Tripping mechanism and circuit breaker

Abstract

The invention discloses a tripping mechanism and a circuit breaker, and relates to the technical field of circuit breakers. The tripping mechanism comprises a first lock catch, a second lock catch and a tripping piece. The tripping piece is arranged between the first lock catch and the second lock catch, the first lock catch, the tripping piece and the second lock catch can rotate along a preset axis, the tripping piece abuts against the first lock catch and the second lock catch, the tripping piece is used for abutting against the first tripper, and the tripping piece can be driven by the first tripper to rotate, so the first lock catch and the second lock catch are simultaneously driven to rotate and release. Compared with the prior art, the tripping mechanism provided by the invention adopts the tripping piece which is arranged between the first lock catch and the second lock catch and is respectively propped against the first lock catch and the second lock catch, so that the tripping action of the side-by-side lock catches can be synchronously realized, and the tripping sequence of the lock catches is irrelevant to whether the current is balanced or not; and the condition that one moving contact is always burnt by an electric arc is prevented.

Description

technical field [0001] The present invention relates to the technical field of circuit breakers, in particular to a tripping mechanism and a circuit breaker. Background technique [0002] At present, in the application of circuit breakers, a tripper is generally matched with a tripping mechanism to drive the tripping mechanism to trip in the event of a serious overload, short circuit or undervoltage fault, thereby cutting off the circuit and avoiding dangerous situations. occur. When multiple tripping mechanisms are arranged side by side, the currents of the circuits where each tripping mechanism is located are unbalanced. The circuit with a small resistance has a large current, and its tripping mechanism operates early; the circuit with a large resistance has a small current, and its tripping mechanism operates late. The moving contact in the late tripping mechanism is separated from the static contact, and the arc generated during the separation will burn the moving conta...

AI Technical Summary

Problems solved by technology

The moving contact in the late tripping mechanism is separated from the static contact, and the arc generated during the separation will burn the moving contact, resulting in greater contact resistance after the next closing, and the tripping mechanism moves later. In this way, a vicious circle is formed, and the arc always burns out and trips the moving contact, which shortens the service life of the circuit breaker

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