Reed Proximity Switch - 

The PRA/240/30 is a 5mm Reed Proximity Switch with blue nylon 66 case, 2 x round 0.14mm² PVC covered grey and insulated brown/white cable. This proximity switch is operated by a moving magnet and can be used to detect many directions of movement. When the magnet reaches the operate distance from the reed switch, the reed switch contacts (cylindrical, normally open) will operate. Moving the magnet away will cause the reed switch contacts to switch back to their original position. Suitable for position and limit sensing, linear actuators, security system switch and door switch applications.