A miniature circuit breaker

By incorporating synchronously moving blocking components and baffles into the operating mechanism of miniature circuit breakers, the problem of high-temperature thermal shock to the locking linkage by electric arc gas is solved, thereby improving the lifespan of the locking linkage and the reliability of the circuit breaker.

CN116598176BActive Publication Date: 2026-07-07ZHEJIANG TENGEN ELECTRIC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG TENGEN ELECTRIC
Filing Date
2023-06-12
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

When existing miniature circuit breakers break, the arc gas can easily impact the locking linkage directly from the contact breaking point, causing deformation or damage and affecting the reliability and lifespan of the operating mechanism.

Method used

A blocking component is installed in the operating mechanism, which moves synchronously with the mechanism and blocks the side of the locking linkage component near the moving and stationary contacts. By setting a baffle on the mounting surface of the operating mechanism, the arc gas is prevented from directly impacting the locking linkage component, thereby reducing high-temperature thermal shock.

Benefits of technology

It improves the lifespan of the locking linkage, reduces the frequency of inter-pole short circuits, enhances the short-circuit breaking capacity of the circuit breaker, and improves the overall lifespan and reliability of the product.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116598176B_ABST
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Abstract

The application discloses a small circuit breaker, comprising a shell, a moving contact and a static contact in the shell, and an operating mechanism for controlling the connection and disconnection of the moving contact and the static contact; the operating mechanism comprises a support, a transmission assembly, a lock catch and a lock catch linkage, the lock catch is rotationally arranged on one surface of the support, the lock catch linkage is arranged on another surface of the support and fixes the lock catch on the support; the transmission assembly is engaged with the lock catch to ensure that the circuit breaker is stably in a fixed linkage state; wherein the operating mechanism further comprises a blocking piece, the blocking piece moves synchronously with the operating mechanism, and the blocking piece is arranged at least in the direction of the lock catch linkage close to the moving contact and the static contact, so as to reduce the high-temperature thermal impact of arc gas on the lock catch linkage during disconnection, and deformation or burning of the lock catch linkage caused by the high-temperature thermal impact, thereby causing unreliable inter-pole linkage; the application has the characteristics of long service life of the operating mechanism, prevention of short circuit caused by a small amount of flying arc charged ions between poles and the like.
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