Schmersal BNS33-11Z-2M Door Safety Interlock Switch

Schmersal BNS33-11Z-2M is a coded-magnet safety interlock switch in the BNS33 family, designed to secure movable machine guards and access points on automated equipment. It provides one normally open and one normally closed contact (1NO/1NC) with a rating up to 250 mA at 100 V. The model designation includes a 2-meter cable length (2 m), with additional length options available (2 m, 5 m, 10 m) per Schmersal documentation. The sensor is intended for use with Schmersal AES safety monitoring modules; multiple BNS33-11Z devices can be connected to a single AES module, wiring NO contacts in parallel and NC contacts in series to form a monitored safety circuit. The BNS33 series is a magnetically coded safety sensor that operates as a door interlock for movable guards or robot-arm enclosures. For correct operation, ensure the central marking of the actuator is within the base position area to produce a release signal at the safety module, with typical alignment around 0.5 x sao. Applications include safeguarding machine guards in manufacturing and automation environments, where the interlock ensures controlled access and safety-critical gating of hazardous zones. The device is designed for safety circuits requiring a reliable, coded-magnet interlock with straightforward wiring to safety controllers.