Trip structure of circuit breaker

Abstract

A trip structure of a circuit breaker comprises an operating mechanism and an electromagnetic tripper, wherein the operating mechanism is in linkage with an operating handle of the circuit breaker to drive a movable contact assembly to swing and match with a static contact, the operating mechanism comprises a jump pin and a lock which are buckled and connected, an extension end is arranged on the lock and is matched with a top rod of the electromagnetic tripper, and a trigger bulge is also arranged between the lock and the movable contact assembly; and when the circuit breaker is circuit-shorted, the top rod of the electromagnetic tripper collides with the extension end of the lock, the movable contact assembly swings to push the lock via the trigger bulge by means of an electric repulsive force between a movable contact of the movable contact assembly and the static contact, and the lock and the jump pin are pushed to be unlocked jointly by the top rod of the electromagnetic tripper and the movable contact assembly. In the trip structure of the circuit breaker, provided by the invention, the circuit breaker is rapidly tripped by additionally arranging the trigger bulge between the lock and the movable contact assembly, the trip structure is simple and reliable, a fusion welding phenomenon occurred between the movable contact and the static contact caused by long trip time can be effectively prevented, and the disconnection capability of the circuit breaker is improved.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a tripping structure of a circuit breaker. Background technique [0002] When the existing low-voltage circuit breaker is short-circuited, the tripping of the circuit breaker is realized mainly by the coil push rod pushing the lock. The specific performance is that a large current generates a magnetic field to move the moving iron core and the coil spring, and the spring transfers energy to the push rod to push the lock. Make the operating mechanism unlock the circuit breaker off. Although in the tripping structure of the current circuit breaker, the contact support and the lock have relative movement when the short circuit trips, but the contact support cannot push the lock to unlock the acceleration mechanism. Therefore, during the breaking test of the tripping structure, fusion welding between the dynamic and static contacts is prone to occur, which is not con...

AI Technical Summary

Problems solved by technology

Although in the current tripping structure of the circuit breaker, the contact support and the lock have relative movement when the short circuit trips, but the contact support cannot push the lock to accelerate the mechanism to unlock

Therefore, the tripping structure is prone to welding between the dynamic and static contacts during the breaking test, which is not conducive to the performance improvement of the circuit breaker

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