{"product_id":"honeywell-51120841-101-spdt-control-relay-module","title":"Honeywell 51120841-101 SPDT Control Relay Module","description":"\u003ch2\u003eHoneywell 51120841-101 SPDT Control Relay Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell 51120841-101\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eMR Series\u003c\/strong\u003e SPDT relay module, operates as a single-pole, double-throw control relay for discrete signal switching in Honeywell system architectures.\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\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e51120841-101\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eMR Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.2 kg (0.44 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e13.5 cm × 7.1 cm × 2 cm (5.3 in × 2.8 in × 0.8 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Temp\u003c\/th\u003e\n\u003ctd\u003e-40 deg C to +70 deg C (-40 F to +158 F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage Temp\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRelative Humidity\u003c\/th\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower Consumption\u003c\/th\u003e\n\u003ctd\u003e~15 mA per position (coil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eModule Type\u003c\/th\u003e\n\u003ctd\u003eSPDT Control Relay Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContact Configuration\u003c\/th\u003e\n\u003ctd\u003eSPDT, 1 Form C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eControl Voltage\u003c\/th\u003e\n\u003ctd\u003e24 VDC, 24 VAC, 115 VAC, 230 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOperating Range\u003c\/th\u003e\n\u003ctd\u003e18 to 30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContact Rating\u003c\/th\u003e\n\u003ctd\u003e10 A at 250 VAC \/ 10 A at 30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStatus Indicator\u003c\/th\u003e\n\u003ctd\u003eBuilt-in red LED (coil energized)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMounting Options\u003c\/th\u003e\n\u003ctd\u003eTrack-mounting \/ DIN rail or panel mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCertifications\u003c\/th\u003e\n\u003ctd\u003eCE, TUV, UL508, CSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eGalvanic Isolation and Fail-Safe Execution\u003c\/h3\u003e\n\u003cp\u003eThe 51120841-101 relay module provides galvanic isolation between coil control voltage and switched contacts, ensuring safe separation of logic and field circuits. In fail-safe configurations, the SPDT contact arrangement supports deterministic switching to default states, maintaining system integrity under fault conditions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: What is the maximum current rating of the relay contacts? A: The contacts are rated at 10 A for 250 VAC and 10 A for 30 VDC.\u003c\/p\u003e\n\u003cp\u003eQ: Does the module include a status indicator? A: Yes. A built-in red LED illuminates when the coil is energized.\u003c\/p\u003e\n\u003cp\u003eQ: What mounting options are supported? A: The module supports DIN rail, track-mounting, or panel installation.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the relay module securely on DIN rail or panel tracks with proper mechanical engagement.\u003c\/li\u003e\n\u003cli\u003eEnsure coil voltage wiring matches the specified operating range (18–30 VDC or AC variants).\u003c\/li\u003e\n\u003cli\u003eUse shielded wiring for control circuits, grounding shields at the system end only.\u003c\/li\u003e\n\u003cli\u003eSeparate relay wiring from high-current conductors to minimize interference.\u003c\/li\u003e\n\u003cli\u003eVerify contact polarity and load ratings before energizing.\u003c\/li\u003e\n\u003cli\u003eMaintain ambient conditions within specified operating temperature limits.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":44571477475427,"sku":"51120841-101","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/2775\/3315\/files\/51305508-100_1.png?v=1788779966","url":"https:\/\/precisemodule.com\/products\/honeywell-51120841-101-spdt-control-relay-module","provider":"Precise Module Ltd.","version":"1.0","type":"link"}