Improved structure of miniature circuit breaker operating mechanism

Abstract

The invention relates to an improved structure of a miniature circuit breaker operating mechanism. The characteristics lie in that the improved structure comprises an upper four-bar linkage (1) and alower four-bar linkage (2), wherein the upper four-bar linkage (1) and the lower four-bar linkage (2) are connected in series. The improved structure shortens the unlocking time of the mechanism whena circuit breaker breaks high current. Meanwhile, the improved structure eliminates drop of a moving contact reliably and effectively, is increased in spacing, shortened in arc striking path, enhancedin arc extinguishing capacity, accelerated in tripping speed and shortened in breaking time, and improves the breaking capacity of the circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to an improved structure of an operating mechanism of a circuit breaker, which can improve the breaking capacity of the circuit breaker. Background technique [0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Low-voltage circuit breaker, also known as automatic switch, commonly known as "air switch", also refers to low-voltage circuit breaker. It is an electrical appliance that not only has the function of manual switch, but also can automatically protect against voltage loss, undervoltage, overload, and short circuit. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and can automatically cut off the circuit when they have severe overload, short circuit and undervoltage faults. Its function is equivale...

AI Technical Summary

Problems solved by technology

[0003] The operating mechanism of the circuit breaker is the main part that controls the opening and closing action of the circuit breaker. However, the operating mechanism of the existing miniature circuit breaker is a four-bar linkage mechanism. A certain distance makes the running arc in front of the arc extinguishing chamber longer, which limits the breaking capacity of the circuit breaker with higher capacity under the limited installation space; secondly, when the short-circuit current occurs in the existing miniature circuit breaker, the moving contact is repelled, In the process of the action of the electromagnet of the trip unit to push the jumper to unlock, there is a time lag between the two, making the tripping time relatively long, and when performing breaking, the movement of the moving contact is controlled by the frame, making the breaking speed relatively slow ; Third, when there is a fluctuating short-circuit current in the existing miniature circuit breaker, the moving contact will first be repelled and then fall back, which will cause repeated arcing to damage the contact, and ultimately affect the service life of the circuit breaker

Images