{"product_id":"allen-bradley-msr127tp-guardmaster-safety-relay","title":"Allen-Bradley MSR127TP Guardmaster Safety Relay","description":"\u003ch2\u003eAllen-Bradley MSR127TP Guardmaster Safety Relay\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 440R-N23114\u003c\/strong\u003e, also identified as the \u003cstrong\u003eMSR127TP\u003c\/strong\u003e Guardmaster safety relay, monitors dual-channel safety inputs and controls safety outputs.\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\u003eMSR127TP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCatalog Number\u003c\/td\u003e\n\u003ctd\u003e440R-N23114\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Line\u003c\/td\u003e\n\u003ctd\u003eGuardmaster MSR127TP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSafety Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e22.5 mm housing width; other dimensions not specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-5 deg C to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eApprox. 2.0 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VAC\/DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Inputs\u003c\/td\u003e\n\u003ctd\u003e1 NC, 2 NC, or light curtain PNP input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Outputs\u003c\/td\u003e\n\u003ctd\u003e3 NO safety contacts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuxiliary Output\u003c\/td\u003e\n\u003ctd\u003e1 NC auxiliary contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReset Modes\u003c\/td\u003e\n\u003ctd\u003eAutomatic\/Manual or Monitored Manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminals\u003c\/td\u003e\n\u003ctd\u003eRemovable screw terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Rating\u003c\/td\u003e\n\u003ctd\u003eIP40 enclosure \/ IP20 terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Indicators\u003c\/td\u003e\n\u003ctd\u003ePWR, IN 1, IN 2 LEDs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Design\u003c\/td\u003e\n\u003ctd\u003eDIN rail, 22.5 mm wide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Safety Relay Input and Output Architecture\u003c\/h3\u003e\n\u003cp\u003eThe MSR127TP accepts single-channel or dual-channel safety input configurations according to the connected field device.\u003c\/p\u003e\n\u003cp\u003eSupported input arrangements include dual normally open contacts, dual normally closed contacts, and compatible light curtain PNP outputs.\u003c\/p\u003e\n\u003cp\u003eThe relay provides three normally open safety outputs and one normally closed auxiliary output for connected control circuits.\u003c\/p\u003e\n\u003cp\u003eReset selection supports Automatic\/Manual operation or Monitored Manual reset through terminal cross-wiring.\u003c\/p\u003e\n\u003cp\u003eStatus LEDs identify power availability and the states of input channels IN 1 and IN 2 during operation.\u003c\/p\u003e\n\u003cp\u003eThe removable screw-terminal arrangement permits field wiring termination while maintaining the compact DIN rail housing format.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the MSR127TP operate with a single-channel safety input?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The supplied specifications identify single-channel and dual-channel input configurations, including NC contact arrangements.\u003c\/p\u003e\n\u003cp\u003eQ: What output contacts are provided by the MSR127TP?\u003c\/p\u003e\n\u003cp\u003eA: The relay provides three normally open safety outputs and one normally closed auxiliary output.\u003c\/p\u003e\n\u003cp\u003eQ: What should be considered when installing the relay on a DIN rail?\u003c\/p\u003e\n\u003cp\u003eA: Maintain secure DIN rail engagement, provide wiring clearance, and separate safety circuits from high-current conductors to reduce electrical interference.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the relay securely on the specified DIN rail and verify mechanical engagement before wiring.\u003c\/li\u003e\n\u003cli\u003eConfirm the 24 VAC\/DC supply polarity and terminal assignments against the applicable wiring documentation.\u003c\/li\u003e\n\u003cli\u003eRoute safety input wiring separately from high-current switching conductors and motor power cables.\u003c\/li\u003e\n\u003cli\u003eAvoid parallel routing with high-noise conductors where electromagnetic coupling could affect input signals.\u003c\/li\u003e\n\u003cli\u003eConnect cable shields according to the machine grounding design and applicable electrical installation standards.\u003c\/li\u003e\n\u003cli\u003eUse the specified removable screw terminals and verify conductor retention after tightening.\u003c\/li\u003e\n\u003cli\u003eSelect Automatic\/Manual or Monitored Manual reset only after confirming the required machine safety circuit behavior.\u003c\/li\u003e\n\u003cli\u003eVerify each safety input independently before connecting the safety outputs to the final control circuit.\u003c\/li\u003e\n\u003cli\u003eConfirm PWR, IN 1, and IN 2 LED states during commissioning and fault investigation.\u003c\/li\u003e\n\u003cli\u003eVerify the enclosure and terminal protection requirements before installation in contaminated or exposed environments.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43874655404122,"sku":"440R-N23114","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/440R-N231142.jpg?v=1787218868","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-msr127tp-guardmaster-safety-relay","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}