Residual current protection tripping mechanism and tripper

Abstract

The invention discloses a residual current protection tripping mechanism and a tripper, wherein the tripping mechanism comprises a draw bar and a jump pin which are interacted with each other, so the jump pin moves between a normal working position and a tripping position, the draw bar is provided with a first joint part and a second joint part, the first joint part is interacted with a residual current protection rod of a residual current protection device, so the draw bar moves, the jump pin is further actuated to trip, the second joint part is interacted with at least one of an overload protection device and a short circuit protection device, so the draw bar moves, and the jump pin is further driven to trip. The residual current protection device, the overload protection device, the short circuit protection device and the like use one tripping protection mechanism together, so the structure is simplified, and the cost is saved.

Description

Technical field [0001] The present invention relates to a molded case circuit breaker, and in particular to a thermal electromagnetic trip unit used for the molded case circuit breaker. The thermal electromagnetic trip unit can be matched with a residual current protector to realize overload protection and short circuit protection at the same time , It also realizes residual current protection. Background technique [0002] Molded case circuit breakers are widely used in medium and low voltage circuits to distribute electrical energy and protect circuits, power supplies and electrical equipment. [0003] Molded case circuit breakers are usually assembled with a trip unit, which performs protection functions, namely: overload protection, short circuit protection, delay protection, and leakage protection. As a traditional mechanical circuit breaker, thermal overload protection and short circuit protection are the main features. The thermal overload protection device is usually real...

AI Technical Summary

Problems solved by technology

[0006] In the circuit breaker of the prior art, although the cooperation between the residual current protection device and the thermal magnetic release mechanism can be realized, the tripping force provided by the residual current protection device is required to be large, and the design margin is small. Short-circuit faults, polluted mechanisms, etc., cause the release to fail to trip or trip by mistake, reducing reliability

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