{"product_id":"1pce-111nu-d024-1-84-general-purpose-relay-3a-24vdc-4pins","title":"1Pce 111NU-D024-1-84 General Purpose Relay 3A 24VDC 4Pins","description":"\u003cdiv class=\"koeed-container\" style=\"width:100%;color:#222;line-height:1.7;\"\u003e\r\n\r\n  \u003cstyle\u003e\n    .koeed-container h2,\n    .koeed-container h3{\n      color:#16c8c8;\n      margin-top:32px;\n      border-bottom:1px solid #eaeaea;\n      padding-bottom:8px;\n    }\n\n    .koeed-container table{\n      width:100%;\n      border-collapse:collapse;\n      margin:18px 0;\n    }\n\n    .koeed-container th,\n    .koeed-container td{\n      border:1px solid #eeeeee;\n      padding:10px;\n      text-align:left;\n      vertical-align:top;\n    }\n\n    .koeed-container tr:nth-child(odd){\n      background:#f4fcfc;\n    }\n\n    .koeed-container tr:nth-child(even){\n      background:#fafafa;\n    }\n\n    .koeed-note{\n      background:#f4fcfc;\n      border-left:4px solid #16c8c8;\n      padding:14px;\n      margin:18px 0;\n    }\n\n    .koeed-list li{\n      margin-bottom:10px;\n    }\n  \u003c\/style\u003e\r\n\r\n  \u003ch2\u003eEngineer's Quick Brief\u003c\/h2\u003e\r\n\r\n  \u003cul class=\"koeed-list\"\u003e\r\n\r\n    \u003cli\u003e\r\n      \u003cstrong\u003e111NU-D024-1-84\u003c\/strong\u003e is a \u003cstrong\u003egeneral purpose electromagnetic relay\u003c\/strong\u003e designed for low-power switching, industrial control logic, and PCB-based electrical control applications.\r\n    \u003c\/li\u003e\r\n\r\n    \u003cli\u003e\r\n      The relay operates with a \u003cstrong\u003e24VDC coil voltage\u003c\/strong\u003e and supports signal or low-current load switching up to \u003cstrong\u003e3A\u003c\/strong\u003e.\r\n    \u003c\/li\u003e\r\n\r\n    \u003cli\u003e\r\n      Typical applications include industrial controllers, automation boards, HVAC systems, instrumentation interfaces, and embedded control circuits.\r\n    \u003c\/li\u003e\r\n\r\n  \u003c\/ul\u003e\r\n\r\n  \u003cdiv class=\"koeed-note\"\u003e\r\n    Relay replacement requires verification of coil voltage, contact arrangement, switching current, PCB footprint, terminal spacing, and insulation requirements before installation.\r\n  \u003c\/div\u003e\r\n\r\n  \u003ch2\u003eSEO Introduction\u003c\/h2\u003e\r\n\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003e111NU-D024-1-84 General Purpose Relay\u003c\/strong\u003e is a \r\n    \u003cstrong\u003e24VDC electromagnetic relay\u003c\/strong\u003e used for electrical isolation, signal switching, and low-current control operations in industrial and electronic systems.\r\n  \u003c\/p\u003e\r\n\r\n  \u003cp\u003e\r\n    Common search intents associated with this relay include:\r\n    \u003cstrong\u003e111NU-D024-1-84 relay replacement\u003c\/strong\u003e,\r\n    \u003cstrong\u003e24VDC general purpose relay\u003c\/strong\u003e,\r\n    \u003cstrong\u003e4 pin PCB relay\u003c\/strong\u003e,\r\n    \u003cstrong\u003e3A switching relay\u003c\/strong\u003e,\r\n    and \u003cstrong\u003eindustrial control relay\u003c\/strong\u003e.\r\n  \u003c\/p\u003e\r\n\r\n  \u003cp\u003e\r\n    General purpose relays are widely integrated into automation equipment, control panels, interface modules, embedded electronics, and electrical protection systems where reliable switching performance is required.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\r\n\r\n  \u003cdiv style=\"overflow-x:auto;\"\u003e\r\n\r\n    \u003ctable\u003e\r\n\r\n      \u003cthead\u003e\r\n        \u003ctr\u003e\r\n          \u003cth\u003eParameter\u003c\/th\u003e\r\n          \u003cth\u003eSpecification\u003c\/th\u003e\r\n        \u003c\/tr\u003e\r\n      \u003c\/thead\u003e\r\n\r\n      \u003ctbody\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eModel Number\u003c\/td\u003e\r\n          \u003ctd\u003e\u003cstrong\u003e111NU-D024-1-84\u003c\/strong\u003e\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eProduct Type\u003c\/td\u003e\r\n          \u003ctd\u003eGeneral purpose electromagnetic relay\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eCoil Voltage\u003c\/td\u003e\r\n          \u003ctd\u003e24VDC\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eRated Switching Current\u003c\/td\u003e\r\n          \u003ctd\u003e3A\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003ePin Count\u003c\/td\u003e\r\n          \u003ctd\u003e4 pins\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eMounting Method\u003c\/td\u003e\r\n          \u003ctd\u003ePCB mounting\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eRelay