{"product_id":"st570s-motor-protection-controller","title":"ST570S Motor Protection Controller","description":"\u003ch2\u003eST570S Motor Protection Controller\u003c\/h2\u003e\u003cp\u003eThe ST570S Motor Protection Controller is an advanced all-in-one device designed for low-voltage motors operating at rated frequencies of 50\/60Hz and voltages up to AC660V\/AC690V. Integrating protection, measurement, control, management, and communication functions, it works seamlessly with contactors, soft starters, variable frequency drives (VFDs), and circuit breakers to deliver comprehensive motor control solutions — making it the ideal terminal unit for intelligent MCC or DCS systems.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eModular design: base module + dedicated current transformer + display module + expansion modules\u003c\/li\u003e\n\u003cli\u003eCompact structure, small footprint — fits directly into 1\/4 modular and larger drawer cabinets\u003c\/li\u003e\n\u003cli\u003eMultiple motor starting control schemes\u003c\/li\u003e\n\u003cli\u003eSuitable for explosive environments (increased safety type \"e\" per GB\/T 3836.3-2021)\u003c\/li\u003e\n\u003cli\u003eWide industry application: power generation, oil \u0026amp; gas, petrochemical, metallurgy, coal, paper, rail transit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompliance Standards\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGB\/T 14048.4 — Low-voltage switchgear and controlgear\u003c\/li\u003e\n\u003cli\u003eGB\/T 14598.303 — Digital motor comprehensive protection general technical requirements\u003c\/li\u003e\n\u003cli\u003eGB\/T 3836.3-2021 — Explosive atmospheres, increased safety type \"e\"\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ch4\u003eEnvironmental Conditions\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOperating Temperature: -10°C to +55°C\u003c\/li\u003e\n\u003cli\u003eStorage Temperature: -25°C to +70°C\u003c\/li\u003e\n\u003cli\u003eRelative Humidity: 5%–95% (no condensation or icing)\u003c\/li\u003e\n\u003cli\u003eAtmospheric Pressure: 80–110 kPa\u003c\/li\u003e\n\u003cli\u003eAltitude: \u0026lt;3,000 m\u003c\/li\u003e\n\u003cli\u003ePollution Degree: Class 3\u003c\/li\u003e\n\u003cli\u003eBody Protection: IP20 | Panel Protection: IP54\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eAuxiliary Power Supply\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eVoltage Range: 85–264VAC\/50Hz; 110VDC \/ 220VDC\u003c\/li\u003e\n\u003cli\u003ePower Consumption: \u0026lt;5W \/ 10VA\u003c\/li\u003e\n\u003cli\u003eSurge Current: \u0026lt;20A\u003c\/li\u003e\n\u003cli\u003ePower Interruption Tolerance: ≥500ms\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCurrent Circuit\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRated Parameters: 1A (0.2–1A), 5A (0.5–5A), 25A (2.5–25A), 100A (10–100A), 160A (16–160A), 400A (40–400A)\u003c\/li\u003e\n\u003cli\u003eExternal CT options for motors \u0026gt;400A: 500A (150–500A), 820A (250–820A)\u003c\/li\u003e\n\u003cli\u003eOverload Capacity: 2× rated current continuous; 10× rated current for 10s; 40× rated current for 1s\u003c\/li\u003e\n\u003cli\u003eRated Frequency: 50\/60Hz\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eVoltage Circuit\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRated Parameters: 380V, 660V\u003c\/li\u003e\n\u003cli\u003eOverload Capacity: 1.2× rated voltage continuous; 1.4× rated voltage for 10s\u003c\/li\u003e\n\u003cli\u003ePower Consumption: \u0026lt;1VA\/phase\u003c\/li\u003e\n\u003cli\u003eRated Frequency: 50\/60Hz\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProtection Functions\u003c\/h3\u003e\u003ch4\u003eThermal Overload Protection\u003c\/h4\u003e\u003cp\u003ePrevents motor damage caused by overload-induced overheating. The protection activates after motor start, using the ratio of equivalent current to rated current as the trigger criterion. The thermal model accounts for both positive and negative sequence current heating effects, following inverse-time characteristics. Two reset modes are available:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto Reset:\u003c\/strong\u003e Automatically clears the fault once thermal capacity drops below the reset threshold — no manual intervention required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual Reset:\u003c\/strong\u003e Requires manual operator reset after thermal capacity drops below the reset threshold before the motor can restart.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Wanlong Electric","offers":[{"title":"Default Title","offer_id":44272557981762,"sku":null,"price":280.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/ST570S_EIO-3.webp?v=1784514654","url":"https:\/\/wanlongelectric.com\/products\/st570s-motor-protection-controller","provider":"Wan Long Electric Group Co., Ltd.","version":"1.0","type":"link"}