440R-EM4R2D | Allen-Bradley Guardmaster EMD Expansion Module Safety Relay

Product Overview

The Allen-Bradley 440R-EM4R2D serves as a high-performance Guardmaster EMD expansion module designed to increase the number of safety-related outputs in a control system. This module utilizes Single-Wire Safety (SWS) technology to link seamlessly with a base safety relay, providing four additional Normally Open (N/O) time-delayed relay outputs. We supply this unit as 100% Brand New original factory stock, ensuring your safety circuits meet the rigorous demands of SIL 3 and PLe performance standards while providing controlled deceleration for industrial machinery.

Technical Specifications

Engineering Advantages

• Single-Wire Safety (SWS) Integration: The 440R-EM4R2D accepts a single-wire safety signal from a master GSR relay. This architecture eliminates complex redundant wiring between modules, reducing installation time and potential points of failure within the safety string.

• Configurable Time Delays: This EMD module provides precise control over power-down sequences. Engineers set specific time delays for the four relay outputs, allowing motors to ramp down or machines to reach a stationary state before the safety system removes final power (Category 1 Stop).

• High-Density Output Expansion: Measuring just 22.5mm wide, this module adds four safety-rated contacts to the system without consuming excessive DIN rail space. This compact form factor solves the challenge of upgrading safety functionality in crowded legacy control cabinets.

• Diagnostic Feedback: The integrated solid-state auxiliary output provides real-time status data to a PLC or HMI. This allows maintenance teams to distinguish between a safety trip and a module fault instantly, significantly reducing mean time to repair (MTTR).

• Broad Environmental Tolerance: The 440R-EM4R2D operates reliably in standard industrial conditions. Its rugged internal relays handle inductive loads, providing a robust interface between low-voltage logic and high-power motor contactors or actuators.

FAQs

• Does the 440R-EM4R2D function as a standalone safety relay?

  No. This is an expansion module. It requires a Single-Wire Safety (SWS) signal from a base Guardmaster safety relay (such as a 440R-GL2S2P or 440R-DI22P2) to initiate its safety function.

• How do I set the specific time delay for the outputs?

  The front face of the module features rotary switches. These switches allow you to select the time range and the specific multiplier to achieve the desired delay for your specific application requirements.

• Can I daisy-chain multiple 440R-EM4R2D modules?

  Yes. You can connect multiple expansion modules to a single base relay using the SWS terminal, provided the total system stays within the current limits of the power supply and the master relay's drive capability.

• Is this a genuine factory-new unit?

  Yes. We guarantee this 440R-EM4R2D is 100% Brand New. It ships in its original Allen-Bradley factory packaging with intact security seals, ensuring the electromechanical relays have zero operations on them prior to your installation.