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Schmersal BNS33S Non-Contact Safety Sensors
1 NO & 2NC

The Series BNS33S coded-magnet sensor is designed for use as a safety interlock switch on movable machine guards/articulating robot arms. Each sensor set consists of a multiple reed switch unit and a coded-magnet actuator. The reed switches, wired in series, will only close in the presence of their matched magnetic field array. Both switch and magnet assemblies are sealed to IP69K standards. Their tamper-resistant design prevents bypassing with a simple magnet or improperly coded magnetic field. In addition, the BNS module features an optional built-in LED display of switch status, and a 1-meter long prewired pigtail to assure sealing integrity.