The ZK4236-11Z-M20 is a safety interlock switch from the Schmersal product line. It is a mechanical key interlock with EN 50205/1-1 certification and is a Non-Contact Safety Switch. This switch has a double locking design with an interlock ring, actuator and a lock cylinder. It is designed for use in escape and rescue routes, doors, materials handling and other large machinery applications. It is IP67 rated for water and dust resistance, and has a breaking capacity of 500VA at 250VAC/45VDC.