Electromagnetic switch

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 having 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 disposed in the arc-extinguishing chamber receptacle and facing the fixed core and the magnetic yoke,
• wherein armature surfaces of the fixed core and the magnetic yoke are formed on a side of the contact device than the exciting coil,
• 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 immovable disposed over the exciting coil and connected to a contact device side end portion of the rod portion, and
• the magnetic yoke has two facing plate portions disposed above the exciting coil and horizontally arranged with respect to the plate portion to be spaced from two end portions of the plate portion of the fixed iron core with a magnetic gap therebetween.