Breaker

Abstract

The present invention provides a breaker. The breaker comprises a pair of mutually cooperated moving contact and static contact, an arc extinguish chamber and an arc ignition runway facing the end protruding of the static contact and being divided into a first segment and a second segment through a protruding portion, wherein the free end of the first segment is close to the tail end of the moving contact, the free end of the second segment extends into the arc extinguish chamber, and the distance of the tail end of the static contact is smaller than the distance from any one point on the arc ignition runway to the tail end of the static contact. The breaker can allow the arc to rapidly depart from a contact area after formation and jump to the arc ignition runway so as to reduce the ablation of the arc to the contact; and moreover, the arc can be rapidly pushed to the arc extinguish chamber to effectively avoid the countermovement of the arc and the reigniting of the contact area.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a residual current operated circuit breaker or a miniature circuit breaker. Background technique [0002] As we all know, a circuit breaker is a switching device that can close, carry and break current under normal or abnormal circuit conditions. And be widely used in life. [0003] More typically, for example, for residual current operated circuit breaker (RCBO) or miniature circuit breaker (MCB) products with overcurrent protection function, when breaking short-circuit current, when the contacts are opened to form an arc, can the arc be quickly It is very important for the product to extinguish the arc safely and reliably. If the arc cannot quickly jump to the arc runway and continues to burn in the contact area, it will have a serious impact on the dynamic and static contacts, or even burn the contacts, resulting in the complete loss of product functions. At the same time, the distance ...

AI Technical Summary

Problems solved by technology

If the arc cannot quickly jump to the arc runway and continues to burn in the contact area, it will have a serious impact on the dynamic and static contacts, or even burn the contacts, resulting in a complete loss of product function

At the same time, the distance between the root position of the moving contact and the arc runway after it is opened affects the speed of the arc jump

A smaller distance can ensure a faster jump, but it may cause the arc to re-ignite behind the contact area, and arc back phenomenon will occur, which will affect the breaking performance of the product

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