portion of the link that does not come into contact with the push plate and bring the fixed contact and the movable contact into contact or separate, and when the fixed contact and the movable contact are in a state where they are welded together, the push plate has a restraining portion that restrains movement of the link by bringing the push plate into contact with the link when the handle is operated so that the fixed contact and the movable contact are separated. [Effects of the Invention]

[0008] According to the circuit breaker of the present disclosure, when the contacts are in a welded state, it is possible to prevent discrepancies from occurring between the ON / OFF state indicated by the handle and the open / closed state of the contacts of the circuit breaker. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an overall view of a circuit breaker according to a first embodiment. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] 1 is a front view showing the internal configuration of a circuit breaker in a first embodiment in an ON state. [Figure 4] FIG. 4 is a view of FIG. 3 as seen from direction B. [Figure 5] 1 is a front view showing the internal configuration of a circuit breaker in an OFF state according to a first embodiment. [Figure 6] 1 is a front view showing an internal configuration of a circuit breaker in a tripped state according to a first embodiment. [Figure 7] FIG. 2 is a front view of the push plate according to the first embodiment. [Figure 8] 10 is a perspective view showing an internal configuration of a modified example of the circuit breaker in the first embodiment in an ON state. [Figure 9] FIG. 11 is a front view showing the internal configuration of a circuit breaker in a second embodiment in an ON state. [Figure 10] FIG. 11 is a perspective view showing the internal configuration of a circuit breaker in a third embodiment in an ON state. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 The configuration of the circuit breaker 100a according to the first embodiment will be described. Fig. 1 is an overall view of the circuit breaker 100a according to the first embodiment. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. The circuit breaker 100a in Figs. 1 and 2 is in the ON state. Fig. 3 is a front view showing the internal configuration of the circuit breaker 100a according to the first embodiment in the ON state. Fig. 4 is a view of the circuit breaker 100a shown in Fig. 3 as seen from direction B, and is a side view showing the internal configuration of the circuit breaker 100a in the ON state. Fig. 5 is a front view showing the internal configuration of the circuit breaker 100a according to the first embodiment in the OFF state. Fig. 6 is a front view showing the internal configuration of the circuit breaker 100a according to the first embodiment in the tripped state. Fig. 7 is a front view of the push plate 12 according to the first embodiment. In FIG. 1, when the handle 4 is viewed from the front, the direction having the power supply terminal 5 on one side and the load terminal 6 on the other side is called the height direction, the direction having the base 1 on one side and the cover 2 on the other side is called the depth direction, and the direction perpendicular to the height direction in the left-right direction of the page is called the width direction.

[0011] As shown in Fig. 1, the exterior of the circuit breaker 100a is composed of a housing 3 formed by combining a base 1 and a cover 2 made of an insulating material such as plastic, facing each other in the depth direction, a handle 4, a power supply side terminal 5 to which an external electric wire on the power supply side is connected, and a load side terminal 6 to which an external electric wire on the load side is connected. Details of the handle 4 will be described later. The base 1 and cover 2 may have a structure other than that in which they are combined facing each other in the depth direction, and may, for example, be combined facing each other in the width direction.

[0012] As shown in FIG. 2, the interior of the circuit breaker 100a is composed of a power supply side terminal 5, a load side terminal 6, a mechanism part 7 including a handle 4, a fixed contact 8, a movable contact 9, a movable contact conductor 10, a shaft 10a, a push plate 12, and a break spring 18.

[0013] The mechanism 7 is made up of a handle 4, a shaft 4a of the handle 4, a frame 11, a link 13, a latch 14, a shaft 14a of the latch 14, a trip bar 15, and a shaft 15a of the trip bar. The mechanism 7 engages with a push plate 12 via the link 13, and is provided so that the push plate 12 can be operated by the handle 4 via the link 13.

