Electromagnetic switch

An electromagnetic switch, comprising:

• a contact device having a pair of fixed contacts maintaining a predetermined interval therebetween and fixed inside an arc extinguishing chamber housing, and a movable contact disposed to be capable of contacting with and separating from the pair of fixed contacts;
• and
• an electromagnetic device having a movable plunger moving between an opened position wherein the movable contact separates from the fixed contacts and a closed position wherein the movable contact contacts with the fixed contacts to press down,
• wherein the arc extinguishing chamber housing is provided with permanent magnets to extinguish an arc generated at an opening time when the movable contact separates from the fixed contacts from a state in the closed position in which the movable contact contacts with the fixed contacts, and
• in a state in which the movable plunger is in the opened position, a magnetic circuit is formed starting from the permanent magnets and returning to the permanent magnets through the movable plunger.