{"product_id":"440r-d22r2-allen-bradley-safety-relay-guardmaster-module","title":"440R-D22R2 Allen-Bradley Safety Relay Guardmaster Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 440R-D22R2\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e440RD22R2\u003c\/strong\u003e Safety Relay, operates as a dedicated hardware component for monitoring safety-related signal inputs within industrial control architectures.\u003c\/p\u003e\n\u003ch3\u003eModel Identification Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSeries: Guardmaster\u003c\/li\u003e\n\u003cli\u003eFunctional Class: Safety Monitoring Relay\u003c\/li\u003e\n\u003cli\u003eInput Configuration: Dual Channel\u003c\/li\u003e\n\u003cli\u003eEnclosure Type: DIN-rail Mountable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e440R-D22R2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e9.2 x 5 x 7.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Range\u003c\/td\u003e\n\u003ctd\u003e20.4 to 28.8 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e50 mA (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Contacts\u003c\/td\u003e\n\u003ctd\u003e250 V AC, 3 A, 30 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Control Integration\u003c\/h3\u003e\n\u003cp\u003eThe module is designed for I\/O density scaling within safety-rated control circuits. By monitoring feedback from safety switches, E-stops, or light curtains, the relay manages state transitions with deterministic timing. Firmware flash compatibility and standardized backplane logic allow for seamless integration into safety networks where fail-safe signal processing is required to inhibit hazardous machine operation during fault conditions.\u003c\/p\u003e\n\u003ch3\u003eOrdering Info\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e1 x 440R-D22R2 Safety Relay\u003c\/li\u003e\n\u003cli\u003e1 x Terminal block connector set\u003c\/li\u003e\n\u003cli\u003e1 x Technical manual\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMounting: Install the relay in an IP54 or higher rated cabinet to prevent ingress of conductive dust or moisture.\u003c\/li\u003e\n\u003cli\u003eOrientation: Mount vertically on a standard 35 mm DIN-rail to ensure adequate thermal convection across the heat-dissipating housing.\u003c\/li\u003e\n\u003cli\u003eWiring: Ensure wire termination follows the marked schematic; verify that input signals are synchronized to prevent nuisance tripping of the safety circuit.\u003c\/li\u003e\n\u003cli\u003eGrounding: Maintain a low-impedance connection to the system ground bus to protect against transient voltage spikes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the default state of the relay contacts?\u003c\/p\u003e\n\u003cp\u003eThe internal safety contacts are normally open and close only when the input conditions are satisfied and the internal logic confirms no fault exists.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDoes this relay support manual or automatic reset?\u003c\/p\u003e\n\u003cp\u003eThe relay configuration depends on the specific wiring of the reset loop; refer to the wiring diagram for configuring either monitored manual reset or automatic operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHow is the input signal monitored?\u003c\/p\u003e\n\u003cp\u003eThe relay monitors the dual-channel inputs for cross-channel faults; a mismatch in timing between channels will prevent the output contacts from closing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs the relay capable of hot-swapping?\u003c\/p\u003e\n\u003cp\u003eHot-swapping is not supported; ensure all power is removed and the system is in a safe state before disconnecting or replacing the relay module.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCan the relay be used with non-safety PLC signals?\u003c\/p\u003e\n\u003cp\u003eThe relay is intended for safety-rated devices; signal compatibility must be verified to ensure the safety integrity level of the machine remains compliant.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the maximum contact rating?\u003c\/p\u003e\n\u003cp\u003eThe output contacts are rated for 3 A at 250 V AC or 30 V DC; do not exceed these values to prevent welding of the internal relay contacts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIs there a built-in diagnostic indicator?\u003c\/p\u003e\n\u003cp\u003eThe front panel includes LED indicators that display the status of the power supply, safety inputs, and output contact state for simplified troubleshooting.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWhat is the recommended wire gauge for connections?\u003c\/p\u003e\n\u003cp\u003eUse stranded or solid copper wire between 0.2 and 2.5 mm squared; ensure terminal screws are tightened to the torque specification in the manual.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066474025133,"sku":"440R-D22R2","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/allen_bradley_440r-d22r2_4.jpg?v=1783867414","url":"https:\/\/www.maxwellplc.com\/ga\/products\/440r-d22r2-allen-bradley-safety-relay-guardmaster-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}