[0014] The handle 4 is made of an insulating material such as plastic, and is attached to a shaft 4a provided in the mechanism 7 as shown in FIG. 2 so as to rotate about the shaft 4a. The handle 4 is also provided so as to be able to operate a push plate 12 so as to bring the fixed contact 8 and the movable contact 9 into contact with or separate from each other. The handle 4 protrudes from the cover 2 to the outside of the housing 3 so as to enable switching between an ON state (FIG. 3) in which the fixed contact 8 and the movable contact 9 of the circuit breaker 100a are in contact with each other, and an OFF state (FIG. 5) in which the fixed contact 8 and the movable contact 9 are not in contact with each other (open state). As shown in FIG. 2, the handle 4 described in this embodiment is provided so that when tilted toward the power supply side terminal 5 in the height direction, the circuit breaker 100a is turned ON, and when tilted toward the load side terminal 6 in the height direction, the circuit breaker 100a is turned OFF.

[0015] The handle 4 is provided with a display unit (not shown) so that the ON or OFF state can be visually recognized from the outside. The display unit is, for example, a sticker, and is attached to the handle 4. The sticker that is the display unit may have a red background with "ON" printed in white letters to indicate the ON state, and may have a green background with "OFF" printed in white letters to indicate the OFF state. The display unit is not limited to a sticker, and may be printed or engraved directly on the handle 4, for example. The content of the display unit is not limited as long as the ON or OFF state can be visually recognized from the outside.

[0016] The frame 11 is made of metal or resin, and as shown in Fig. 2, holds the shafts 4a, 14a, and 15a of the handle 4, latch 14, and trip bar 15, respectively. Each shaft may be formed by providing a protrusion on the frame 11, or may be formed by inserting a pin as a separate part.

[0017] Link 13 is made of metal or resin, and engages handle 4 and pressure plate 12 as shown in Fig. 2. As shown in Figs. 3 and 4, link 13 is U-shaped, and the other end of link 13 on the cover 2 side in the depth direction is rotatably inserted into a hole in handle 4 and connected to handle 4. One end of link 13 on the base 1 side in the depth direction is arranged so as to be able to come into contact with pressure plate 12. As shown in Fig. 3, a roller 16 may be attached to one end of link 13 to improve wear resistance when in contact with pressure plate 12.

[0018] 6, when the circuit breaker 100a is in a tripped state, one end of the link 13 is separated from the push plate 12. Here, the tripped state will be explained. In the tripped state, an overcurrent or short-circuit current flows when the circuit breaker 100a is in the ON state, and the movable contact 9 is separated from the fixed contact 8 to interrupt the overcurrent or short-circuit current. The operation of the tripped state is as follows: First, when an overcurrent or short-circuit current is detected, a trip relay (not shown) is activated, causing the trip bar 15 and latch 14 to rotate. The rotation of the latch 14 moves one end of the link 13, and the one end of the link 13 loses contact with the push plate 12. Then, the push plate 12 is lifted toward the cover 2 in the depth direction by the biasing force of the separation spring 18. In conjunction with this, the movable contact conductor 10 and the movable contact 9 also rise, and the fixed contact 8 and the movable contact 9 lose contact. Furthermore, when one end of the link 13 moves, the biasing force of a return spring (not shown) attached to the handle 4 moves the position of the handle 4 from the position in the ON state to between the positions in the ON state and the OFF state.

[0019] The latch 14 is made of metal or resin and rotates around a shaft 14a. When the circuit breaker 100a is in a tripped state, the latch 14 maintains the circuit in an interrupted state.

[0020] The trip bar 15 is made of metal or resin and rotates around an axis 15a. The trip bar 15 operates to separate the movable contact 9 from the fixed contact 8 in order to trip the circuit breaker 100a. When the circuit breaker 100a is in the ON state, the latch 14 and the trip bar 15 are in contact at an engaging portion 17, as shown in FIG. 3. When the circuit breaker 100a changes from the ON state to the trip state, the latch 14 and the trip bar 15 are disengaged from each other at the engaging portion 17, and the latch 14 is pushed by the trip bar 15 to rotate, reaching the state shown in FIG. 6.

