Protection mechanism and circuit breaker thereof

Abstract

The invention provides a protection mechanism and a circuit breaker thereof. The protection mechanism comprises a push rod, and a leakage driving structure and a short circuit driving structure which can drive the push rod to move. The push rod can be mounted inside a circuit breaker in a way which enables the push rod to move back and forth along the axis thereof. The push rod has an initial position at which the push rod does not affect the action of the circuit breaker, and a trigger position at which the push rod triggers the circuit breaker to trip. When leakage occurs, the leakage driving structure drives the push rod to move from the initial position to the trigger position to trip the circuit breaker and break the circuit. When a short circuit occurs, the short circuit driving structure drives the push rod to move from the initial position to the trigger position to trip the circuit breaker and break the circuit. According to the protection mechanism, no matter whether leakage or a short circuit occurs, the circuit breaker can be triggered to trip, and thus, higher safety is achieved. On the basis of the prior art, the function of short circuit protection is achieved by only adding the short circuit driving structure which drives the push rod to move under the condition of a short circuit. The protection mechanism has the advantages of compact structure and low cost.

Description

technical field [0001] The invention relates to the technical field of small leakage circuit breakers, in particular to a protection mechanism and a circuit breaker with the same. Background technique [0002] Small earth leakage circuit breakers in the prior art usually include multiple poles, such as 2P circuit breakers, 3P circuit breakers, and 4P circuit breakers, which are 2-pole, 3-pole and 4-pole circuit breakers respectively, one of which is N-pole (that is, zero pole). line pole), and the rest are phase line poles. In order to make the circuit breaker have a leakage protection function, a leakage protection mechanism is generally installed on the N pole. Common leakage protection mechanisms in the prior art include: zero-sequence transformers, leakage coils, moving iron cores, push rods, operating mechanisms, and dynamic and static contacts set on the neutral line. When leakage occurs, the zero-sequence transformer will An unbalanced current will be generated, whic...

AI Technical Summary

Problems solved by technology

[0006] Another problem to be solved by the present invention is to overcome the technical defect that the leakage circuit breaker in the prior art cannot add a short-circuit protection mechanism while maintaining a compact structure and low cost, thereby providing a circuit breaker with both leakage protection function and short-circuit protection functional, compact, and low-cost circuit breaker

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