A delay mechanism and circuit breaker

Abstract

The invention provides a delay mechanism and a circuit breaker, belonging to the field of circuit protection devices. Wherein, the delay mechanism includes a shell, an electromagnetic coil, a static iron core and a moving iron core. The electromagnetic coil is wound on the outside of the casing, the static iron core is fixed in the casing, and the static iron core is slidably arranged in the casing. The moving iron core is provided with a limiting part and a trigger part, and the housing is provided with an elastic limiting part. The limiting part can constrain the elastic limiting part and limit the sliding of the moving iron core relative to the static iron core in the first direction. It is the direction in which the moving iron core slides close to the static iron core. When the electromagnetic coil is fed with an over-load current, the elastic limiter can be deformed and break away from the restraint of the limiter, so that the moving iron core slides in the first direction relative to the static iron core, so that the trigger member triggers the tripping mechanism. The time-delay process of this time-delay mechanism is the process in which the elastic limiter is not separated from the limiter, and the delay time is relatively long, which has a good delay effect.

Description

technical field [0001] The invention relates to the field of circuit protection devices, in particular to a delay mechanism and a circuit breaker. Background technique [0002] Short-circuit failures occur due to various reasons such as power supply systems and electrical equipment. The power supply system often relies on miniature circuit breakers to disconnect the circuit. Misoperation of miniature circuit breakers has always been a problem. When the short-circuit fault current exceeds the current level, the upper level, and even the next level, as for which level of miniature circuit breaker action is random, this is the problem of the miniature circuit breaker malfunctioning and tripping over the next level. In civil power supply lines, different sections of power supply cables have different DC resistances, so the line impedance formed by the length of the line plays a certain protective role: when a line short-circuit fault occurs at the user end, the line impedance li...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a time-delay mechanism to improve the problems of short delay time and poor delay effect of the time-delay mechanism.

[0005] The purpose of the present invention is to provide a circuit breaker to improve the problems of short delay time and poor delay effect of the circuit breaker

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