Contact system of low-voltage circuit breaker

Abstract

The invention relates to a contact system of a low-voltage circuit breaker. In the contact system, a first sliding shaft is a hollow tube, the connecting ends matched with the first sliding shaft, of a first spring and a second spring separately form a rotating supporting shaft; the both ends of the first sliding shaft are sleeved on the rotating supporting shafts respectively to constitute hinged connections; and the first sliding shaft fits with the first cam-shaped surface of the main body in a rolling friction manner. As the sliding shaft is hinged with the first spring and the second spring, the sliding shaft can rotate along the rotating supporting shaft; when the moving contact moves, the sliding shaft does not perform rigid friction, but rolling friction with the moving contact and the contact force is small, thus the rolling time is greatly shortened, namely the rejection time of the moving contact is shortened; and as the wear problem does not exist, the service life of the sliding shaft can be prolonged and the service life of the entire contact system is increased.

Description

technical field [0001] The invention relates to a contact system of a circuit breaker. Background technique [0002] When the existing circuit breaker works normally, the contact surface on the moving contact is connected to the static contact; when the circuit is short-circuited, due to the opposite direction of the current, a repulsive force is generated on the contact surface to separate the moving contact from the static contact , At the same time, the repulsive force is relatively large, the moving contact does not stay at the separated position, but may jump to the static contact again, and re-ignition occurs, causing the electrical appliance to burn out. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of the prior art and provide a contact system of a circuit breaker with higher reliability and more compact structure. When the moving contact is separated from the static contact, it can prevent the moving contact fro...

AI Technical Summary

Problems solved by technology

[0002] When the existing circuit breaker works normally, the contact surface on the moving contact is connected to the static contact; when the circuit is short-circuited, due to the opposite direction of the current, a repulsive force is generated on the contact surface to separate the moving contact from the static contact , at the same time, the repulsive force is relatively large, the moving contact does not stay at the separated position, but may jump to the static contact again, and re-ignition occurs, causing the electrical appliance to burn out

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