Arc extinguishing system of miniature circuit breaker

Abstract

The invention relates to an arc extinguishing system of a miniature circuit breaker. The arc extinguishing system comprises a shell and an arc extinguishing piece, wherein the arc extinguishing piececomprises a connection part, a shift part and an arc extinguishing grid part, the connection part is rotatably connected with the shell and is provided with an initial position and an arc extinguishing position, the shift part is connected with the connection part, the arc extinguishing grid part is connected to the connection part, insulation material arc isolation plates are further arranged attwo side legs of an arc extinguishing grid and are provided with air holes, an arc isolation piece is formed by processing a high polymer insulation material capable of generating gas, the generated arc is isolated by an isolation plate, leg parts of the grid cannot be burnt, and the service lifetime of the arc extinguishing grid, a movable contact and a static contact is prolonged. On the other hand, the generated high-temperature gas can enter a gap between the legs of each grid through air outlet holes, air pressure of an arc extinguishing chamber is favorably reduced, metal vapor is enabled to be reduced, and the air pressure is also prevented from being excessively raised; and by a simple arc extinguishing structure, the breaking capability of the miniature circuit breaker is remarkably improved, and the service lifetime of the miniature circuit breaker is prolonged.

Description

technical field [0001] The invention relates to a miniature circuit breaker, in particular to an arc extinguishing system in the miniature circuit breaker. Background technique [0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The division of high and low voltage boundaries is relatively vague. Generally, those above 3kV are called high-voltage electrical appliances. Low-voltage circuit breaker, also known as automatic switch, commonly known as [0003] "Air switch" also refers to a low-voltage circuit breaker, which is an electrical appliance that not only has the function of a manual switch, but also can automatically protect against voltage loss, undervoltage, overload, and short circuit. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and can automatically cut off the circuit when they have severe overload, ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a miniature circuit breaker arc extinguishing system, which solves the problems of the existing miniature circuit breaker, such as the high temperature gas generated by arc extinguishing, which causes the casing to rupture, the arc extinguishing effect is not good, and the structure is complicated

Images