{"product_id":"allen-bradley-440r-w23221-guardmaster-msr330p-modular-safety-relay","title":"Allen-Bradley 440R-W23221 Guardmaster MSR330P Modular Safety Relay","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 440R-W23221\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebelongs to the Guardmaster MSR330P family, functioning as a high-performance modular monitoring safety relay. This unit specifically serves as a Group 1 output expansion module within a modular safety system. It provides essential logic-controlled switching for machine guarding applications, ensuring safe shutdown procedures when the system detects a fault or emergency stop request. We supply this module as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eand original, providing a critical replacement path for systems utilizing this discontinued modular architecture.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 440R-W23221 utilizes a compact housing to deliver reliable safety switching capacity:\u003c\/p\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\u003eSeries\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGuardmaster MSR330P (Group 1)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Configuration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3 N.O. (Normally Open) \/ 1 N.C. (Normally Closed) Auxiliary\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNo Direct Inputs (Controlled via Base Module)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24V DC\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\u003e1.5 Watts\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e35mm DIN Rail\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFunctional Role\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eModular Monitoring Safety\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\u003e0.42 lbs (0.19 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\u003cp\u003eThe 440R-W23221 solves specific integration challenges in complex safety circuits:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModular Scalability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis relay functions within a modular \"plug-and-play\" architecture. You expand your safety output capacity by simply adding this Group 1 module to the MSR330 system, eliminating the need for extensive rewiring of the base controller.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSpace-Efficient Design:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe ultra-slim profile (weighing only 0.42 lbs) allows for high-density mounting on standard DIN rails. This solves the problem of \"cabinet bloat\" in facilities with limited enclosure space.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLow Thermal Footprint:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDrawing only 1.5 Watts, the module generates minimal heat. This permits side-by-side mounting without the risk of thermal derating or the need for specialized cooling fans in the control cabinet.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAuxiliary Feedback:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe inclusion of a 1NC auxiliary contact allows the PLC or monitoring system to verify the relay's mechanical state. This diagnostic loop prevents the machine from restarting if the safety contacts fail to cycle correctly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use the 440R-W23221 as a standalone safety relay?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The 440R-W23221 is a modular output expansion (Group 1). It requires an MSR330 series base module to provide the necessary logic and input monitoring. It does not possess its own safety inputs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary benefit of the MSR330P modular system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe MSR330P system separates the input monitoring logic from the output switching. This modularity allows you to replace a damaged output module like the 440R-W23221 without replacing the more expensive base logic unit, significantly reducing maintenance costs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a \"New-Old-Stock\" (NOS) item?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Since the manufacturer has discontinued this series, we source these units from factory-sealed surplus inventory. We guarantee the unit is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e, unused, and remains in its original Allen-Bradley packaging to ensure maximum reliability for your safety-critical system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I install the module on the DIN rail?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module features a standard 35mm DIN rail clip. Snap the unit onto the rail and ensure it makes proper contact with the modular bus connectors of the adjacent MSR330 base module to establish logic communication and power.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53423053013176,"sku":"440R-W23221","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/440R-W23221.jpg?v=1777540627","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-440r-w23221-guardmaster-msr330p-modular-safety-relay","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}