Patent ID: 9484173
Filing Date: 2016-11-01
CPC Classification: H01H

Claim Text:
1. An electromagnetic switch, comprising: a pair of fixed contacts fixed in a contact housing case with a predetermined distance therebetween; a movable contact disposed in the contact housing case to contact to and separate from the pair of fixed contacts; and an electromagnet unit causing the movable contact to contact to and separate from the pair of fixed contacts, wherein the electromagnet unit has a magnetic yoke enclosing an exciting coil, a movable plunger disposed to move through a through hole provided in the magnetic yoke and having a peripheral flange portion which extends radially outwardly and a contact pole surface formed at the peripheral flange portion and facing a contact pole surface of the magnetic yoke, and a linking shaft linking the movable plunger and the movable contact, and the contact pole surface of the movable plunger includes a circular protruding portion having a width narrower than that of a surface facing the magnetic yoke for increasing a magnetic flux density.