[0021] The circuit breaker 100a is electrically conductive when the fixed contact 8 and the movable contact 9 come into contact with each other. The fixed contact 8 is a metal contact fixed to the power supply terminal 5 inside the housing 3. The movable contact 9 is a metal contact fixed to a movable contact conductor 10 made of a conductive metal and provided inside the housing 3. As shown in Figures 2 and 3, the movable contact conductor 10 rotates around a shaft 10a provided at the other end of the movable contact conductor 10 on the load terminal 6 side in the height direction. The movable contact conductor 10 is inserted into the push plate 12 so that it can move in conjunction with the push plate 12. It is also possible to provide a protrusion on the power supply terminal 5 without fixing the fixed contact 8 to it, and have the protrusion function as the fixed contact.

[0022] The push plate 12 is made of an insulating material such as resin to insulate the movable contact conductor 10 from the mechanism 7. The push plate 12 is arranged so as to be able to move in conjunction with the movable contact conductor 10, and is provided so as to be able to operate the movable contact 9 fixed to the movable contact conductor 10. Note that the push plate 12 may also be provided so as to be able to operate the movable contact 9 directly, without going through the movable contact conductor 10.

[0023] 3 and 7, the pusher plate 12 has a push-in portion 12a and a restraint portion 12b that form part of a U-shaped cutout portion 12d on the side of the power supply terminal 5 in the height direction, and a pusher plate body 12c that holds the plate having the cutout portion 12d. Note that the pusher plate body 12c does not have to be formed separately from the plate having the cutout portion 12d, but may be formed integrally with it.

[0024] The pushing portion 12a is formed so as to push in one end of the link 13. When the pushing portion 12a is pushed in, the push plate 12 moves and the contact points come into contact. Note that the pushing portion 12a does not have to be configured as part of the cutout portion 12d, and may be formed as a surface that faces the link 13 in the depth direction of the push plate 12, for example.

[0025] 3, when the circuit breaker 100a is in a welded state, and the handle 4 is operated to be in the OFF state, that is, when the fixed contact 8 and the movable contact 9 are operated to be separated, the restraining portion 12b is formed so as to come into contact with one end of the link 13. Note that the restraining portion 12b does not have to be configured as part of the cutout portion 12d, and may be formed by combining another member with the side surface of the push plate 12, for example.

[0026] The separation spring 18 is attached to the movable contact conductor 10, and separates the movable contact conductor 10 from the fixed contact by its biasing force. When the circuit of the circuit breaker 100a is closed, the force of the link 13 in the direction of pressing the push plate 12 is greater than the biasing force of the separation spring 18, so the separation spring 18 maintains the state in which the movable contact 9 is in contact with the fixed contact 8. When the circuit of the circuit breaker 100a is open, the separation spring 18 functions to separate the movable contact 9 fixed to the movable contact conductor 10 from the fixed contact.

[0027] Next, the operation of the circuit breaker 100a in the first embodiment will be described for the cases of switching from the OFF state to the ON state, from the ON state to the OFF state, and from the fused contact state to the OFF state. Here, the fused contact state refers to a state in which the fixed contact 8 and the movable contact 9 are in contact and fixed in a fused state due to heat. In the fused contact state, the circuit breaker 100a is in the ON state.

[0028] The operation of the circuit breaker 100a when changing from the OFF state shown in Fig. 5 to the ON state shown in Fig. 3 will be described. First, when the handle 4 is tilted in the height direction toward the power supply side terminal 5 to set the circuit breaker 100a to the ON state, the handle 4 rotates about the shaft 4a. When the handle 4 is operated, one end of the link 13 is pressed into the pressing portion 12a, and the link 13 presses the presser plate 12 toward the base 1 in the depth direction while resisting the biasing force of the breaker spring 18. When the presser plate 12 is pressed, the movable contact conductor 10 and the movable contact 9 are also pressed toward the base 1 in the depth direction, so that the fixed contact 8 and the movable contact 9 come into contact with each other, the circuit breaker 100a is conductive, and the circuit breaker 100a is set to the ON state.

