Large-current miniature circuit breaker

Abstract

The invention relates to a large-current miniature circuit breaker, which comprises a shell. An operating mechanism, a plastic lock catch support, a tripping mechanism, a moving contact, a fixed contact, an arc extinguishing chamber and a bimetal sheet are arranged in the shell. Wiring terminals are respectively arranged on the two sides of the internal part of the shell. The plastic lock catch support is hinged in the shell. The plastic lock catch support comprises a lock catch part which is matched with the operating mechanism and an instantaneous tripping part which is matched with the tripping mechanism. The tripping mechanism comprises an electromagnetic induction element and an armature. The electromagnetic induction element is matched with the bimetal sheet. The armature is fixedly arranged at the instantaneous tripping part of the plastic lock catch support and is matched with the electromagnetic induction element. By adopting the technical scheme, the large-current miniature circuit breaker has the effects that the structure is simple, the cost is lower, and the breaking capacity and the rated current are greatly improved.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a high-current miniature circuit breaker. Background technique [0002] A miniature circuit breaker usually includes a shell, which is equipped with an operating mechanism, a plastic lock frame, a tripping mechanism, a moving contact, a static contact, an arc extinguishing chamber and a bimetallic sheet, and the two sides of the shell are respectively equipped with Binding post, one end of the bimetal sheet is conductively connected with the terminal post on one side of the housing, the other end of the bimetal sheet is conductively connected with the moving contact through a brush wire, the plastic locking frame is hingedly arranged in the casing, and the plastic locking frame It includes a locking part that cooperates with the operating mechanism and an instantaneous release part that cooperates with the tripping mechanism. The tripping mechanism of the traditional miniature ci...

AI Technical Summary

Problems solved by technology

In the traditional miniature circuit breaker, the tripping mechanism adopts an electromagnetic tripper, and the electromagnetic tripper is usually set above the arc extinguishing chamber. Since the electromagnetic tripper has a large volume, and the miniature circuit breaker is limited by the overall volume, Therefore, the volume of the arc extinguishing chamber can only be reduced, thus limiting its breaking capacity and rated current. The traditional miniature circuit breaker with a shell width of 18mm has a rated current of only 63A

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