Contact arc quenching system and circuit breaker

By designing independent main contact and arc contact mechanisms in the circuit breaker, and using conductive and transmission connection components and independent arc extinguishing units, the problem of arc extinguishing system space compression caused by the increase in contact system size is solved, thereby improving the arc extinguishing capability and breaking performance of the circuit breaker.

CN224400351UActive Publication Date: 2026-06-23SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
Filing Date
2025-06-18
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In traditional circuit breakers, as voltage levels increase, the contact system enlarges, leading to a reduction in the space available for the arc-extinguishing system, which affects arc-extinguishing capability and breaking performance.

Method used

Design an arc extinguishing system with a main contact mechanism and an arc contact mechanism arranged side by side at intervals in different directions. They are synchronized by conductive and transmission connection components. The arc extinguishing unit is set independently from the arc contact mechanism to ensure that the arc extinguishing system has sufficient space. An independent arc extinguishing chamber and an arc ignition plate are used to guide the arc into the arc extinguishing chamber.

Benefits of technology

This improves the arc-extinguishing capability and breaking performance of the circuit breaker, ensuring that the arc can be effectively transferred and extinguished, and avoiding the space compression problem of the arc-extinguishing system caused by the increase in size.

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Abstract

The application discloses a contact arc extinguishing system and a circuit breaker. The contact arc extinguishing system comprises a contact system, at least one contact unit, each contact unit comprising a main contact mechanism and an arc contact mechanism which are independent of each other and are arranged side by side and spaced apart along a first direction; an arc extinguishing system, at least one arc extinguishing unit, the arc extinguishing unit corresponding to the contact unit one by one, and on the same side of the corresponding main contact mechanism, the arc extinguishing unit and the corresponding arc contact mechanism are spaced apart and electrically connected along a second direction; a connecting assembly, comprising a conductive connecting assembly and a transmission connecting assembly, the conductive connecting assembly connects the main contact mechanism and the arc contact mechanism to form a conductive loop, the transmission connecting assembly extends along the first direction, and the two ends of the transmission connecting assembly are respectively connected in a transmission mode to the main contact mechanism and the arc contact mechanism to control the synchronous action of the main contact mechanism and the arc contact mechanism. The contact arc extinguishing system and the circuit breaker have high arc extinguishing capacity and are aimed at improving the breaking performance of the circuit breaker.
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