Electric magnet backup protection apparatus

Abstract

The embodiment of the invention discloses a backup protection device of an electromagnet . A first yoke iron is fixed on the upper part of a first bracket; a second bracket and an armature are rotatably fixed on the middle part of the first bracket; the second bracket is fixed to the first bracket through a first rotating shaft; the armature is fixed to the second bracket; a spring connects the first bracket and the second bracket; and the spring force of the spring enables the armature and the yoke iron to be separated from each other. When short circuit fault occurs, a current travels through the backup protection device of the electromagnet, and the electromagnetic force between the yoke iron and the armature enables the both to be absorbed by each other. The backup protection device has a small volume, and can be completely used in a small capacity plastic shell circuit breaker. The device can directly acts on the back surface of a pull rod of the circuit breaker, thereby greatly reducing the time required by short circuit movement, and improving the capacity of short circuit protection. In addition, the device can enable the circuit protection function of the circuit breaker to be more complete, particularly to a small capacity electronic circuit breaker.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to an electromagnet backup protection device for a low-voltage circuit breaker. Background technique [0002] Low-voltage circuit breakers are important electrical components in the field of low-voltage electrical appliances. They usually have functions such as short-circuit protection and overload protection. Small-capacity molded case circuit breakers at home and abroad often do not have an electromagnet backup protection device due to their small size, especially for thermal-magnetic small-capacity circuit breakers, because the tripping of the circuit breaker is usually triggered by a secondary mechanism, and there are often many triggering links. The triggering time is usually relatively long; and for small-capacity circuit breakers using electronic trippers, the instantaneous action has to go through a series of circuit signal processing, and then send a signal ...

AI Technical Summary

Problems solved by technology

Small-capacity molded case circuit breakers at home and abroad often do not have an electromagnet backup protection device due to their small size, especially for thermal-magnetic small-capacity circuit breakers, because the tripping of the circuit breaker is usually triggered by a secondary mechanism, and there are often many triggering links. The triggering time is usually relatively long; and for small-capacity circuit breakers using electronic trippers, the instantaneous action has to go through a series of circuit signal processing, and then send a signal to the electronic tripping relay to trigger the circuit breaker Tripping, so the time required for tripping is relatively long, which limits the improvement of the ability of short-circuit protection to a certain extent

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