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The reed switch is an electrical switch operated by an applied magnetic field. It consists of a pair of contactson ferrous metal reeds in a hermetically sealed glass envelope. The contacts may be normally open, closing when a magnetic field is present, or normally closed and opening when a magnetic field is applied (It has common, normally open & normall closed terminals) .The switch may be actuated by a coil, making a reed relay, or by bringing a magnet near to the switch. Once the magnet is pulled away from the switch, the reed switch will go back to its original position.