Schmersal BNS33-12Z-2187-2M Safety Interlock Switch

The Schmersal BNS33-12Z-2187-2M is a coded-magnet safety interlock switch designed for movable machine guards and articulated robot arms, delivering reliable access control for safeguarded equipment. This BNS33-series device provides 1NO / 2NC contacts with a maximum current of 250 mA and a contact voltage up to 100 V (AC/DC), using a coded-magnet actuator and multiple reed switches wired in series to ensure the switch only closes in the matched magnetic field arrangement. It ships with a 2-meter cable and quick-connect terminals for straightforward wiring, and there is an option for an LED status display to indicate switch state. Some configurations also offer a 1-meter prewired pigtail to help maintain sealing integrity. Ideal for safety interlock applications on movable guards, access doors, protective enclosures, and robot-assisted equipment where tamper-resistant sensing and reliable interlock performance are essential.