Fractional contact style feedback cyclic current self arc eliminating A.C. contactor

Abstract

The present invention is a feedback circulation-current self-arc-damping A.C. contactor of step contacting type in the technical field of electrical equipment and A.C. contactor, comprising a base plate, a square assembling case, three static contacts on the left side of the upper end of the case and three static contacts on the right side of the same, arc-damping shields in the upper end of the case, two sets of auxiliary normally closed contacts and two sets of auxiliary normally open contacts on the case, a sliding frame and a moving magnet; a coil and a static magnet in the case, six moving contacts on the sliding frame and six static contacts, wherein centric holes are provided in the moving contacts, step holes are provided in the static contacts, an insulating arc-damping collar is provided in the upper end of each static contact, two or three pairs of six pairs of the moving and static contacts have unequal spaces, wherein the static contact having small space is of convex type in which a spring is provided, an outer ring of static contact is provided on its outer edge, the outer ring of static contact is connected in its lower portion to a static contact holder, a silver contacting piece with a centric hole is provided under the moving contact having large space. When the contactor of the invention operating, four pairs of moving and static contacts contact with each other first, the other two pairs of moving and static contacts contact with each other later, or three pairs first and the other three pairs later. Thus, in the contactor of the invention, the contacting pressure is increased, the contacting resistance is decreased, the actuating current is decreased and the breaking ability is enhanced. The contactor of the invention serves to remove and to scatter electric arc and its operating life can be extended.

Description

Technical field: [0001] The invention belongs to electrical AC contactors, and in particular relates to a step-by-step contact type feedback loop self-extinguishing arc AC contactor. Background technique: [0002] The patent No. 98239790.9 "feedback loop arc extinguishing AC contactor" is composed of a bottom plate, a square assembly shell, three static contacts on the left side of the upper end of the shell and three static contacts on the right side, and an extinguishing switch on the upper end of the shell. Arc cover, two sets of normally closed auxiliary contacts and two sets of normally open auxiliary contacts on the shell, sliding frame and moving magnet in the shell, coil and static magnet, three sets of moving contacts on the sliding frame, and , Three sets of moving contacts and silver contacts on the lower end face have central holes, six static contacts have stepped holes, and the upper port of each static contact is covered with an insulating sleeve. Since the d...

AI Technical Summary

Problems solved by technology

Since the distance between the six moving contacts and the six static contacts of this AC contactor is the same, the contact pressure of the contacts is small and the connection resistance is large, so that the starting current is large, the breaking capacity is poor, and the electrical life is short. Because there are silver contacts under the moving contacts, the cost is high

Images