Circuit breaker

Abstract

A circuit break includes a trip protection mechanism, the tripping protection mechanism comprises a bimetal sheet and an armature which is buckled and matched with the operating mechanism, pole bootsspaced apart from the armature are arranged on the bimetal, one end of the armature is provided with a spring piece connected with one end of the bimetal piece, the bimetal can drive the other end ofthe armature when it is bent, At that time of overload, the bimetal sheet bends to drive the armature to release and cooperate with the buckle of the operating mechanism, the electromagnetic force ofthe pole shoe attracts the armature to release the snap fit with the operating mechanism when the pole shoe is short-circuited, As that armature are respectively connected with the operate mechanism,Bimetal and pole shoe fit, The armature can not only cooperate with the operating mechanism to play the role of locking, but also cooperate with the bimetal and pole shoe to realize the functions of overload protection and short circuit protection respectively. The armature is cleverly designed to combine the overload protection and short circuit protection together reasonably, and has the characteristics of small occupying space, small number of parts and low production cost.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker. Background technique [0002] The circuit breaker is an important part of the electrical industry and has been widely used. When the electrical circuit is working normally, the circuit breaker can achieve functions such as power failure, power supply and conversion circuit by closing or disconnecting the circuit that supplies electric energy; When abnormalities such as overload and short circuit occur in the circuit, the circuit breaker will trip to cut off the electrical circuit, so as to avoid endangering the safety of workers and the normal operation of equipment due to circuit failure. [0003] Existing circuit breakers usually implement overload protection and short circuit protection through overload protection mechanism and electromagnetic system. Most of the overload protection mechanisms use the characteristics of bimetal components. C...

AI Technical Summary

Problems solved by technology

Overload protection and short-circuit protection are realized through two mechanisms, not only the number of parts is large, the production process is many, the structure is complex, the cost of the product is very high, and it takes up a lot of space, which is not conducive to the miniaturization of the circuit breaker, and there is a shortage of products in the fierce commercial competition. Competitiveness

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