Technology\u003c\/td\u003e\r\n          \u003ctd\u003eElectromechanical relay\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eControl Signal Type\u003c\/td\u003e\r\n          \u003ctd\u003eDC coil activation\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003ePrimary Function\u003c\/td\u003e\r\n          \u003ctd\u003eElectrical isolation and load switching\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eContact Structure\u003c\/td\u003e\r\n          \u003ctd\u003eDependent on relay configuration revision\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eLoad Category\u003c\/td\u003e\r\n          \u003ctd\u003eSignal and low-power electrical loads\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eTypical Applications\u003c\/td\u003e\r\n          \u003ctd\u003eAutomation systems, HVAC controls, instrumentation circuits\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eContact Material\u003c\/td\u003e\r\n          \u003ctd\u003eSilver alloy contact system\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eInsulation Method\u003c\/td\u003e\r\n          \u003ctd\u003eCoil-to-contact galvanic isolation\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eTypical Switching Mode\u003c\/td\u003e\r\n          \u003ctd\u003eElectromagnetic mechanical contact switching\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eEnvironmental Usage\u003c\/td\u003e\r\n          \u003ctd\u003eIndustrial electronics and embedded control systems\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eTypical Failure Modes\u003c\/td\u003e\r\n          \u003ctd\u003e\r\n            Contact wear, coil burnout, oxidation,\r\n            switching arc damage, mechanical sticking\r\n          \u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n      \u003c\/tbody\u003e\r\n\r\n    \u003c\/table\u003e\r\n\r\n  \u003c\/div\u003e\r\n\r\n  \u003ch2\u003eApplication Matrix\u003c\/h2\u003e\r\n\r\n  \u003cdiv style=\"overflow-x:auto;\"\u003e\r\n\r\n    \u003ctable\u003e\r\n\r\n      \u003cthead\u003e\r\n        \u003ctr\u003e\r\n          \u003cth\u003eApplication Scenario\u003c\/th\u003e\r\n          \u003cth\u003eEngineering Value\u003c\/th\u003e\r\n        \u003c\/tr\u003e\r\n      \u003c\/thead\u003e\r\n\r\n      \u003ctbody\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eIndustrial Automation Boards\u003c\/td\u003e\r\n          \u003ctd\u003eProvides isolated switching control for PLC and automation outputs.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eHVAC Control Systems\u003c\/td\u003e\r\n          \u003ctd\u003eSupports low-current actuator and signal switching operations.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eInstrumentation Interfaces\u003c\/td\u003e\r\n          \u003ctd\u003eEnables electrical separation between control logic and field devices.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eEmbedded Electronic Equipment\u003c\/td\u003e\r\n          \u003ctd\u003eProvides reliable relay-based control inside compact electronic assemblies.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eElectrical Control Panels\u003c\/td\u003e\r\n          \u003ctd\u003eUsed for signal routing and relay isolation functions.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n      \u003c\/tbody\u003e\r\n\r\n    \u003c\/table\u003e\r\n\r\n  \u003c\/div\u003e\r\n\r\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\r\n\r\n  \u003ch3\u003eWhy does the relay click but the load does not operate?\u003c\/h3\u003e\r\n\r\n  \u003cp\u003e\r\n    The relay coil may activate normally while the contacts are damaged, oxidized, overloaded, or incorrectly wired to the external circuit.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eCan a different 24V relay replace 111NU-D024-1-84?\u003c\/h3\u003e\r\n\r\n  \u003cp\u003e\r\n    Replacement requires matching coil voltage, contact arrangement, pin layout, current rating, insulation spacing, and PCB footprint compatibility.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat causes relay contact sticking?\u003c\/h3\u003e\r\n\r\n  \u003cp\u003e\r\n    Excessive inrush current, switching inductive loads without suppression, contact welding, and long-term electrical arcing may cause contact sticking.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy is relay coil polarity important in some circuits?\u003c\/h3\u003e\r\n\r\n  \u003cp\u003e\r\n    Some relay designs integrate internal suppression diodes or polarity-sensitive protection components that require correct DC polarity connection.