Contact system used for double-breakpoint plastic casing breaker

Abstract

The invention relates to a contact system used for a double-breakpoint plastic casing breaker. The contact system comprises a moving contact, a first static contact, a second static contact, a rotation shaft, two fixed shaft pins, two sliding shaft pins and two springs. The rotation shaft is provided with a radially through model trough hole and two concave arc-shaped steps are symmetrically arranged in the model trough hole. The moving contact penetrates through the model trough hole to be arranged, two concave arc-shaped sliding faces are symmetrically arranged at both sides of the moving contact, and the two concave arc-shaped sliding faces are corresponding to the two concave arc-shaped steps in the model trough hole. With the adoption of the contact system of the invention, the moving contact does not have falling phenomenon during short circuit breaking, and energy generated by fast opened moving contact can not have impact on an outer casing of the breaker.

Description

technical field [0001] The invention relates to an electrical component, in particular to a contact system for a double break point molded case circuit breaker. Background technique [0002] At present, due to structural reasons, most low-voltage plastic case circuit breakers (double breakpoints) tend to fall back when the moving contacts are disassembled under the action of electric repulsion when the short circuit is broken, causing the arc to reignite, and even worse. Otherwise, the moving and static contacts are reclosed and welded, which is very harmful. At the same time, due to the action of electric repulsion, the moving contact opens rapidly, and the energy is relatively large, which will have a severe impact on the casing of the circuit breaker, causing damage to the casing. Contents of the invention [0003] The object of the present invention is to solve the above problems and provide a contact system with a new structure for a double break point molded case ci...

AI Technical Summary

Problems solved by technology

[0002] At present, due to structural reasons, most low-voltage plastic case circuit breakers (double breakpoints) tend to fall back when the moving contacts are disassembled under the action of electric repulsion when the short circuit is broken, causing the arc to reignite, and even worse. Those who make the dynamic and static contacts close again and welded are very harmful.

At the same time, due to the action of electric repulsion, the moving contact opens rapidly, and the energy is large, which will have a severe impact on the casing of the circuit breaker, causing damage to the casing

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