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A double pole relay has two independent and isolated contacts. Each of these poles can operate individual circuits. There are three types of relay poles Form A relays are SPST with a default state of normally open. Form B relays are SPST with a default state of normally closed. Form C relays are SPDT and break the connection with one throw before making contact with the other (break before make). When the relay coil is energized these contacts reverse. The closed contact opens and the open contacts close.

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