{"product_id":"allen-bradley-440r-c23139-guardmaster-msr127tp-safety-relay","title":"Allen-Bradley 440R-C23139 Guardmaster MSR127TP Safety Relay","description":"\u003ch2\u003eAllen-Bradley 440R-C23139 Guardmaster MSR127TP Safety Relay\u003c\/h2\u003e\n\u003cp\u003eConfigured for dual-channel safety circuit monitoring, the \u003cstrong\u003eAllen-Bradley 440R-C23139\u003c\/strong\u003e (\u003cstrong\u003eMSR127TP\u003c\/strong\u003e Safety Relay) provides discrete safety control for emergency stops, safety gates, and light curtains.\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-C23139\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Model\u003c\/td\u003e\n\u003ctd\u003eMSR127TP\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 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 compact housing; 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\u003eLess than 2.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e24 V AC\/DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Inputs\u003c\/td\u003e\n\u003ctd\u003e1 dual-channel or 2 single-channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Outputs\u003c\/td\u003e\n\u003ctd\u003e3 NO immediate safety contacts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuxiliary Output\u003c\/td\u003e\n\u003ctd\u003e1 NC solid-state auxiliary contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Contact Rating\u003c\/td\u003e\n\u003ctd\u003e6 A at 250 V AC \/ 24 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReset Type\u003c\/td\u003e\n\u003ctd\u003eAutomatic\/Manual or Monitored Manual, configurable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Type\u003c\/td\u003e\n\u003ctd\u003eRemovable pluggable screw terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Protection\u003c\/td\u003e\n\u003ctd\u003eIP40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Protection\u003c\/td\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e35 mm DIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Rating\u003c\/td\u003e\n\u003ctd\u003eCategory 4 per EN 954-1; SIL CL3 per IEC 62061; PL e per ISO 13849-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDiscrete Safety Control and I\/O Architecture\u003c\/h3\u003e\n\u003cp\u003eThe MSR127TP uses discrete safety inputs rather than a fieldbus communication interface for primary safety circuit evaluation. The input arrangement supports either one dual-channel circuit or two single-channel circuits, depending on the configured safety application.\u003c\/p\u003e\n\u003cp\u003eThe relay provides three normally open immediate safety contacts for switching the safety circuit. One normally closed solid-state auxiliary contact provides non-safety status signaling.\u003c\/p\u003e\n\u003cp\u003eThe TP configuration supports Transverse Fault Detection with pulse monitoring and configurable reset operation. Reset selection includes automatic\/manual and monitored manual modes according to the installed circuit configuration.\u003c\/p\u003e\n\u003cp\u003eNo Profinet or EtherNet\/IP interface is specified for the 440R-C23139. External wiring therefore carries the safety input, reset, output, and auxiliary signals directly through the removable screw terminals.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What supply voltage does the 440R-C23139 require?\u003c\/p\u003e\n\u003cp\u003eA: The safety relay operates from a 24 V AC\/DC supply, with power consumption below 2.5 W.\u003c\/p\u003e\n\u003cp\u003eQ: How many safety circuits can the MSR127TP monitor?\u003c\/p\u003e\n\u003cp\u003eA: The specified input arrangement supports one dual-channel safety circuit or two single-channel safety circuits.\u003c\/p\u003e\n\u003cp\u003eQ: Can the relay be mounted on a standard DIN rail?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The supplied specification identifies 35 mm DIN rail mounting for the 440R-C23139.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eInstall the relay on a 35 mm DIN rail with sufficient clearance for removable terminal access and conductor routing.\u003c\/p\u003e\n\u003cp\u003eVerify the 24 V AC\/DC supply before connecting safety inputs, reset circuits, or output contacts. Observe the specified terminal assignment during wiring.\u003c\/p\u003e\n\u003cp\u003eRoute safety-related conductors separately from high-current switching circuits and high-noise power conductors where practical. Avoid unnecessary parallel runs with motor or drive wiring.\u003c\/p\u003e\n\u003cp\u003eConnect cable shields according to the cabinet grounding design and applicable machine safety requirements. Do not use signal shields as protective conductors.\u003c\/p\u003e\n\u003cp\u003eCheck dual-channel wiring for correct channel separation and fault-detection behavior before placing the machine into service.\u003c\/p\u003e\n\u003cp\u003eFor automatic reset configurations, verify that the external machine safety design prevents unintended restart conditions. For monitored manual reset, verify the reset circuit and its physical operating location before commissioning.\u003c\/p\u003e\n\u003cp\u003eConfirm the enclosure and terminal protection requirements before installing the relay in environments containing conductive dust, moisture, or other contaminants.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43874647244890,"sku":"440R-C23139","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/440R-C231392.jpg?v=1787218232","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-440r-c23139-guardmaster-msr127tp-safety-relay","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}