breaker

Abstract

Provided is a circuit breaker which restricts excessive rotation by the other end of a thrust bar and is capable of alleviating faults with circuit breakers. The circuit breaker comprises: a contact point part (13); a handle (140) which is rotatably supported; a link mechanism (14), further comprising a thrust bar (143), one end of which is rotatably supported by the handle (140), and a hook part (A) which detachably hooks the other end of the thrust bar (143), said link mechanism (14) making and breaking contact between contact points according to the rotation of the handle (140); trip mechanisms (150, 151) which disengage the hook part (A) and open the contact point part (13) when abnormal current is sensed in the contact point part; and a handle spring (147), one end part (147b) thereof being locked on the device body (10), and which elastically impels the handle (140) toward the open position. A hook protrusion part (141d) applies force that causes the thrust bar (143) to rotate counterclockwise when tripped, and the other end part (147c) of the handle spring (147) is extended to the vicinity of the hook part (A), making contact with the other end of the thrust bar (143) and restricting the rotation of the thrust bar (143).

Description

technical field [0001] The invention relates to a circuit breaker. Background technique [0002] Conventionally, there is a circuit breaker comprising: a body; a contact part arranged in the body; a link mechanism for making contact / separation between the contacts by operating a handle; A trip mechanism that disconnects the contacts through a lever mechanism; and a display component (for example, refer to Japanese Patent Laid-Open No. 2009-212065). [0003] The contact part has a fixed contact and a movable contact that contacts / separates from the fixed contact. [0004] The link mechanism has: a thrust rod, one end of which is pivotally supported on the handle freely; The rotating action brings the movable contact into contact with / disengages from the fixed contact. [0005] Then, when the contacts are forcibly disconnected by the trip mechanism, the engaged state between the engaging portion of the link piece and the other end of the thrust rod is released. At this tim...

AI Technical Summary

Problems solved by technology

[0006] In the circuit breaker of the above-mentioned conventional example, during the tripping operation, the other end of the thrust rod comes into contact with the display member, thereby restricting the excessive rotation of the thrust rod, so that, for example, the circuit breaker may have problems such as damage to the display member.

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