Circuit breaker

Abstract

The invention relates to a circuit breaker, which is characterized in that corresponding upper and lower rows of contact groups are respectively arranged on a moving contact and a static contact, thecontact group close to an arc extinguishing chamber is used as an arcing contact, the other contact group is used as a current-carrying contact, and the contact groups are separated by gas generationinsulating pieces to protect the current-carrying contact from being ablated by an electric arc; the gas generation insulating piece is installed on the contact, and a large amount of gas can be generated to push the arc to move towards the arc extinguishing chamber when the arc is generated, so that arc extinguishing efficiency is improved, and breaking capacity is improved; and an insulating flash barrier for dividing the arc is arranged in the arc extinguishing chamber to assist in arc extinguishing and cooling of the arc, and the arc can jump from the moving contact to an arc striking sheet quickly to run out of the arc by arranging the moving contact and the arc striking sheet close to each other. According to the invention, contacts are saved on the whole, and the arc extinguishing efficiency is improved.

Description

technical field [0001] The present invention relates to a circuit breaker, in particular to the improvement of the contact system therein. Background technique [0002] The frame circuit breaker is a commonly used circuit breaker. The common frame circuit breakers on the market are as follows: figure 1 As shown, it includes a static contact 100 and a moving contact 200 roughly arranged left and right, and an arc extinguishing chamber 300 arranged above the moving contact 200. The moving contact 200 is composed of a group of contact plates of the same specification connected in parallel, and the static contact The contact part of 100 is an integral planar structure. The arc extinguishing chamber 300 includes an arc extinguishing grid, and the two ends of the arc extinguishing grid have arc starting plates 301 and 302. In this conventional structure, the dynamic and static contact systems and the extinguishing The structure of the arc chamber is relatively simple, and usually...

AI Technical Summary

Problems solved by technology

[0003] 1. The structure of the arc extinguishing chamber is simple, and the number of arc extinguishing grids is limited. When the circuit breaker works under high voltage and high current, the arc energy is large, and the arc extinguishing capacity of the arc extinguishing chamber is insufficient;

[0004] 2. The moving speed of the arc from the contact to the arc extinguishing chamber and the arc extinguishing chamber is slow, resulting in low arc extinguishing efficiency of the arc and difficult to be extinguished;

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