Circuit breaker with N pole free of arc-extinguishing device

Abstract

The invention discloses a circuit breaker with an N pole free of an arc-extinguishing device. The circuit breaker comprises an N pole circuit breaker and an adjacent live wire circuit breaker; an N pole circuit breaker tripping linkage rod is arranged in the N pole circuit breaker; and the N pole circuit breaker tripping linkage rod and an adjacent live wire circuit breaker tripping linkage rod form a crossed mutual insertion structure. By adopting the trigger design that the adjacent live wire circuit breaker tripping linkage rod of the adjacent live wire circuit breaker and the N pole circuit breaker tripping linkage rod of the N pole circuit breaker form the crossed mutual insertion structure, the adjacent live wire circuit breaker is ensured to be tripped first; and after a contact ofthe adjacent live wire circuit breaker is separated, when a contact mechanism of the adjacent live wire circuit breaker is about to move to an end point, the N pole circuit breaker tripping linkage rod of the N pole circuit breaker is triggered to act, so that the contact of the N pole circuit breaker does not generate an electric arc, the purpose of disconnecting the N pole circuit breaker laterthan the adjacent live wire circuit breaker is achieved, and it is not required to replace parts and redesign the contact mechanism of the N pole.

Description

technical field [0001] The invention relates to the field of electrical switches, in particular to a circuit breaker with an N pole without an arc extinguishing device. Background technique [0002] When the switch contacts cut off the current or turn on and off with load, they will generate an arc, which is dangerous and harmful. Now each stage of the multi-pole circuit breaker with N poles on the market is equipped with a contact arc extinguishing device. , because it is not sure which pole circuit breaker contacts will be closed first when closing, and which pole circuit breaker will be disconnected last when tripping. If the mechanical structure design of the circuit breaker can ensure that the N pole circuit breaker It has a reliable first-make-before-break function. In terms of anti-seismic (prevention of accidental tripping) performance, the tripping sensitivity of live wire circuit breakers is better than that of N poles, and the arc extinguishing device of N poles c...

AI Technical Summary

Problems solved by technology

[0003] Existing N-pole circuit breakers without arc extinguishing devices often adopt the method of increasing contact overtravel in the design of making first and then breaking. This method has the disadvantages of not obvious time difference between first making and then breaking and the need to change the contact pressure

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