Allen-Bradley 440N-Z21SS2H SensaGuard Non-Contact Safety Switch

Allen-Bradley 440N-Z21SS2H SensaGuard Non-Contact Safety Switch is an RFID-based interlock from the Guardmaster 440N family that guards access to hazardous equipment without physical contact. It pairs a rectangular plastic sensor with a rectangular plastic standard-code actuator, using a 25 mm interface to engage the safety path and deliver wear-free operation on enclosure doors and gates. This variant, with a copper-shield option available as 440N-Z21SS2H-CU, provides two normally closed safety contacts for use with safety relays or controllers to enforce lockout when a guard is opened. SensaGuard technology offers coded actuation to deter tampering and maintain consistent performance in demanding industrial environments. Typical applications include safeguarding enclosure doors on presses, conveyors, and robotic workcells where non-contact interlocks reduce wear, simplify maintenance, and support reliable safety-rated signaling. When integrated with a compatible safety controller, it supports standard safety circuits and monitoring required for compliant machine guarding.