440R-EM4R2 | Allen-Bradley | Guardmaster EM Safety Relay Expansion Module

Product Overview

The Allen-Bradley 440R-EM4R2 serves as a high-density expansion solution within the Guardmaster Safety Relay (GSR) family. This module increases the number of available safety-rated outputs in a control system by linking directly to a base safety relay via a single-wire connection. We supply this unit as 100% Brand New original factory stock. It provides instantaneous relay outputs for machinery requiring Category 4, SIL 3, or PLe safety ratings, ensuring immediate power removal upon a safety demand without the need for complex redundant wiring between modules.

Technical Specifications

Engineering Advantages

• Single-Wire Safety (SWS) Implementation: The 440R-EM4R2 utilizes a single-wire link to synchronize with the master safety relay. This architecture eliminates the need for multiple hardwired jumpers between modules, significantly reducing cabinet labor and the risk of cross-wiring errors in complex safety strings.

• Instantaneous Output Response: Unlike delayed expansion modules, the EM4R2 triggers its safety contacts immediately upon receiving a trip signal from the base unit. This ensures the fastest possible stop-time for high-risk machinery like mechanical presses, robotic cells, and fast-moving conveyors.

• Compact DIN Rail Footprint: The slim housing design allows for high-density mounting on standard 35mm DIN rails. This solves the engineering challenge of adding safety-rated outputs to existing control panels with limited open space.

• Rugged Environmental Tolerance: The module operates reliably across a temperature range of -5°C to +55°C and handles up to 90% relative humidity. The IP40-rated enclosure protects internal electronics from large debris and dust typically found in industrial manufacturing environments.

• Flexible Termination Options: The terminals accept a wide range of wire gauges (24 to 14 AWG). This versatility allows engineers to use standard industrial control wiring or thinner communication-grade cables for the SWS link, providing flexibility in harness design.

FAQs

• Does the 440R-EM4R2 function as a standalone safety relay?

  No. This is an Expansion Module (EM). It requires a base Guardmaster safety relay (such as the 440R-DI22P2 or 440R-GL2S2P) to initiate the safety logic and drive the expansion signal.

• What is the significance of the 5.5-second Power-On Delay?

  This delay represents the internal self-test period. Upon initial power-up, the module performs a diagnostic check of its internal circuitry and relays to ensure hardware integrity before allowing the safety outputs to energize.

• Can I use this module for a Category 1 (delayed) stop?

  No. The 440R-EM4R2 provides instantaneous outputs. For applications requiring a timed or delayed stop (Category 1), you should utilize the 440R-EM4R2D (delayed) version instead.

• Is this a genuine, factory-sealed unit?

  Yes. We guarantee this 440R-EM4R2 is 100% Brand New. It ships in its original Allen-Bradley factory packaging with intact security labels. Every unit features pristine terminal screws and a verifiable manufacturing date code.