{"product_id":"440r-em4r2-allen-bradley-guardmaster-em-safety-relay-expansion-module","title":"440R-EM4R2 | Allen-Bradley | Guardmaster EM Safety Relay Expansion Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 440R-EM4R2\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eserves as a high-density expansion solution within the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eGuardmaster Safety Relay (GSR)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efamily. 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\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoriginal 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.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen-Bradley \/ Rockwell Automation\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProduct Line\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGuardmaster Safety Relays (GSR)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eEM (Expansion Module)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24V DC PELV\/SELV\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.5 Watts\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower-On Delay\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e5.5 Seconds\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-5°C to +55°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEnclosure Rating\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIP40\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTerminal Rating\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIP20\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWire Size Range\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24 to 14 AWG\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePollution Degree\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLevel 2\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.00 lbs (1.36 kg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSingle-Wire Safety (SWS) Implementation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInstantaneous Output Response:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUnlike 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCompact DIN Rail Footprint:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRugged Environmental Tolerance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFlexible Termination Options:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the 440R-EM4R2 function as a standalone safety relay?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the significance of the 5.5-second Power-On Delay?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use this module for a Category 1 (delayed) stop?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a genuine, factory-sealed unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. We guarantee this 440R-EM4R2 is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52532506427701,"sku":"440R-EM4R2","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/440R-EM4R2D_f92ff80b-2b1d-4e3a-ba50-60e70f9efe02.jpg?v=1775210211","url":"https:\/\/www.5gplc.com\/products\/440r-em4r2-allen-bradley-guardmaster-em-safety-relay-expansion-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}