This safety interlock switch features an emergency release and is designed for use with an actuator key and solenoid. It has 2 normally open (NO) and 1 normally closed (NC) contacts. The switch has 3 conduits entries with M20 threading. The housing and head are made of die cast material for durability. To unlock the switch, it requires a +24 VDC power supply. It comes delivered with a standard key.