Allen-Bradley 440N-Z21S16H Guardmaster SensaGuard Non-Contact Safety Switch

Product Overview

The Allen-Bradley 440N-Z21S16H functions as a high-integrity safety solution within the SensaGuard non-contact interlock family. This switch utilizes advanced Radio Frequency Identification (RFID) technology to monitor the position of machine guards without physical contact. We supply this unit as 100% Brand New original factory stock, ensuring your safety circuits achieve Category 4/PLe ratings (ISO 13849-1) for high-risk industrial applications.

Technical Specifications

Engineering Advantages

• RFID Coded Security: The 440N-Z21S16H employs RFID technology to provide high resistance to tampering. Unlike traditional magnetic switches, this "Standard Code" unit prevents unauthorized bypass using simple magnets, ensuring operators cannot easily circumvent the safety system.

• Superior Misalignment Tolerance: The 18mm sensing distance accommodates significant door sag or guard misalignment. This hardware feature eliminates nuisance trips in heavy-duty environments where vibration or mechanical wear causes minor shifts in guard positioning over time.

• Simplified Series Wiring: Integrated OSSD (Output Signal Switching Device) outputs allow for the series connection of multiple SensaGuard switches while maintaining the highest safety rating. This architecture reduces the required I/O on your safety controller and simplifies cable management across large machine cells.

• Visual Diagnostic Feedback: A multi-color LED provides immediate status updates directly on the switch body. Technicians identify "Guard Closed," "Guard Open," or "Internal Fault" states at a glance, drastically reducing troubleshooting time during commissioning or downtime events.

• Washdown Ready Construction: The rectangular plastic housing resists common industrial chemicals and high-pressure washdown procedures. Its non-contact nature removes mechanical wear points, making it ideal for food processing, pharmaceutical, and packaging lines.

FAQs

• What is the difference between "Standard" and "Unique" coding?

  The 440N-Z21S16H uses Standard Coding, meaning any SensaGuard actuator of the same type will trigger the switch. For applications requiring a one-to-one match between a specific sensor and its actuator to prevent all forms of bypass, you should select a "Unique Coded" version.

• Can I mount this switch directly onto metal surfaces?

  Yes, but metallic environments can slightly reduce the effective sensing distance. We recommend maintaining a small non-metallic buffer or testing the 18mm range during installation to ensure consistent switching performance.

• Does this unit include the mounting brackets?

  The module typically includes standard mounting hardware; however, for complex angles or specialized guard frames, you may require additional 440N brackets (sold separately).

• How do I confirm this unit is brand new?

  We guarantee every 440N-Z21S16H arrives in its Original Allen-Bradley Factory Packaging with intact serial numbers. As a 100% Brand New item, the housing will show zero mounting marks, and the RFID pairing has never been initiated in a field environment.