Trip mechanism of selective miniature circuit breaker

Abstract

The invention discloses a tripping mechanism of a selectively miniature circuit breaker, and belongs to the technical field of low-voltage circuit breaker manufacturing. The tripping mechanism comprises a first fixed shaft P, a support piece fixed part, a multi-stage linkage rod, a lock catch, a lock catch torsion spring, a second fixed shaft O and a jumping buckle, wherein the lock catch torsion spring is fixed on the support piece fixed part so as to drive the multi-stage linkage rod or the lock catch to reset; the lock catch torsion spring adopts an integral torsion spring structure with three torsion beam supports, and two original independent torsion spring structures with four torsion beam supports are replaced, so that the reliability of the torsion spring is improved, and the simplicity of the structure is improved. The tripping mechanism realizes that the friction force of an extending plate on the upper end face of the jumping buckle and the upper end face of the lock catch is minimal and can realize switching-on maintenance and quick tripping of the selectively miniature circuit breaker.

Description

technical field [0001] The invention discloses a tripping mechanism, in particular to a tripping mechanism of a selective small circuit breaker, belonging to the technical field of low-voltage circuit breaker manufacture. Background technique [0002] Production and life put forward higher and higher requirements for the safety, reliability and continuity of electricity consumption. In the terminal power distribution system, the selective protection of Miniature Circuit Breaker (SMCB, Selective protection of Miniature Circuit Breaker) is developed because it overcomes the shortcoming of cascaded and coordinated miniature circuit breakers (MCB, Miniature Circuit Breaker) that will trip over the next level when a short-circuit fault occurs. Greatly improved the continuity, stability and reliability of the power supply system. [0003] However, the tripping structure design of the current SMCB operating mechanism, on the one hand, adopts two independent torsion spring structur...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the above-mentioned deficiencies in the background technology, and provide a tripping mechanism for selective miniature circuit breakers. The frictional force between the upper end extension plate of the jumper and the upper end surface of the lock is the smallest, and the selective miniature circuit breaker can be closed and maintained. It solves the technical problem of complex installation structure and poor reliability of the existing tripping mechanism, and also solves the technical problem of the existing tripping mechanism’s large tripping force due to high friction between structures

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