Allen‑Bradley Guardmaster 440N‑Z2NRS1A Magnetically Coded Non‑Contact Safety Interlock Switch

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1. Overview

The 440N‑Z2NRS1A belongs to Rockwell Automation Allen‑Bradley Guardmaster 440N series magnetically coded non‑contact safety interlock switches. Designed for monitoring movable safety guards, safety doors and access barriers on industrial machinery, this switch adopts non‑contact magnetic coded detection technology to eliminate mechanical wear caused by frequent physical contact. It delivers stable guard position monitoring, high misalignment tolerance and robust environmental adaptability, suitable for a wide range of automated production equipment.
This specific variant features MC1 magnetic coding, dual normally closed (N.C.) reed switch contacts, no built‑in LED status indicator, and integrated 3‑metre fixed cable. Paired with certified safety control modules or safety relays, it builds high‑integrity safety circuits to cut power to hazardous machine motion immediately when safety guards are opened.

2. Core Features

  • Non‑Contact Magnetic Coded Actuation

    Contactless sensing avoids mechanical abrasion, extends service life and reduces maintenance frequency. Unique MC1 coded actuator prevents simple magnet bypass and unauthorised tampering.

  • High Misalignment Tolerance

    Excellent tolerance to installation offset, door sag and minor guard deformation, lowering installation precision requirements and minimising on‑site adjustment work.

  • Dual Normally Closed Reed Safety Contacts

    Two independent N.C. reed switch outputs support dual‑channel safety wiring architecture, laying the foundation for high safety performance levels.

  • Compact Moulded Plastic Housing

    Small footprint with integrated mounting geometry for flexible installation on tight machine frames, safety doors and conveyor guard structures.

  • IP67 Environmental Protection Rating

    Dust‑tight and protected against temporary immersion; resistant to splashing water, suitable for general factory, packaging, material handling and light wash‑down environments.

  • No LED Indicator

    Simplified construction for cost‑effective basic safety monitoring applications where local visual status feedback is not required.

  • 3 m Pre‑Attached Fixed Cable

    Ready‑to‑wire cable design eliminates separate connector procurement and simplifies wiring layout.

3. Key Technical Specifications

Item Parameter
Model 440N‑Z2NRS1A
Series Guardmaster 440N Magnetically Coded Safety Switch
Coding Type MC1 Magnetically Coded
Contact Configuration 2 × Normally Closed (N.C.) Reed Contacts
Status Indicator Without LED indicator
Connection 3 m integrated fixed cable
Safe Make Distance 8 mm
Safe Break Distance 14 mm
Operating Voltage 24 V DC
Max Switching Current 200 mA
Protection Class IP67 (NEMA 6P)
Operating Temperature -10 °C ~ +55 °C
Housing Material Red moulded ABS plastic
Mechanical Service Life ≥1,000,000 operations
B10d Value > 2 × 10⁶ operations
MTTFd > 385 years
PFHD < 3 × 10⁻⁷

4. Safety Standard Compliance

  • ISO 14119: Type 4 interlock device with low coding
  • ISO 13849‑1: Supports PL d / PL e (depends on overall safety system architecture)
  • IEC 62061: Suitable for SIL 2 / SIL 3 safety related systems
  • IEC 60947‑5‑3
  • Approvals: cULus Listed, TÜV Certified, CE Marked
Note: Achievable safety category, Performance Level (PL) and SIL rating are determined by the complete safety system including safety relays, wiring and fault diagnostics.

5. Typical Applications

  • Safety hinged doors, sliding guards and removable protective barriers
  • Packaging machinery, material handling systems, conveyor lines
  • Machine tools, automated assembly equipment, robotic work cell perimeter guarding
  • Food & beverage processing, general automation production lines
  • Equipment requiring frequent guard opening with low maintenance expectation

6. Working Principle

The system consists of two parts: the sensor body (440N‑Z2NRS1A) and matched MC1 coded magnetic actuator mounted on the movable safety guard.

When the safety door is closed and the actuator is within effective sensing range, internal reed contacts remain closed to maintain the safety enable circuit.

Once the guard opens and the actuator moves beyond the break distance, the dual N.C. contacts open simultaneously, sending a safety stop signal to the safety control unit to disable dangerous machine movements.

7. Installation & Operation Notes

  1. Maintain minimum 5 mm clearance between switch assembly and ferrous metal surfaces to avoid magnetic interference.
  2. Control maximum mounting torque of fixing bolts ≤1.0 N·m to prevent housing damage.
  3. Must be matched with the original MC1 coded actuator; generic magnets cannot trigger the switch reliably.
  4. Implement dual‑channel wiring and suitable safety relay monitoring to realise certified safety performance.
  5. Conduct periodic functional inspection to verify normal switch operation without bypass risks.

8. Why Choose Rockwell Guardmaster 440N‑Z2NRS1A

Rockwell Automation Guardmaster safety products provide globally recognised machinery safety solutions. The 440N‑Z2NRS1A balances competitive cost, long service life and flexible installation. Non‑contact structure avoids premature failure from friction and impact. With full third‑party safety certification, it helps machine builders satisfy international machinery safety regulations, protect operators and reduce unplanned downtime.

9. Ordering Information

Model No.: 440N‑Z2NRS1A

Package includes: Safety switch sensor with 3 m cable + matching MC1 coded actuator

Standard warranty: 1 year from date of purchase

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