Improved circuit breaker

Abstract

The invention relates to an improved circuit breaker. The improved circuit breaker comprises a shell, a circuit protection actuating mechanism, a moving contact, a fixed contact and a fastener mechanism, wherein the circuit protection actuating mechanism is positioned in the shell; the moving contact is matched with the fixed contact; the fastener mechanism comprises a fastener and a driving part which drives the fastener to rotate; a fixed mount is hinged on the fastener, and can drive the fastener to get away from the driving part; a fastener cover is also hinged on the fastener; and the circuit protection actuating mechanism is matched with the fastener cover to drive the fastener to get away from the driving part. The improved circuit breaker has the advantages that: two independent driving elements of the fixed mount and the fastener cover are used for tripping the fastener mechanism, and both the fixed mount and the fastener cover can drive the fastener mechanism to get away, so that the risk of secondary electric arc, which is caused by a reason that the moving contact is separated from the fixed contact at first due to an electrical repulsion force to cause a tripping mechanism not to act, then the moving contact is attached to the fixed contact again to cause the tripping mechanism to act, and the moving contact is separated from the fixed contact again, is avoided.

Description

technical field [0001] The invention relates to a circuit breaker which provides overload and short-circuit protection for electrical circuits and electrical equipment, in particular to an improved circuit breaker. Background technique [0002] At present, there are various types of circuit breakers with different working principles. One type of circuit breaker uses circuit protection mechanisms such as short-circuit current relays and bimetallic strips and tripping mechanisms that cooperate with these protection mechanisms, and sets the moving contacts on the tripping mechanism to monitor the circuit through the circuit protection mechanism. In case of overload, short circuit, etc., the corresponding action is used to drive the tripping mechanism to separate the moving contact from the static contact to realize the disconnection protection of the circuit. [0003] In this type of circuit breaker, the key points of the scheme mainly focus on the linkage and cooperation rela...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this scheme is that the disconnection speed of the contacts is relatively slow, the static contacts and the moving contacts are separated, and the mechanism does not move, which is easy to form a secondary arc.

The overload time-delay release and the overload time-delay release drive the tripping mechanism first and then drive the contacts to separate, because the energy storage mechanism not only drives the contact device to move, but also drives the tripping mechanism, the energy storage cannot be fully The kinetic energy of the contact is converted, and the disconnection speed of the contact is slower, and the tripping mechanism cannot be driven after the moving contact and the static contact are separated, and the moving contact is easy to rebound and connect with the static contact again to form a secondary arc

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