Miniature DC Circuit Breaker

Abstract

An improved miniature DC circuit breaker, which solves the problems in the prior art that the magnetic energy of the permanent magnet decreases under the high temperature of the arc and affects the reliability of the work. device, handle, locking mechanism, soft connection, moving contact, static contact, outlet terminal and arc extinguishing chamber. The technical points are: a vertically placed The magnetic blowing arc extinguishing device composed of a permanent magnet and two magnetic guide sheets, the N pole of the permanent magnet covered by a heat-insulating sleeve is facing upwards, and the S pole is facing down, which is seamlessly adsorbed on the conductors of the N and S extremes of the permanent magnet. The magnetic sheet and the arc shield made of heat-resistant materials are respectively packaged on the inner side of the insulating base and the insulating cover, and the arc starting angle is connected with the static contact and extended to the bottom of the arc extinguishing chamber. Its compact structure and reasonable design can not only improve the working voltage and arc breaking ability, but also significantly reduce the electrical wear of the contacts and prolong the service life of the contacts.

Description

Technical field [0001] The invention relates to a low-voltage electrical switch used in a DC power grid, in particular to an improved miniature DC circuit breaker. It is mainly used in power switching and circuit control places where the rated working voltage can reach kilovolts. Background technique [0002] At present, the miniature DC circuit breaker is a very extensive electrical switch used in the DC grid. When an overload or short-circuit fault occurs in the circuit, it can play a role in disconnecting the protected circuit. Generally, the single-pole (1P) interrupter has one contact room, while the two-pole (2P) has two contact rooms, and the four-pole (4P) has four contact rooms, which are combined into the same contact room. Arc extinguishing chambers are collectively referred to as multi-pole arc extinguishing chambers. With the continuous innovation and development of electrical switch technology, various miniature DC circuit breakers have appeared one after another....

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an improved miniature DC circuit breaker, which solves the problems in the prior art that the magnetic energy of the permanent magnet decreases under the high temperature of the arc and affects the reliability of the work. Compared with similar products, it has a compact structure and a design Reasonable, can not only improve the working voltage and arc breaking ability, but also significantly reduce the electrical wear of the contacts and prolong the service life of the contacts

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