{"product_id":"allen-bradley-440r-w23221-guardmaster-msr330p-safety-relay","title":"Allen-Bradley 440R-W23221 Guardmaster MSR330P Safety Relay","description":"\u003ch2\u003eAllen-Bradley 440R-W23221 Guardmaster MSR330P Safety Relay\u003c\/h2\u003e\n\u003cp\u003eConfigured for immediate safety output switching in Guardmaster safety circuits, the \u003cstrong\u003eAllen-Bradley 440R-W23221\u003c\/strong\u003e (\u003cstrong\u003e440R-W23221\u003c\/strong\u003e Safety Relay Module) operates from 24 VDC control power. The MSR330P relay configuration provides three normally open safety outputs and one normally closed auxiliary output.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\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-W23221\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\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eGuardmaster Safety Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Type\u003c\/td\u003e\n\u003ctd\u003eMSR330P Safety Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eModular Monitoring Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.44 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e1.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Relays\u003c\/td\u003e\n\u003ctd\u003e3 normally open (NO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuxiliary Output\u003c\/td\u003e\n\u003ctd\u003e1 normally closed (NC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse Time\u003c\/td\u003e\n\u003ctd\u003e10 ms typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperation Mode\u003c\/td\u003e\n\u003ctd\u003eImmediate Output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eNo inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eDIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminals\u003c\/td\u003e\n\u003ctd\u003eRemovable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL, CE, CSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eGuardmaster MSR330P Safety Relay Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 440R-W23221 uses a 24 VDC control supply with three normally open relay outputs for safety switching. The supplied MSR330P configuration is identified as a modular monitoring safety relay with no inputs. Its typical response time is specified as 10 ms, supporting direct output operation after the associated control condition changes.\u003c\/p\u003e\n\u003cp\u003eThe module provides one normally closed auxiliary contact in addition to the three normally open outputs. Removable terminals provide detachable field wiring connections, while DIN rail mounting establishes the mechanical installation method.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What control voltage does the 440R-W23221 require?\u003cbr\u003eA: The supplied specification identifies a 24 VDC control voltage and 1.5 W power consumption.\u003c\/p\u003e\n\u003cp\u003eQ: How many relay contacts are provided?\u003cbr\u003eA: The module provides three normally open relay outputs and one normally closed auxiliary output.\u003c\/p\u003e\n\u003cp\u003eQ: Does the supplied data specify operating temperature or dimensions?\u003cbr\u003eA: No. The supplied technical data does not provide dimensional or operating-temperature values.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the module on a suitable DIN rail with mechanical clearance for removable terminal access. Verify that the 24 VDC supply polarity and voltage correspond with the equipment wiring documentation.\u003c\/p\u003e\n\u003cp\u003eRoute safety-related conductors separately from high-voltage power and high-current switching conductors where practical. Avoid parallel routing with variable-frequency drive output cables or other high-noise circuits.\u003c\/p\u003e\n\u003cp\u003eTerminate cable shields according to the system grounding design and applicable installation standards. Do not create unintended shield-current paths through multiple grounding points.\u003c\/p\u003e\n\u003cp\u003eVerify terminal identification before energizing the circuit, particularly when connecting the three normally open outputs and normally closed auxiliary contact. Confirm relay contact states through functional testing before placing the safety circuit into service.\u003c\/p\u003e\n\u003cp\u003eDo not infer missing environmental, dimensional, or electrical limits from the supplied information. Use the applicable manufacturer documentation when defining enclosure spacing, temperature limits, conductor ratings, or installation restrictions.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43874670346330,"sku":"440R-W23221","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/440R-W232212.jpg?v=1787219734","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-440r-w23221-guardmaster-msr330p-safety-relay","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}