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat should be checked before relay replacement?\u003c\/h3\u003e\r\n\r\n  \u003cul class=\"koeed-list\"\u003e\r\n    \u003cli\u003eCoil voltage rating\u003c\/li\u003e\r\n    \u003cli\u003ePCB pin spacing\u003c\/li\u003e\r\n    \u003cli\u003eContact configuration\u003c\/li\u003e\r\n    \u003cli\u003eLoad current requirement\u003c\/li\u003e\r\n    \u003cli\u003eIsolation specification\u003c\/li\u003e\r\n    \u003cli\u003eSwitching load category\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003eCross-Reference \u0026amp; Selection\u003c\/h2\u003e\r\n\r\n  \u003ch3\u003eCross-Reference Guide\u003c\/h3\u003e\r\n\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003e111NU-D024-1-84\u003c\/strong\u003e belongs to the category of \r\n    \u003cstrong\u003egeneral purpose PCB-mounted relays\u003c\/strong\u003e used for low-current industrial and embedded control applications.\r\n  \u003c\/p\u003e\r\n\r\n  \u003cdiv style=\"overflow-x:auto;\"\u003e\r\n\r\n    \u003ctable\u003e\r\n\r\n      \u003cthead\u003e\r\n        \u003ctr\u003e\r\n          \u003cth\u003eReference Category\u003c\/th\u003e\r\n          \u003cth\u003eDescription\u003c\/th\u003e\r\n        \u003c\/tr\u003e\r\n      \u003c\/thead\u003e\r\n\r\n      \u003ctbody\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003e24VDC Control Relay\u003c\/td\u003e\r\n          \u003ctd\u003eElectromagnetic relay for industrial DC control systems.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003ePCB Power Relay\u003c\/td\u003e\r\n          \u003ctd\u003eBoard-mounted switching relay for low-power load control.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eSignal Isolation Relay\u003c\/td\u003e\r\n          \u003ctd\u003eElectrical separation relay for automation interfaces.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n        \u003ctr\u003e\r\n          \u003ctd\u003eIndustrial Interface Relay\u003c\/td\u003e\r\n          \u003ctd\u003eControl relay used in instrumentation and electronic systems.\u003c\/td\u003e\r\n        \u003c\/tr\u003e\r\n\r\n      \u003c\/tbody\u003e\r\n\r\n    \u003c\/table\u003e\r\n\r\n  \u003c\/div\u003e\r\n\r\n  \u003cdiv class=\"koeed-note\"\u003e\r\n    Engineers should verify coil specifications, switching load characteristics, and PCB mechanical compatibility before replacing any industrial control relay.\r\n  \u003c\/div\u003e\r\n\r\n  \u003cscript type=\"application\/ld+json\"\u003e\r\n  {\r\n    \"@context\":\"https:\/\/schema.org\",\r\n    \"@type\":\"FAQPage\",\r\n    \"mainEntity\":[\r\n      {\r\n        \"@type\":\"Question\",\r\n        \"name\":\"Why does the relay click but the load does not operate?\",\r\n        \"acceptedAnswer\":{\r\n          \"@type\":\"Answer\",\r\n          \"text\":\"The relay coil may energize correctly while damaged, oxidized, overloaded, or incorrectly wired contacts prevent load switching.\"\r\n        }\r\n      },\r\n      {\r\n        \"@type\":\"Question\",\r\n        \"name\":\"Can a different 24V relay replace 111NU-D024-1-84?\",\r\n        \"acceptedAnswer\":{\r\n          \"@type\":\"Answer\",\r\n          \"text\":\"Replacement compatibility depends on coil voltage, contact arrangement, PCB footprint, current rating, and insulation specifications.\"\r\n        }\r\n      },\r\n      {\r\n        \"@type\":\"Question\",\r\n        \"name\":\"What causes relay contact sticking?\",\r\n        \"acceptedAnswer\":{\r\n          \"@type\":\"Answer\",\r\n          \"text\":\"Contact sticking may result from high inrush current, electrical arcing, overload conditions, or inductive switching without suppression circuitry.\"\r\n        }\r\n      },\r\n      {\r\n        \"@type\":\"Question\",\r\n        \"name\":\"Why is relay coil polarity important in some circuits?\",\r\n        \"acceptedAnswer\":{\r\n          \"@type\":\"Answer\",\r\n          \"text\":\"Some relay assemblies include internal suppression diodes or protection circuits that require correct DC polarity connection.\"\r\n        }\r\n      }\r\n    ]\r\n  }\r\n  \u003c\/script\u003e\r\n\r\n\u003c\/div\u003e","brand":"KOEED","offers":[{"title":"Default Title","offer_id":46379899388089,"sku":"287120646500","price":21.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/1_560e10f7-4a14-43c5-87ae-1c086d64f698.webp?v=1775027081","url":"https:\/\/koeed.com\/id\/products\/1pce-111nu-d024-1-84-general-purpose-relay-3a-24vdc-4pins","provider":"KOEED","version":"1.0","type":"link"}