{"product_id":"st570s-eio-e2dp-ehd-2-motor-protection-controller-power-dip-retention","title":"ST570S+EIO+E2DP+EHD-2 Motor Protection Controller with Power Dip Retention Module","description":"\u003ch2\u003eST570S+EIO+E2DP+EHD-2 Motor Protection Controller with Power Dip Retention Module\u003c\/h2\u003e\u003cp\u003eThe ST570S+EIO+E2DP+EHD-2 is a fully integrated motor protection controller system combining the ST570S base unit with expansion I\/O module (EIO), dual-power expansion module (E2DP), and power dip retention module (EHD-2). Designed for low-voltage motors at rated frequencies of 50\/60Hz and voltages up to AC660V\/AC690V, this modular system delivers comprehensive protection, measurement, control, management, and communication — the ideal terminal unit for intelligent MCC or DCS systems.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eComplete modular system: base module + EIO expansion + E2DP dual-power module + EHD-2 power dip retention module\u003c\/li\u003e\n\u003cli\u003ePower dip retention capability — maintains motor operation during momentary voltage dips\u003c\/li\u003e\n\u003cli\u003eCompact structure, fits directly into 1\/4 modular and larger drawer cabinets\u003c\/li\u003e\n\u003cli\u003eCompatible with contactors, soft starters, VFDs, and circuit breakers\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 from overload-induced overheating. Accounts for both positive and negative sequence current heating effects using inverse-time characteristics. Two reset modes available: Auto Reset (clears fault automatically once thermal capacity drops below threshold) and Manual Reset (requires operator intervention before motor restart).\u003c\/p\u003e\u003ch4\u003eBlocking (Stall) Protection\u003c\/h4\u003e\u003cp\u003eProtects against sudden current surge caused by rotor stall during operation. Activates after motor start using maximum phase current vs. rated current ratio; executes in definite-time mode.\u003c\/p\u003e\u003ch4\u003etE Time Protection\u003c\/h4\u003e\u003cp\u003eCompliant with GB\/T 3836.3 for increased-safety explosion-proof motors. Monitors the time from locked-rotor current onset to temperature limit — trip setpoint tETrip must satisfy tETrip ≤ tE.\u003c\/p\u003e\u003ch4\u003eStart Overtime Protection\u003c\/h4\u003e\u003cp\u003ePrevents insulation damage from prolonged starting. Triggers if current exceeds the set value after the configured start time has elapsed; automatically disengages once the motor enters normal running state.\u003c\/p\u003e\u003ch4\u003eSingle-Phase Earth Fault Protection\u003c\/h4\u003e\u003cp\u003eCalculates earth fault current from the vector sum of three-phase currents — no additional earth CT required. Effective in low-voltage TN distribution systems. Trip target selectable: contactor or circuit breaker.\u003c\/p\u003e\u003ch4\u003eResidual Current Protection\u003c\/h4\u003e\u003cp\u003eRequires external zero-sequence CT. Detects insulation degradation or indirect earth faults. Configurable start-up blocking time; trip target selectable: contactor or circuit breaker.\u003c\/p\u003e\u003ch4\u003eCurrent Phase Loss Protection\u003c\/h4\u003e\u003cp\u003eMonitors three-phase current imbalance after motor start. Triggers when maximum imbalance exceeds 80%.\u003c\/p\u003e\u003ch4\u003eCurrent Imbalance \u0026amp; Reverse Phase Sequence Protection\u003c\/h4\u003e\u003cp\u003eTriggers when current imbalance exceeds the set value (with average current \u0026gt;25%). Reverse phase sequence detected within 200ms after motor start.\u003c\/p\u003e\u003ch4\u003eUnderload Protection\u003c\/h4\u003e\u003cp\u003eDetects abnormal low-load conditions (e.g., pump cavitation, broken conveyor belt). Monitors current or power; triggers in definite-time mode when below set threshold.\u003c\/p\u003e\u003ch4\u003eUndervoltage Protection\u003c\/h4\u003e\u003cp\u003eTriggers when maximum line voltage drops below set value. Includes undervoltage ready function for standby state monitoring.\u003c\/p\u003e\u003ch4\u003eOvervoltage Protection\u003c\/h4\u003e\u003cp\u003eTriggers when maximum line voltage exceeds set value to protect motor insulation from high-voltage operation.\u003c\/p\u003e\u003ch4\u003eVoltage Imbalance \u0026amp; Reverse Phase Sequence Protection\u003c\/h4\u003e\u003cp\u003eMonitors three-phase voltage imbalance after motor start (effective when average voltage \u0026gt;25%). Reverse phase sequence detected within 200ms.\u003c\/p\u003e\u003ch4\u003eExternal Fault Protection\u003c\/h4\u003e\u003cp\u003eAccepts external digital input signals for fast protection, process interlock, or circuit breaker trip alarm functions. Configurable for trip or alarm output.\u003c\/p\u003e\u003ch4\u003eContactor Fault Protection\u003c\/h4\u003e\u003cp\u003eIf motor remains energized 500ms after a protection trip, the system escalates to circuit breaker trip.\u003c\/p\u003e\u003ch4\u003eOverflow Protection\u003c\/h4\u003e\u003cp\u003eWhen fault current exceeds the contactor's rated breaking capacity, the system bypasses the contactor and directly trips the circuit breaker, followed by contactor trip after 200ms.\u003c\/p\u003e\u003ch4\u003ePT Wire Break Alarm\u003c\/h4\u003e\u003cp\u003eActivates when any phase current exceeds 25% of rated value and positive-sequence voltage drops below or negative-sequence voltage rises above the PT wire break threshold.\u003c\/p\u003e","brand":"Wanlong Electric","offers":[{"title":"Default Title","offer_id":44272615784514,"sku":null,"price":580.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0688\/1221\/0242\/files\/ST570S_EIO_E2DP_EHD-2.webp?v=1784516959","url":"https:\/\/wanlongelectric.com\/products\/st570s-eio-e2dp-ehd-2-motor-protection-controller-power-dip-retention","provider":"Wan Long Electric Group Co., Ltd.","version":"1.0","type":"link"}