{"product_id":"allen-bradley-440r-w23218-guardmaster-msr320p-monitoring-safety-relay","title":"Allen-Bradley 440R-W23218 Guardmaster MSR320P Monitoring Safety Relay","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 440R-W23218\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a high-integrity Monitoring Safety Relay within the Guardmaster MSR320P series. This module provides a centralized logic interface for critical safety devices, including safety mats, light curtains, and E-stop circuits. It achieves a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCategory 4 (Cat 4)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003esafety rating, ensuring maximum fault detection and risk reduction in high-hazard zones. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, offering a vital replacement for this discontinued model to maintain your facility's safety compliance without requiring a full system redesign.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 440R-W23218 integrates versatile input logic with high-speed semiconductor outputs:\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\u003eSafety Series\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGuardmaster MSR320P\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSafety Rating\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCategory 4 (EN 954-1 \/ ISO 13849-1)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Configurations\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 NC, 2 NC, 3 NC, Safety Mat, or Light Curtain\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAuxiliary Outputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 PNP Semiconductor Outputs\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\u003eTerminal Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRemovable Terminal Blocks\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e35mm DIN Rail Mount\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\u003e0.75 lbs (0.34 kg)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStatus Indicators\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIntegrated LED Diagnostics\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-W23218 solves specific machine-guarding challenges through its advanced monitoring architecture:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMulti-Device Versatility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis single relay handles multiple input types, ranging from simple NC contacts to complex four-wire safety mats and OSSD signals from light curtains. This versatility reduces the variety of spare parts you need to stock.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRapid Field Serviceability:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe removable terminal blocks allow for \"hot-swappable\" physical replacement. Technicians replace the relay body in seconds without disconnecting individual wires, eliminating wiring errors during emergency maintenance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEnhanced Fault Diagnostics:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTwo dedicated PNP auxiliary outputs provide real-time status data to your PLC or HMI. This enables the control system to distinguish between a \"Guard Open\" state and an internal \"Device Fault,\" drastically reducing troubleshooting time.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh Interference Rejection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe internal circuitry filters out electrical noise typical of high-frequency motor drives. This prevents \"nuisance tripping\" in crowded control cabinets where safety and power cables share narrow wire ducts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I configure the 440R-W23218 for a safety mat versus a light curtain?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module utilizes internal logic selection via terminal jumpering. You must follow the specific wiring diagram for your device type—Safety Mat (4-wire) or Light Curtain (OSSD)—to ensure the relay correctly monitors for short circuits and cross-channel faults.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the PNP auxiliary outputs drive safety actuators directly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The two PNP outputs serve as auxiliary monitoring signals for PLCs or indicator lamps. To switch high-power safety actuators (like contactors), you must use this relay in conjunction with a safety-rated output expansion module or force-guided relays.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the benefit of the Cat 4 rating in this discontinued model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA Category 4 rating ensures that a single internal component failure does not lead to the loss of the safety function. Even as a discontinued part, the 440R-W23218 maintains this rigorous architectural standard, making it safer than lower-rated modern alternatives for high-risk machinery.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this unit a refurbished or \"pulled\" part?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAbsolutely not. We guarantee that every 440R-W23218 unit is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ein its original factory packaging. It contains original, un-aged internal components, ensuring it meets the 24V DC performance specifications and response times required by your original safety assessment.\u003c\/p\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53423099379896,"sku":"440R-W23218","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/440R-W23221_3dc36e9f-1307-4053-a17a-fa9dc2e098e1.jpg?v=1777540689","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-440r-w23218-guardmaster-msr320p-monitoring-safety-relay","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}