[0029] Next, the operation of the circuit breaker 100a when changing from the ON state shown in Fig. 3 to the OFF state shown in Fig. 5 will be described. First, when the handle 4 is tilted toward the load side terminal 6 in the height direction to change to the OFF state, the handle 4 rotates around the shaft 4a. When the handle 4 is operated, the other end of the link 13 is pulled by the handle 4 toward the source side terminal 5. Then, in conjunction with the push plate 12, the link 13 is lifted toward the cover 2 in the depth direction by the biasing force of the break spring 18. When the push plate 12 is lifted, the movable contact conductor 10 and the movable contact 9 also lift, and the fixed contact 8 and the movable contact 9 are separated, resulting in loss of continuity in the circuit breaker 100a and the circuit breaker 100a changing to the OFF state.

[0030] As described above, when the circuit breaker 100a is operated from the OFF state to the ON state or from the ON state to the OFF state, the ON / OFF state indicated by the handle 4 matches the open / closed state of the contacts of the circuit breaker 100a.

[0031] Next, we will explain the operation of the circuit breaker 100a when switching from the welded contact state to the OFF state. In the welded contact state, the circuit breaker is in the ON state shown in FIG. 3 , and the fixed contact 8 and the movable contact 9 are not separated. First, when the handle 4 is tilted vertically toward the load terminal 6 to switch to the OFF state, the handle 4 rotates around the shaft 4a. When the handle 4 is operated, the other end of the link 13 is pulled by the handle 4 toward the source terminal 5. As the other end of the link 13 is pulled, one end of the link 13 comes into contact with the restraining portion 12b. Here, the push plate 12 cannot move in conjunction with the link 13 because the contacts are in the welded state. Therefore, the restraining portion 12b, which is part of the push plate 12, restrains the one end of the link 13 from moving toward the cover 2 in the depth direction. Because the movement of the link 13 is restricted in this way, the handle 4, which is connected to the link 13, is also restricted from moving to the OFF state.

[0032] As described above, when the circuit breaker 100a is operated to change from the welded contact state to the OFF state, the handle 4 is held in a position indicating the ON state. Therefore, when the contacts are in the welded contact state, the ON / OFF state indicated by the handle 4 matches the open / closed state of the contacts of the circuit breaker 100a.

[0033] As described above, the circuit breaker 100a according to the first embodiment comprises a fixed contact 8, a movable contact 9 that can come into contact with the fixed contact 8, a push plate 12 that is arranged to operate the movable contact 9, a link 13 that is arranged so that one end can come into contact with the push plate 12, and a handle 4 that is connected to the other end of the link 13 and is arranged to operate the push plate 12 so that the fixed contact 8 and the movable contact 9 come into contact or separate. When the fixed contact 8 and the movable contact 9 are in a contact-welded state, the handle 4 is operated so that the fixed contact 8 and the movable contact 9 separate, and the push plate 12 has a restraining portion 12b that restrains the movement of the link 13 by causing the push plate 12 to come into contact with the link 13. Therefore, when the contacts are in a contact-welded state, the movement of the link 13 is restrained, thereby suppressing the movement of the handle 4, and preventing a discrepancy between the ON / OFF state indicated by the handle 4 and the contact opening / closing state of the circuit breaker 100a.

[0034] 3 and 5, when a restraining portion 12b is provided so that the movement of the link 13 is restrained by contacting one end of the link 13, the portion of the link 13 that comes into contact with the push plate 12 can be determined to be only one end. This simplifies the shape of the link 13, making it easy to save material and shorten the manufacturing time.

[0035] The location of contact of restraint portion 12b does not have to be limited to one end of link 13, and restraint portion 12b may come into contact with any part of link 13 as long as it can restrain the movement of link 13 in the contact welding state.

[0036] Furthermore, in the circuit breaker 100a according to embodiment 1, the push plate 12 has a cutout portion 12d, and the restraint portion 12b and the pushing portion 12a formed to push in one end of the link 13 constitute part of the cutout portion 12d, thereby eliminating the need to add new components and reducing the number of parts constituting the push plate 12.

