Thermal-magnetic release for circuit breakers

Abstract

A thermo magnetic release for a circuit breaker comprises a contact plate, a magnetic yoke bracket, and a bimetallic strip and a coil connected with the magnetic yoke bracket, wherein the contact plate is electrically connected with the bimetallic strip and the coil respectively, one part of current flowing through the contact plate flows to the bimetallic strip, and the other part flows to the coil; and the bimetallic strip and the coil are indirectly electrically connected through the magnetic yoke bracket, and thus, current flowing through the bimetallic strip enters the coil through the magnetic yoke bracket. According to the thermo magnetic release for the circuit breaker provided by the invention, through effectively dividing current flowing through the contact plate, overload protection can be realized, temperature rise of a product can also be reduced, the structure is simple and reliable, and the release action reliability and the stability of the circuit breaker can be improved.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a thermal-magnetic tripper of a circuit breaker. Background technique [0002] The main function of the miniature circuit breaker is to realize the long-time overload protection and the instantaneous protection of the circuit breaker through the thermal magnetic release. It works through the direct current-carrying heating of the double gold; the side-heating type works by transferring the current-carrying heat of the thermal element to the double gold to cause heating and bending. The thermal tripping system of the existing miniature circuit breaker is mainly a direct heating structure, and the current passes directly through the bimetal, but when the current flowing through it is large, the delay characteristic is prone to be unstable, and the main reason for this is the temperature rise High, which affects the stability and reliability of overload protection; ...

AI Technical Summary

Problems solved by technology

The thermal tripping system of the existing miniature circuit breaker is mainly a direct heating structure, the current passes directly through the bimetal, but when the current flowing through it is large, the delay characteristic is prone to be unstable, and the main reason for this is the temperature rise High, which affects the stability and reliability of overload protection; and in the existing miniature circuit breakers, the thermal magnetic release is difficult to quickly install in place, the installation requires multiple debugging, time-consuming and laborious, low assembly efficiency, and unstable installation advanced questions

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