Miniature circuit breaker

Abstract

The invention relates to a miniature circuit breaker, which is characterized in that an operating mechanism and a static contact are arranged in a shell of the miniature circuit breaker, the operatingmechanism comprises a contact support, the contact support is provided with a moving contact matched with the static contact, and a shielding piece used for shielding electric arcs between the movingcontact and the static contact is arranged in the shell; the shielding piece is provided with a rotating end, a limiting end and a shielding end; the rotating end is rotatably connected with the shell, the limiting end is provided with a sliding groove used for controlling the relative positions of the shielding piece and the moving contact, and the moving contact extends into the sliding groovethrough the protruding contact part to drive the shielding piece to rotate around the rotating end relative to the moving contact; and during opening, the shielding end is rotated into the position between the moving contact and the static contact, and during closing, the shielding end is rotated out of the position between the moving contact and the static contact. In the opening and closing process, the shielding piece is driven by the moving contact under the action of the sliding groove and rotates around the rotating end relative to the moving contact, the structure is simple and compact,and the occupied rotating space is small.

Description

technical field [0001] The invention relates to a low-voltage electrical appliance, in particular to a small circuit breaker. Background technique [0002] In the DC power system, there is a critical current or a small current. Because DC does not have the characteristics of zero-crossing current like AC, the arc is not easy to extinguish. The opening distance between the contacts of the existing miniature circuit breaker is between 5mm-5.5mm. When the circuit breaker breaks the critical current or small current, it cannot elongate the arc, and the arc continues to burn, which is difficult to extinguish and has a long burning time. It is beneficial to the normal use of the circuit breaker. Some existing circuit breakers are equipped with shields for shielding the moving contacts and static contacts, but their structures are relatively complicated, and the coordination of various parts is relatively cumbersome, and a certain space is required in the circuit breaker, which is...

AI Technical Summary

Problems solved by technology

The opening distance between the contacts of the existing miniature circuit breaker is between 5mm-5.5mm. When the circuit breaker breaks the critical current or small current, it cannot elongate the arc, and the arc continues to burn, which is difficult to extinguish and has a long burning time. Conducive to the normal use of circuit breakers

Some existing circuit breakers are equipped with shields for shielding moving contacts and static contacts, but their structures are relatively complicated, and the coordination of various parts is relatively cumbersome, and a certain amount of space needs to be occupied in the circuit breaker, which is not conducive to the production and processing of the circuit breaker.

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