Trip reset structure of circuit breaker and drawbar

Abstract

The invention relates to a drop-out reset structure of a draw bar. The drop-out reset structure of a draw bar includes a support, a draw bar on the support, and an elastic reset element on the supportand the draw bar for supplying elastic force for the draw bar, wherein the draw bar is pivotally connected to the support; a draw bar force transformation structure corresponding to the elastic resetelement is arranged on the draw bar; an elastic force transformation structure corresponding to the draw bar force transformation structure is arranged on the elastic reset element; and the draw barforce transformation structure and the elastic force transformation structure can respectively form a first bearing structure and a second bearing structure through touch coordination at the droppingout moment and the resetting moment of the draw bar, and a reset force arm from the elastic reset element to the pivoted rotation center of the draw bar when the second bearing structure is formed isgreater than a drop-out force arm from the elastic reset element to the pivoted rotation center of the draw bar when the first bearing structure is formed.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a tripping reset structure of a draw bar of a circuit breaker. Background technique [0002] The tripping structure is the core structure for the mechanical circuit breaker to perform the tripping action to break the fault current. It is mainly composed of a jumper, a lock and a drawbar installed on the bracket. Among them, the power required for reset after the drawbar trips is usually provided by the torsion spring. If the torsion spring force is too small, the movement of the drawbar will be difficult and the reset will be unreliable; if the torsion spring force is too large, the tripping force required to push the drawbar to perform the tripping action will increase, resulting in a decrease in breaking performance. [0003] With the traditional torsion spring matching structure, the tripping and resetting of the drawbar is a process of monotonous change of f...

AI Technical Summary

Problems solved by technology

This causes either the reset force is small and the reset is unreliable, or the tripping force is large and it is difficult to trip

Can't have both

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