A-B 440N-Z21S17A Guardmaster Safety Switch

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      • The Allen-Bradley 440N-Z21S17A is a Guardmaster SensaGuard RFID non-contact safety switch with an 18 mm stainless-steel cylindrical barrel and standard-coded actuator. It provides two safety outputs and one auxiliary output for monitoring machine guards and doors.

        Key Technical Specifications

        Parameter	Specification
        Brand	Allen-Bradley / Rockwell Automation
        Model	440N-Z21S17A
        Product Type	Non-Contact Safety Switch
        Product Family	Guardmaster SensaGuard
        Housing	18 mm Stainless Steel Barrel
        Actuator	18 mm Stainless Steel Standard-Coded Actuator
        Assured Sensing Distance	15 mm (0.59 in.)
        Safety Outputs	2 × PNP, 0.2 A max.
        Auxiliary Output	1 × PNP, 0.2 A max.
        Supply	24 V DC class
        Door Status Indication	LED
        Connection	3 m PVC Cable
        Coding	Standard Code
        Status	Active
        Country of Origin	Dominican Republic

        Rockwell identifies the 440N-Z21S17A as an active SensaGuard non-contact switch with a 3 m PVC cable, 15 mm assured sensing distance, LED diagnostics, and 2 safety + 1 auxiliary PNP outputs.

        Advantages & Features

        • Non-contact RFID safety sensing
        • Stainless-steel 18 mm cylindrical housing
        • Standard-coded actuator included
        • Two safety outputs for safety circuit integration
        • Auxiliary output for status monitoring
        • LED door-status and diagnostic indication
        • 3 m factory-attached PVC cable
        • Compact design for machine guarding

        Typical Applications

        • Machine guard and door monitoring
        • Industrial machinery safety
        • Packaging equipment
        • Robotic cells
        • Automated production lines
        • Material-handling equipment
        • Factory safety systems

        Important Precautions

        • Verify the safety switch is compatible with the safety relay/controller being used.
        • Maintain the specified sensing distance and correct actuator alignment.
        • Follow the manufacturer's safety wiring and reset requirements.
        • Safety circuits should be designed and validated according to the applicable machinery safety standards.
        • Disconnect power before installation or wiring.

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