Schmersal AZ16ZVRK Key Interlock Safety Switch

Schmersal AZ16ZVRK is a 1NO/1NC key-interlock safety switch in the AZ16 family, designed to guard machine access points and enforce guard closure before the equipment can start. Available as a separate-actuator interlock, it ships in versions such as AZ16ZVRK-M16 and AZ16ZVRK-M20, with mounting diameters corresponding to M16 or M20 frames. The AZ16ZVRK-M20 version uses a fiberglass-reinforced thermoplastic housing for durability in demanding environments. The switch is keyed, requiring a matching actuator to operate, and provides a normally open and normally closed contact for safety circuit wiring. Electrical ratings commonly cited include 230 VAC or 24 VDC operation with a 4 A load rating for the 1NO/1NC contacts, compatible with standard safety relays or safety PLC inputs. These interlocks are intended for guarding doors and gates on industrial machinery and integrate with Schmersal safety systems to ensure verified guard engagement before enabling machine start; use cases include access-door protection on presses, conveyors, or CNC equipment. When selecting a variant, verify mounting size (M16 vs M20), actuator style, and the NO/NC configuration to align with your safety circuit design and enclosure dimensions.