Multi-range moving iron core assembly and magnetic tripping system including multi-speed moving iron core assembly

Abstract

The invention provides a multi-gear movable iron core assembly and a magnetic tripping system with the multi-gear movable iron core assembly. The multi-gear movable iron core assembly comprises an adjusting rod and an armature. A number of protrusions are sequentially arranged on one side of the adjusting rod from top to bottom, and a spring shaft is arranged on the other side. The magnetic tripping system with the multi-gear movable iron core assembly comprises a bracket, a thermal element, a bimetal, a static iron core and the movable iron core assembly. The movable iron core assembly is the multi-gear movable iron core assembly. The movable iron core assembly is rotatably arranged on the bracket through a connecting shaft. A gearshift is arranged on the connecting shaft on one side of the protrusions of the movable iron core assembly. The protrusions match the gearshift, and the magnetic tripping system provided by the invention realizes a shifting function. The rated short-circuit current protection value of the movable iron core and the magnetic tripping system can be adjusted.

Description

technical field [0001] The invention relates to a short-circuit protection element of a molded case circuit breaker, in particular to a multi-position movable iron core assembly for the molded case circuit breaker and a magnetic tripping system comprising the multi-position movable iron core assembly. Background technique [0002] The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. The molded case circuit breaker includes a casing made of plastic insulators and a control component installed inside the casing. Molded case circuit breakers usually include overload protection and Two functions of short-circuit instantaneous protection. Among them, short-circuit instantaneous protection, that is, the sudden increase of current during short-circuit makes the moving iron core and static iron core in the magnetic tripping system attract each other, and pushes the drawbar to trigger the free tripping mechanism to release ...

AI Technical Summary

Problems solved by technology

[0003] The moving iron core in the prior art usually uses a single magnetically permeable metal, and the magnetic tripping system containing this kind of moving iron core usually adopts a "U"-shaped clapping type or a "T"-shaped suction type. However, whether it is " There will be magnetic flux leakage problems in both the U”-shaped snap-and-type magnetic trip system and the “T”-shaped suction-type magnetic trip system, and the attraction characteristics between the moving iron core and the static iron core of this type of magnetic trip system are relatively Flat, rated current protection value is single and unchangeable, the moving iron core and magnetic tripping system in the prior art cannot adapt to the instantaneous value of different short-circuit currents according to different situations

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