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TERASAKI ESM-103B
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IWAKI ERC-6210
IWAKI ERC-6210
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Lenze ESMD113L4TXH509
Lenze ESMD113L4TXH509

TERASAKI ESM-103B

Product Name: Electronic Earth Leakage Relay / Motor Protection Relay
Product Introduction: The TERASAKI ESM-103B is an electronic-type residual current monitoring relay or control module designed for earth fault protection in marine and industrial power distribution systems, also applied for motor protection logic.
Category:
Description
Technical Specifications:
  • Rated Control Supply Voltage: 200-240V AC​ (50/60Hz)
  • Residual Operating Current (IΔn): 100mA / 300mA / 1A / 3A / 5A / 10A / 30A​ (Selectable)
  • Trip Delay Time: 0s / 0.5s / 1.0s / 2.0s​ (Selectable)
  • Output Contact: 1c/o​ (1NO + 1NC)
  • Contact Rating: 5A @ 250V AC​ (Resistive)
  • Auxiliary Power Consumption: Approx 3.5 VA
    Functional Characteristics: Multi-stage protection setting; self-diagnostic function; manual/auto reset; LED indicators for Power, Trip, Test.
    Performance Parameters:
  • Protection Class: IP20​ (Housing)
  • Operating Temperature: -20°C to +60°C​ (Industrial grade)
  • Storage Temperature: Wide range compliant
  • Humidity: Non-condensing industrial limits
    Material Composition: Robust resin molded case with anti-corrosion terminals.
    Structural Features: Panel mounting design; compact footprint saving control cabinet space; DIN rail compatible variants.
    Working Principle: Continuously monitors vector sum of phase currents; triggers output relay when imbalance exceeds preset residual current threshold.
    Advantages: Maritime-grade vibration and corrosion resistance; selective coordination capability preventing unnecessary outages; compatible with variable frequency drive environments.
    Applicable Industries: Marine and offshore vessels, power generation, food & beverage processing, industrial automation lines.
    Model Series: TERASAKI ESM Series.
    Installation Requirements: Secure panel mounting with proper torque on terminal screws; connect to matching zero-sequence current transformer (ZCT).
    Usage Precautions: Test functionality using built-in TEST button monthly; ensure selectivity settings match upstream/downstream devices; avoid installation in areas with excessive condensation without enclosure.
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