Low-voltage plastic shell breaker element box device

Abstract

The invention relates to a low-voltage plastic shell breaker element box device. A moving contact system, a fixed contact system and an arc extinction system in each phase are fixedly installed in a centralized mode through two box bodies which are combined left and right. The two element box bodies are fastened by screws to form a sealed and independent space. Three phases of a breaker are all independently installed, and each phase is an independent element subassembly. Uimp among the phases can be increased to 8kV, so that the protection level of products is improved, the full modular design of a breaker product body part is achieved, production and assembly can be conducted in advance in the production process, the storage amount of parts is reduced, the breaker is easy and convenient to assemble, a breaker body can be produced only by combining the three phases, production cycle is greatly shortened, and productivity is improved.

Description

technical field [0001] The invention relates to a low-voltage switchgear in power transmission and transformation equipment in public places, which is applied to a buckle mechanism of a low-voltage molded case circuit breaker. Background technique [0002] In the prior art, the moving contact, static contact, arc extinguishing cover and other parts of the main body of the low-voltage molded case circuit breaker are respectively installed in the base pressed by plastic molding, and each part is dispersedly assembled in a molded case circuit breaker. In the cavity, when a short-circuit current occurs in the line, the electric repulsion overcomes the shackles of the contact pressure, lifts the movable contact, and an arc is generated between the silver points of the movable and static contacts. With the increase of the distance between the movable and static contacts, the arc is continuously After being elongated and magnetized by the arc extinguishing grid, the arc is attracte...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the moving contact, static contact, arc extinguishing cover and other parts of the main body of the low-voltage molded case circuit breaker are respectively installed in the base pressed by plastic molding, and each component is dispersedly assembled in a molded case circuit breaker. In the cavity, when a short-circuit current occurs in the line, the electrodynamic repulsion overcomes the shackles of the contact pressure, lifts the movable contact, and an arc is generated between the silver points of the movable and static contacts. With the increase of the distance between the movable and static contacts, the arc is continuously After being elongated and magnetized by the arc extinguishing grid, the arc is attracted to enter between the grids, the arc is divided into small arcs, the arc voltage is increased, and the rise of the short-circuit current is suppressed, so as to achieve the purpose of arc extinguishing. This traditional The structure is widely used in domestic molded case circuit breakers, which limits the overall technical level. Due to the open arc extinguishing structure, the breaking capacity of domestic circuit breakers is not high overall, and the bulk structure inside the circuit breaker is also Make the overall volume of the circuit breaker relatively large

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