[0037] In the first embodiment, the two-pole circuit breaker 100a shown in Figs. 2 to 6 has been described, but the circuit breaker 100a operates in the same manner even if the number of poles is increased.

[0038] In a circuit breaker 100a having multiple poles, for example, the contacts of only one pole may be in a welded state. In this case, when the handle 4 is turned to the OFF position, the push plates 12 of the other poles that are not welded will tend to rise as usual, but the push plate 12 of the welded pole will be held in the ON position, so that the welded pole becomes the lowest point on the base 1 side in the depth direction of the restraining portion 12b, and the link 13 is restrained. Therefore, even in this case, movement of the handle 4 can be suppressed, making it possible to prevent damage to the equipment and malfunctions.

[0039] In the first embodiment, the circuit breaker 100a is described as having one movable contact 9 and one fixed contact 8 for each pole, but it may be configured such that each pole has a plurality of movable contacts 9 and a plurality of fixed contacts 8.

[0040] Note that a portion of the pusher plate 12 may be made of a conductor such as metal. FIG. 8 is a perspective view showing the internal configuration of a circuit breaker 100b, which is a modification of the circuit breaker 100a according to the first embodiment, in the ON state. The pusher plate 112 in the circuit breaker 100b includes a lower pusher plate 112a having the function of the pusher plate body 12c according to the first embodiment, and an upper pusher plate 112b corresponding to the pushing portion 12a and the restraining portion 12b. Here, the upper pusher plate 112b is not provided to insulate the movable contact conductor 10 from the mechanism unit 7, and therefore may be made of a conductor such as metal. Furthermore, for example, if the upper pusher plate 112b is made of metal and the lower pusher plate 112a is made of resin, they may be joined by insert molding. Furthermore, the strength of the upper pusher plate 112b may be made greater than that of the lower pusher plate 112a to prevent stress concentration on the U-shaped portion of the U-shaped cutout portion 12d according to the first embodiment of the upper pusher plate 112b, which would otherwise be damaged.

[0041] Embodiment 2 9 is a front view showing the internal configuration of the circuit breaker 100c in the second embodiment in the ON state, and is a diagram showing the configuration of the push plate 212. The push plate 212 in the third embodiment differs from the push plate 12 in the first embodiment in that the pushing portion 12a and the restraining portion 12b in the first embodiment are configured as part of one hole 212a.

[0042] 9, one end of link 13 is disposed in hole 212a. By disposing link 13 in this manner, even if the position of link 13 is shifted due to vibration during opening and closing operations, for example, link 13 and push plate 212 can be prevented from coming out of contact.

[0043] As described above, in the circuit breaker 100c according to the second embodiment, the push plate 212 has a hole 212a, one end of the link 13 is disposed in the hole 212a, and the restraint portion 12b and the pushing portion 12a formed to push in one end of the link 13 constitute part of the hole 212a, thereby enabling one end of the link 13 to be always disposed within the hole 212a. This makes it possible to prevent the link 13 from shifting position and the link 13 and the push plate 212 from coming out of contact with each other, thereby increasing the operational stability of the circuit breaker 100b.

[0044] Embodiment 3 Fig. 10 is a perspective view showing the internal configuration of the circuit breaker 100d according to the third embodiment in the ON state, and is a diagram showing the configuration of the push plate 312 and the link 313. The push plate 312 according to the third embodiment differs from the push plate 12 according to the first embodiment in that the push-in portion 12a, the restraining portion 12b, and the push plate main body 12c according to the first embodiment are integrally formed. Furthermore, the configurations corresponding to the push-in portion 12a and the restraining portion 12b according to the first embodiment are integrally formed as the notch portion 312a. Furthermore, the link 313 according to the third embodiment differs from the link 13 according to the first embodiment in that it is formed in an annular shape.

[0045] 10, notch 312a is arranged so as to catch on a part of annular link 313. By arranging it in this manner, even if link 313 is displaced due to vibration during opening and closing operations, for example, link 313 comes into contact with the side surface of push plate 312, and link 313 does not fall out of notch 312a.

