Miniature Circuit Breaker

Abstract

The invention relates to a miniature circuit breaker to solve the problem that the existing miniature circuit breaker is not protected at a contact part between a moving contact and a fixed contact of an L pole, so that electric arc cannot be effectively led to an arc extinguishing chamber. The miniature circuit breaker comprises a housing, an arc extinguishing system, the fixed contact of the L pole and a bracket of the fixed contact of the L pole, wherein the housing comprises an upper cover, a middle cover and a bottom cover, an internal cavity of the housing is divided by the middle housing into a chamber of an N pole and a chamber of the L pole, the arc extinguishing system comprises the arc extinguishing chamber and a run-on plate of the L pole, two flash barriers are arranged inside the chamber of the L pole and separated by the bracket of the fixed contact of the L pole and the run-on plate of the L pole so as to form a notch, and the fixed contact of the L pole is arranged inside the notch. The miniature circuit breaker has the following beneficial effects that the upper and lower flash barriers are added on the two sides of the fixed contact of the L pole, so that the electric arc generated when the moving and fixed contacts of the L pole are separated can be quickly led to the arc extinguishing chamber by an air flow due to the direction of a magnetic field.

Description

technical field [0001] The invention relates to a miniature circuit breaker. Background technique [0002] Each unit of the miniature circuit breaker includes a casing and an operating handle, and the casing is equipped with an operating mechanism, a release, a contact system, an arc extinguishing system, an overcurrent protection system and a short circuit protection system. Through the operating handle, the operating mechanism drives the moving contact in the contact system to make the small circuit breaker turn on and off, and realize the control of the electrical circuit; through the sensing of the current thermal effect and magnetic effect, the electrical circuit is overloaded, Protection is implemented in the event of a fault such as a short circuit. [0003] When the moving and static contacts are in contact and there is enough contact pressure, the miniature circuit breaker is connected to the electrical circuit, and the local temperature change of the miniature cir...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing miniature circuit breaker in the background technology usually has no protection at the contact point of the L pole dynamic and static contacts, so that the arc cannot be effectively led to the arc extinguishing chamber, the present invention provides a miniature circuit breaker

Images