{"product_id":"440r-n23120-allen-bradley-guardmaster-msr127tp-safety-relay","title":"440R-N23120 | Allen Bradley | Guardmaster MSR127TP Safety Relay","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen Bradley 440R-N23120\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(MSR127TP) serves as a critical safety monitoring hub for industrial machinery. This single-function safety relay processes signals from emergency stop buttons, safety gates, or PNP light curtains to ensure controlled machine shutdown. We supply this component as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoriginal factory stock, providing the high-integrity logic required to maintain Category 4 \/ PLe safety ratings in automated production environments.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 440R-N23120 integrates versatile input logic with high-capacity switching contacts for immediate power disconnection.\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\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAllen Bradley (Rockwell Automation)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel \/ Series\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMSR127TP (440R-N23120)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInput Supply\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24V AC\/DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSafety Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 N.C., 2 N.C., or 2 PNP Light Curtains\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSafety Outputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 N.O. (Normally Open)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eContact Rating\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e6 Amps at 24V DC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWithstand Voltage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2500V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInternal Resistance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e110 Ohms\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEnclosure Rating\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIP20 (Terminals), IP40 (Housing), NEMA 1\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\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.5 kg (3.3 lbs)\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\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMulti-Input Compatibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe MSR127TP monitors a wide array of safety devices. It accepts traditional dry contact inputs from E-stops and limit switches, while simultaneously supporting the OSSD outputs of PNP light curtains. This versatility allows engineers to standardize on a single relay model for various guarding applications.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Current Switching Capacity:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eMost safety logic modules only handle low-level signals. The 440R-N23120 features 6 Amp rated contacts, which allows the relay to drive larger contactors and actuators directly. This eliminates the need for interposing relays and simplifies the control cabinet architecture.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Dielectric Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eA 2500V withstand voltage rating ensures that internal logic remains protected against high-voltage transients and surges. This hardware hardening prevents premature relay failure in plants with heavy motor switching and poor power quality.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStreamlined Troubleshooting:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe compact IP40 enclosure includes clear status indicators for input and output states. Technicians can identify faulted safety strings at a glance, which drastically reduces Mean Time to Repair (MTTR) during machine downtime.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use the 440R-N23120 with both AC and DC control power?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The universal coil design accepts 24V AC or 24V DC. This allows the relay to function across various control transformer outputs or regulated DC power supplies without requiring separate hardware versions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the \"TP\" and \"TS\" versions of the MSR127?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \"TP\" version (MSR127TP) features removable terminals, which facilitates faster replacement and prevents wiring errors. The internal safety logic remains identical, but the TP hardware significantly optimizes maintenance workflows.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I configure the relay for light curtain monitoring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe MSR127TP includes dedicated input circuitry for OSSD (Output Signal Switching Device) signals. You connect the two PNP outputs from the light curtain directly to the relay inputs; the internal logic then monitors for pulse synchronization and short-circuits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this relay support automatic or manual reset?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 440R-N23120 supports both monitored manual reset and automatic\/manual reset modes depending on the wiring configuration of the S33-S34 terminals. Use the monitored manual reset for high-risk applications to prevent unexpected machine restarts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52788498432309,"sku":"440R-N23120","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/440R-N231202.png?v=1777275389","url":"https:\/\/www.5gplc.com\/products\/440r-n23120-allen-bradley-guardmaster-msr127tp-safety-relay","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}