[0046] As described above, the device comprises fixed contact 8, movable contact 9 that can come into contact with fixed contact 8, push plate 312 that is arranged to operate movable contact 9, link 313 that is formed in an annular shape and that is arranged so that a portion of link 313 can come into contact with push plate 312, and handle 4 that is arranged to operate push plate 312 so that a portion of link 313 that does not come into contact with push plate 312 is connected and fixed contact 8 and movable contact 9 come into contact or separate, and when fixed contact 8 and movable contact 9 are in a contact-welded state, push plate 12 has restraining portion 12b that contacts link 313 and restrains movement of link 313 by operating handle 4 so that fixed contact 8 and movable contact 9 separate. Therefore, even if link 313 is misaligned, link 313 comes into contact with the side surface of push plate 312, and link 313 can be prevented from falling out of notch 312a.

[0047] The shape of link 313 does not have to be strictly circular, as long as it is close to a circular shape. For example, it may be a square shape as shown in Fig. 10. If link 313 has corners, such as a square, the corners of link 313 will come into contact with push plate 12, so it is desirable to perform processing such as rounding to smooth the corners of link 313.

[0048] 10, an opening 313a may be provided in a part of the link 313. By providing the opening 313a, when assembling the circuit breaker 100d, the push plate 312 can be positioned by moving along the opening 313a. This eliminates the need to move the entire link 313 when positioning the link 313 and the push plate 312, making the positioning work easier.

[0049] The configurations shown in the above embodiments are examples of the contents of the present disclosure. The embodiments can be combined with other known technologies. Part of the configurations of the embodiments can be omitted or modified without departing from the gist of the present disclosure. [Explanation of symbols]

[0050] 1 base, 2 cover, 3 housing, 4 handle, 4a axis, 5 power supply terminal, 6 load side terminal, 7 mechanism part, 8 fixed contact, 9 moving contact, 10 moving contact conductor, 10a shaft, 11 frame, 12 push plate, 12a push portion, 12b restraint portion, 12c push plate body, 12d cutout portion, 13 link, 14 latch, 14a shaft, 15 trip bar, 15a shaft, 16 roller, 17 engagement portion, 18 release spring, 100a, 100b, 100c, 100d circuit breaker, 112 push plate, 112a lower push plate, 112b upper push plate, 212 push plate, 212a hole, 312 push plate, 312a cutout portion, 313 link, 313a opening

Claims

1. A fixed contact; a movable contact that can come into contact with the fixed contact; a push plate provided to be able to operate the movable contact; a link provided so that one end can come into contact with the push plate; a handle to which the other end of the link is connected and which is provided to be able to operate the push plate so that the fixed contact and the movable contact come into contact with or separate from each other; Equipped with When the fixed contact and the movable contact are in a contact-welded state, The push plate has a restraining portion that restrains movement of the link by operating the handle so that the fixed contact and the movable contact are separated, and the push plate comes into contact with the link. Circuit breaker.

2. The restraint portion is The one end of the link contacts the other end of the link, thereby restricting movement of the link.

10. The circuit breaker of claim 1.

3. The push plate has a notch, The restraining portion and a pushing portion formed to push the one end of the link constitute a part of the notch portion.

3. The circuit breaker according to claim 1 or 2.

4. The push plate has holes, the one end of the link is disposed in the hole; The restraint portion and the pushing portion formed to push the one end of the link constitute a part of the hole.

3. The circuit breaker of claim 2.

5. A fixed contact; a movable contact that can come into contact with the fixed contact; a push plate provided to be able to operate the movable contact; a link formed in an annular shape, a portion of which is provided so as to be able to come into contact with the push plate; In the link, a part of a portion that does not contact the push plate is connected, a handle provided to operate the push plate so that the fixed contact and the movable contact come into contact with or separate from each other; Equipped with When the fixed contact and the movable contact are in a contact-welded state, The push plate has a restraining portion that restrains movement of the link by operating the handle so that the fixed contact and the movable contact are separated, and the push plate comes into contact with the link. Circuit breaker.

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