{"product_id":"motor-protection-relay-device","title":"Motor Protection Relay \/ Device | Intelligent Motor Protection","description":"\u003ch1\u003eMotor Protection Relay \/ Device — Suzhou Manufacturer\u003c\/h1\u003e\u003cp\u003eWan Long Electric’s \u003cstrong\u003eIntelligent Motor Protection Relay\u003c\/strong\u003e provides comprehensive protection for AC induction motors against overload, phase failure, phase unbalance, locked rotor, thermistor overtemperature, and ground fault. Designed for industrial motor control centers (MCC) and standalone motor starters, it maximizes motor uptime and extends motor life.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Protection Functions:\u003c\/strong\u003e Overload, phase loss, phase reversal, phase unbalance, locked rotor, stall, thermistor (PTC\/NTC), ground fault, undercurrent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Current Setting Range:\u003c\/strong\u003e 0.1A to 630A (via built-in CT or external CT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntelligent Self-Learning:\u003c\/strong\u003e Automatic motor parameter learning for optimized protection thresholds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLCD Display:\u003c\/strong\u003e Real-time motor current, voltage, power, temperature, and fault history\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommunication Interface:\u003c\/strong\u003e RS485 \/ Modbus RTU for MCC and SCADA integration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrip Class:\u003c\/strong\u003e Class 5, 10, 20, 30 selectable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Relays:\u003c\/strong\u003e Trip relay, alarm relay, and ready relay outputs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSupply Voltage: 85–265V AC\/DC (universal) or 24V DC\u003c\/li\u003e\n\u003cli\u003eCurrent Setting Range: 0.1A – 630A\u003c\/li\u003e\n\u003cli\u003eTrip Class: Class 5 \/ 10 \/ 20 \/ 30 (IEC 60947-4-1)\u003c\/li\u003e\n\u003cli\u003ePhase Unbalance Detection: ≥5% unbalance triggers alarm; ≥15% triggers trip\u003c\/li\u003e\n\u003cli\u003eResponse Time (Phase Loss): \u0026lt;500ms\u003c\/li\u003e\n\u003cli\u003eThermistor Input: PTC \/ NTC compatible\u003c\/li\u003e\n\u003cli\u003eStandards: IEC 60947-4-1, IEC 60255, GB 14048.4\u003c\/li\u003e\n\u003cli\u003eMounting: DIN rail or panel mount\u003c\/li\u003e\n\u003cli\u003eProtection Degree: IP40 (front face)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMotor Control Centers (MCC) in industrial plants\u003c\/li\u003e\n\u003cli\u003ePump and compressor motor protection\u003c\/li\u003e\n\u003cli\u003eFan, blower, and HVAC motor protection\u003c\/li\u003e\n\u003cli\u003eConveyor and crane motor protection\u003c\/li\u003e\n\u003cli\u003eWater and wastewater treatment plant motors\u003c\/li\u003e\n\u003cli\u003eMining and heavy industry motor applications\u003c\/li\u003e\n\u003cli\u003eOil \u0026amp; gas processing equipment motors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy Choose Wan Long Electric?\u003c\/h2\u003e\u003cp\u003eOur motor protection relays are engineered for reliability in the harshest industrial environments. Manufactured in Suzhou with full IEC 60947-4-1 compliance, they offer superior protection accuracy and easy integration into existing motor control systems via Modbus RTU. We provide OEM\/ODM services, custom current ranges, and full technical documentation in English.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eContact our team for application support and a competitive quotation.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Wan Long Electric","offers":[{"title":"Default Title","offer_id":43882462478402,"sku":null,"price":0.0,"currency_code":"CNY","in_stock":true}],"url":"https:\/\/wanlongelectric.com\/products\/motor-protection-relay-device","provider":"Wan Long Electric Group Co., Ltd.","version":"1.0","type":"link"}