Patent ID: 8570125
Filing Date: 2013-10-29
Classification: H01H

Abstract:
1. An electromagnetic switch, comprising: an arc-extinguishing chamber receptacle; a contact device having a pair of fixed contacts fixed to maintain a predetermined interval and a movable contact disposed to be connectable with the pair of fixed contacts, inside the arc-extinguishing chamber receptacle; and an electromagnetic device driving the movable contact, and including a cylindrical exciting coil, a fixed iron core passing through a center of the exciting coil, a magnetic yoke covering an outer side of the exciting coil, and a movable iron core facing the fixed core and the magnetic yoke and disposed in the arc-extinguishing chamber receptacle, wherein armature surfaces of the fixed core and the magnetic yoke are formed on a side of the contact device than the exciting coil, and the fixed iron core has a T-shape and includes a rod portion disposed in the exciting coil and immovably fixed thereto, and a plate portion covering a contact device side end portion of the exciting coil and fixed to a contact device side end portion of the rod portion so that when the exciting coil is excited, the movable iron core is attracted to the plate portion and is moved only in the arc-extinguishing chamber.