Miniature arc extinguishing structure of circuit breaker

Abstract

The invention relates to the technical field of a circuit breaker, and discloses a miniature arc extinguishing structure of the circuit breaker. The arc extinguishing structure comprises an arc extinguishing passage (11), wherein the arc extinguishing passage (11) is used for connecting an exhaust end (1) and an arc striking end (2) below a movable contact and a static contact, two magnetic conduction plates (5) and an arc extinguishing cover (6) are arranged on the side wall of the arc extinguishing passage (110), the two magnetic conduction plates (5) are oppositely arranged, the arc extinguishing cover (6) is arranged between the two magnetic conduction plates (5), arc isolation walls (7) are arranged between the magnetic conduction plates (5) and the arc extinguishing cover (6), and an arc runner is formed between the arc extinguishing cover (6) and the arc isolation walls (7) and extends to the exhaust end (1). With the arc extinguishing structure disclosed by the invention, an arc can be effectively and rapidly introduced to an arc extinguishing system when large current happens, a grid sheet combination cannot be burned and scatted, and several grid sheets are melted together to loss an arc extinguishing function.

Description

technical field [0001] The present invention relates to the technical field of circuit breakers, in particular to an arc extinguishing structure of a small circuit breaker. Background technique [0002] The circuit breaker is a very common switching device in the circuit. It is widely used in all levels of outgoing lines and terminal systems of power distribution systems in industrial fields, construction fields, water conservancy and hydropower and other fields. A circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a trip unit, and a casing. The function of the circuit breaker is to cut off and connect the load circuit, and cut off the faulty circuit, so as to prevent the expansion of the accident and ensure safe operation. When the moving and static contacts of the circuit breaker are under load or broken by a large current due to a fault, the voltage between the moving and static contacts will cause the air medi...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the existing products cannot quickly and effectively introduce the arc into the arc extinguishing system when encountering a large current. To solve the problem, provide a small circuit breaker extinguishing system that can quickly and effectively introduce the arc into the arc extinguishing system when a large current is encountered. arc structure

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