A core assembly applied to a miniature circuit breaker and a production method of a static core

Abstract

This invention discloses a core assembly and a method for manufacturing a stationary core for miniature circuit breakers, belonging to the field of circuit breaker technology. The core assembly includes a coil shell, a push rod, a stationary core, a moving core, and a spring. A stationary core is fixedly disposed inside the top of the coil shell, with a through hole at its center. The push rod slides through the through hole inside the stationary core. A moving core is disposed inside the bottom of the coil shell, with a spring between the moving core and the stationary core. The push rod passes through the through hole and the spring, abutting against the moving core, with a portion of the moving core inserted into the push rod. The through hole includes a first through hole, a second through hole, and a third through hole. When the push rod enters the stationary core, it passes through the first through hole, the second through hole, and the third through hole in sequence. This invention reduces the mutual collision between the push rod and the stationary core, preventing push rod breakage; it eliminates burrs, reduces friction between the push rod and the stationary core, reduces mutual collision, prevents push rod breakage, and increases the service life of the push rod and the core assembly.

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