Patent ID: 9564279
Date: 2017-02-07
CPC Classifications: H01H

Claim:
1. An electromagnetic switch, comprising: a pair of fixed contacts disposed and fixed in a contact housing case with a predetermined distance therebetween; a movable contact disposed in the contact housing case so as to contact and separate from the pair of fixed contacts; and an electromagnet unit which brings the movable contact into and out of contact with the pair of fixed contacts, wherein the electromagnet unit has a magnetic yoke enclosing an exciting coil, a movable plunger having a contact pole surface facing a contact pole surface of the magnetic yoke, and a linking shaft which links the movable plunger and the movable contact, and a holding force for holding the movable plunger is generated and formed on the contact pole surface of the magnetic yoke by magnetic fluxes generated by a flowing current flowing through the movable contact when the movable contact contacts the pair of fixed contacts, and a magnetic path generated by the exciting coil and overlapped with the magnetic fluxes flowing through the movable contact.