A multi-loop circuit breaker

Abstract

A multi-loop circuit breaker comprises an incoming terminal, an outgoing terminal, an electromagnetic mechanism, a static contact, a movable contact and a thermal stripping mechanism. The electromagnetic mechanism is provided with a coil and a movable iron core, one end of the coil is electrically connected with an incoming terminal, and the movable iron core is located in the coil and movable along the axis thereof; The static contact is electrically connected with the coil, and the movable contact is electrically connected with the thermal stripping mechanism. the multi-loop circuit breakerfurther comprises a linkage rod and at least a first auxiliary current circuit, the first auxiliary current circuit being coupled in parallel with the electromagnetic mechanism; The linkage rod is rotatably arranged, one end of the linkage rod is linked with one end of the movable iron core, and the other end of the linkage rod is in contact with the first auxiliary current circuit. When the shortcircuit occurs, the movable iron core moves to drive the linkage rod to rotate so that the first auxiliary current circuit is first disconnected, and then the static contact is separated from the movable contact. The invention can improve the rated current of the circuit breaker and the short-circuit breaking ability of the circuit breaker.

Description

technical field [0001] The invention relates to the field of circuit breakers, in particular to a multi-circuit circuit breaker. Background technique [0002] The electromagnetic trip mechanism is an important functional part of a miniature circuit breaker, which is mainly composed of a coil, a moving iron core and a static iron core. The moving iron core and the static iron core are located in the inner cavity of the coil. Under normal working current, there is a certain gap between the moving iron core and the static iron core. When the moving iron core moves in the same direction, the tripping mechanism of the contact mechanism of the circuit breaker is pushed by the push rod to open the contact. [0003] Generally, the more turns of the coil of the electromagnetic mechanism, the stronger the magnetic field it generates under the short-circuit current, the faster the opening speed of the moving iron core-driven contact mechanism, and the stronger the short-circuit breaki...

AI Technical Summary

Problems solved by technology

However, the number of coil turns of the electromagnetic mechanism is reduced, the excitation capacity is weakened, and the short-circuit breaking capacity of the circuit breaker is reduced.

Most of the 18mm wide miniature circuit breakers on the market can only achieve a rated current of 100A and a breaking capacity of 6kA.

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