Schmersal AZ-16-ZVRK-M20 Electrical Safety Switch

Schmersal AZ 16 ZVRK-M20 is a heavy-duty, key-operated safety interlock switch designed for guarding doors on industrial machines. Part of the AZ 16 family, it provides one normally open and one normally closed contact (NO/NC) for monitoring both the door position and the safety circuit. The M20 variant features a cable entry sized M20 x 1 for wiring and is rated IP67 for dust and water resistance in harsh industrial environments. The device is double insulated, and NC contacts are specified with positive opening to ensure safe, guaranteed decoupling when the guard is opened. The AZ 16 family is classified under EN ISO 14119 as a type 2 interlocking device, reflecting its safety-rated interlock functionality as part of a complete machine-safety system. This model relies on a keyed actuator to securely lock the guard during operation, requiring deliberate action to disengage and remove the key, thereby preventing accidental re-arming of the safety circuit. Typical applications include guarding doors on presses, conveyors, and packaging lines, where reliable interlocking and independent monitoring of guard status are essential for operator protection.