Patent ID: 7157996
Filing Date: 2007-01-02
Classification: H01H

Abstract:
1. An electromagnetic switching device, comprising: an electromagnetic actuator, comprising a solenoid coil, a movable iron core, a first yoke disposed at one end of the solenoid coil and comprising an insertion hole, and a second yoke disposed at another end of the solenoid coil; a pair of fixed terminals, each of which has a fixed contact point at one end thereof and a terminal area connected to an external circuit at another end thereof; a movable contact, comprising a pair of movable contact points that contact and separate from the fixed contact points; first and second springs disposed between the movable contact and the first yoke, one of the first and second springs being stronger than another of the first and second springs; a shaft, comprising a retentive part at one end thereof that retains the movable contact, the shaft being inserted through the insertion hole of the first yoke and being fixed to the movable iron core at another end thereof; and an enclosure which encloses the movable contact points and the fixed contact points, wherein the pair of movable contact points contact and separate from the fixed contact points by movement of the shaft by moving the movable iron core along an axis of the electromagnetic actuator, and the movable contact points and the fixed contact points are disposed in a substantially sealed space formed between the enclosure and the first yoke.