ITEM NAME:DC 100V NC Contact Reed Switch Alarm Safety Sensor Distance 15-25mm img *{margin:0;padding:0;.Switch Type:NC (normally closed type), circuit is disconnected when magnet is near. Actuation Distance: 15-25mm. Maximum switch current: 0.5A. Switch Current: 0.5A. 1 x Magnetic Switch. Cable Length: Approx.