Allen-Bradley 440N-Z21SS2BN9 Non-Contact Safety Switch

Allen-Bradley Guardmaster 440N-Z21SS2BN9 is a 24V DC RFID non-contact safety interlock from the SensaGuard family, packaged in a plastic housing with a 10 m cable. This 440N-series device uses coded RFID technology to verify the actuator before allowing access to a guarded area, delivering a non-contact interlock solution designed for machinery guarding in production environments. The unit is specified as part of the Guardmaster/SensaGuard line and is described as a non-contact interlock switch, suitable for integration with standard safety-relay architectures, with 3 PNP outputs for wiring in safety circuits. Its 10-meter cable length provides flexible mounting options for compact enclosures and longer reach between the door and the control system. As a 440N-Z21SS2BN9 model, it belongs to Allen-Bradley’s Sensaguard RFID non-contact interlocks, commonly used to secure access doors on safety guards and to help ensure the guard remains closed during machine operation.