A Quick Action Mechanism for a Current-Limiting Circuit Breaker

Abstract

The invention discloses a quick action mechanism for a current limiting type circuit breaker. The quick action mechanism comprises a base, a push rod, a press spring, a lock buckle and an insulation shaft, wherein the insulation shaft is synchronous with a circuit breaker movable contact, the base is fixedly arranged between two electrodes of the circuit breaker, the side surface of the base is provided with position limiting bulges and three lug bosses for realizing position limitation on other parts and providing the supporting for other parts, the lower end of the push rod is provided with a lower end bulge, two grooves arranged in the longitudinal direction are formed between the upper end of the push rod and the lower end of the push rod, a penetrating shaft and the lug bosses respectively pass through the grooves, one end of the press spring is fixedly arranged on the base, the other end of the press spring is fixedly arranged on the push rod, in addition, upward force is continuously provided for the push rod, and the lock buckle is sheathed on the base and can only do rotating movement. The quick action mechanism for the current limiting type circuit breaker has the advantages that the size is small and ingenious, the matching is compact, the quick action mechanism can be directly arranged on a circuit breaker body, under the condition of heavy short-circuit current, the quick action mechanism can be instantly triggered and can push the plastic lock buckle to be tripped, the time required by the short circuit action is shortened to the maximum degree, and the short circuit protection capability is improved.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, and more specifically, relates to a fast-acting mechanism of a current-limiting type circuit breaker with a short-circuit protection function under a large short-circuit current of the current-limiting type plastic case circuit breaker. Background technique [0002] Low-voltage circuit breakers, as protective appliances for low-voltage power distribution systems, can not only switch on and off circuits under load, but also automatically trip under short-circuit, overload and low voltage (loss of voltage). At present, when current-limiting circuit breakers deal with large short-circuit currents, they often use two-stage mechanisms. There are many triggering links and it takes a long time to trigger. Therefore, the circuit breaker needs to be equipped with a fast-acting device to quickly trigger when large short-circuit currents occur. mechanism. At present, such devices are mostly...

AI Technical Summary

Problems solved by technology

At present, when current-limiting circuit breakers deal with large short-circuit currents, they often use two-stage mechanisms. There are many triggering links and it takes a long time to trigger. Therefore, the circuit breaker needs to be equipped with a fast-acting device to quickly trigger when large short-circuit currents occur. mechanism

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