Static contact structure of low-voltage circuit breaker

Abstract

The invention discloses a static contact structure of a low-voltage circuit breaker, which comprises a support, a static contact and a connecting bar; the support comprises a cavity structure and a clamping structure; the cavity structure is provided with a first recess passing through the support; both side walls of the first recess are provided with two rows of bosses at intervals with a long slot arranged between; the clamping structure is provided with a first side wall and a second side wall arranged symmetrically on both sides; a positioning shaft is fixed on the support; a bearing slide plate is arranged in the long slot formed by the two rows of bosses in a sliding way; one end of the bearing slide plate is provided with a limit recess, and the other end thereof is provided with ayielding recess; the inner side surfaces on both ends of the yielding recess are correspondingly provided with the bosses, and the free end of the static contact extends into the limit recess; and one end of a fixed pressure spring is fixed on each boss, and the other end thereof is fixed on the side surface of the cavity structure opposite to the boss. The static contact structure of the low-voltage circuit breaker provides the reset force of the static contact with the pressure spring and the slide plate structure, thereby ensuring the stability of the static contact structure and prolonging the service life thereof.

Description

technical field [0001] The invention relates to a static contact part of a low-voltage circuit breaker, belonging to the technical field of low-voltage electrical appliances. Background technique [0002] The electrical connection of the conductive system of the low-voltage circuit breaker includes: the connection between the incoming line bar and the static contact, the connection between the moving contact and the heating element, and the connection between the heating element and the outgoing line bar. Among them, the moving contact and the static contact are the most critical parts of the electrical connection in the molded case circuit breaker. When the low-voltage circuit breaker breaks the current, an arc will be generated between the contacts, which will cause wear to the moving and static contacts of the circuit breaker, and accelerate the migration of the contact material, which will affect the life of the contacts; if it can be repelled The structure of the stati...

AI Technical Summary

Problems solved by technology

The disadvantage of this static contact structure is: the installation and fixing of the tension spring is difficult, the tension spring is easy to deform, and after a long time of use, the tension spring will not be able to provide the reset force required by the mechanism, shortening the service life of the static contact

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