{"product_id":"k31e-abb-k-series-standard-control-relay-4-pole","title":"K31E ABB K-Series Standard Control Relay 4-Pole","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eK31E (K 31E)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eby ABB is a high-performance, industrial-grade standard control relay engineered for precision switching in AC control circuits. As a cornerstone of the legendary ABB K-Series, this 4-pole device features a specialized\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e3NO + 1NC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(3 Normally Open + 1 Normally Closed) contact configuration, making it indispensable for complex automation logic and motor control interlocking. Designed to withstand the rigorous demands of power plants, heavy manufacturing, and water treatment facilities, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eK31E\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eexcels in high-duty cycle environments. By integrating this relay into your control architecture, you ensure reliable signal isolation and auxiliary switching, significantly reducing unplanned downtime and enhancing system-wide operational safety.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\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\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eK31E\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eABB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBulgaria \/ Germany\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eContact Configuration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3 NO + 1 NC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eThermal Current (Ith)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 A\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRated Insulation Voltage (Ui)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e660 V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperational Voltage (AC-11)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e240 V \/ 415 V \/ 500 V \/ 660 V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperational Current (AC-11)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 A \/ 3 A \/ 2 A \/ 2 A\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eControl Circuit Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAC (Alternating Current)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTerminal Designations\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNO: 13-14, 33-34, 43-44; NC: 21-22\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSuppression\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eExternal RC-B 30\/220 RC-unit (220 V)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStandard Compliance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIEC 337-1, VDE 0660, UL, CSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.25 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-25 to +55 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the integrated RC-unit benefit the K31E relay lifespan?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe external Murrelektronik RC-B 30\/220 suppressor protects the relay coil by clamping inductive voltage peaks during de-energization. This prevents insulation breakdown and minimizes electromagnetic interference (EMI) in nearby sensitive PLC I\/O modules.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the K31E be used for DC load switching?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the K31E is optimized for AC-11 utilization categories (auxiliary electromagnetic loads), switching DC loads requires significant derating due to the lack of a natural zero-crossing for arc extinction. Contact our technical team for specific DC-13 ratings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the terminal requirements for secure wiring?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe device utilizes screw-clamp terminals. For high-vibration environments, we recommend using insulated crimp ferrules and maintaining a tightening torque of 1.0 to 1.2 Nm to prevent contact resistance buildup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the K31E compatible with modern ABB AF-Series accessories?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe K-Series is a legacy-standard architecture. While certain DIN-rail mounting components are universal, electrical accessories like auxiliary contact blocks should be verified for mechanical interlocking compatibility with the K-line frame.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSurge Suppression Alignment:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEnsure the RC-unit is mounted as close to the coil terminals (A1-A2) as possible. In 220 V control loops, the RC-B 30\/220 unit is critical for preventing \"back-EMF\" which can cause ghost-tripping in solid-state logic controllers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Management in Enclosures:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen mounting multiple K31E relays side-by-side, maintain a minimum lateral spacing of 5 mm if the ambient temperature exceeds 45 deg C. This prevents cumulative heat buildup from coil energization, ensuring the 10 A thermal current rating (Ith) remains valid.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSafety Interlocking Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1 NC contact (21-22) should be utilized for \"Fail-Safe\" feedback or electrical interlocking. In motor reversing applications, use this contact to physically break the coil circuit of the opposing contactor to prevent phase-to-phase shorts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":52701960077675,"sku":"K31E","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/k31e-3i1hjjo0foc_75a5f74a-a30e-44ac-b961-35cdde266d40.jpg?v=1766478204","url":"https:\/\/www.plcprotech.com\/products\/k31e-abb-k-series-standard-control-relay-4-pole","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}