Electromagnetic short current protective mechanism for breaker

Abstract

An electromagnetic short current protective mechanism for a breaker belongs to the technical field of low voltage electric appliances. The protective mechanism is characterized by comprising an iron core, an elastic element and a lock catch actuating device, wherein the iron core is used for being arranged on the upper part of one end along the length direction of an arc extinguish chamber shell of the breaker and is matched with an upper fixed contact arranged on the arc extinguish chamber shell; the elastic element is supported on the upper fixed contact; and the lock catch actuating deviceof a lock catch is used for actuating a breaker operating mechanism, and the lock catch actuating device is hinged on the arc extinguish chamber shell and is contacted with the elastic element. The protective mechanism has the advantages of having concise structure, saving space usage, improving operational reliability and stability of the breaker and ensuring personal safety and the safety of circuits and power equipment. Meanwhile, the protective mechanism guarantees the internal isolation level and has good processing safety particularly when a roof cover of the breaker is opened to performmaintenance or replace internal attachments.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an electromagnetic short-circuit protection mechanism of a circuit breaker, which is used for actuating a latch of an operating mechanism of the circuit breaker to trip the circuit breaker. Background technique [0002] Circuit breakers are suitable for low-voltage distribution networks to distribute electrical energy and protect lines. The circuit breakers have overload, short-circuit and under-voltage protection functions to avoid damage to lines and power equipment. Among them, the short-circuit protection mechanism is an extremely important mechanism in the circuit breaker, because the length of the action time of the short-circuit protection mechanism will directly affect the breaking capacity of the circuit breaker. [0003] In the existing rotary double breakpoint circuit breaker, the structure of the short-circuit protection mechanism...

AI Technical Summary

Problems solved by technology

It is precisely because of the indirect actuation mode of the transition of the ejector rod that the armature moves to the ejector rod, and the time for the ejector rod to push the lock of the circuit breaker operating mechanism cannot be shortened, resulting in the following problems: On the one hand, the circuit breaker disconnects the fault circuit Low reliability and poor stability; on the other hand, it is not conducive to reducing the impact of short-circuit faults on personal safety, lines and power equipment

In addition, the structure of the technical solution of CN101373688A is relatively bloated, and the configuration of such a structure will be limited when the housing space of the circuit breaker is limited, for example

In addition, when the upper cover of the circuit breaker is opened for maintenance or replacement of internal accessories, since the first bracket and the yoke are metal conductors, they are easily charged and exposed outside, making it difficult to guarantee operational safety, and the internal insulation level poor

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