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The ABB OT400E03P is a compact, self-powered time-overcurrent relay from ABB's classic OT (Overcurrent Time) series. This is an electromechanical relay that provides fundamental and reliable phase overcurrent protection for electrical feeders, motors, and transformers. It is designed for simplicity, durability, and direct action, operating without an external auxiliary power supply.
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Parameters Category Parameter Specification for OT400E03P General Type Self-Powered, Electromechanical, Induction Disk/Cup, Time-Overcurrent Relay Protection Function Phase Overcurrent (ANSI 51) Auxiliary Power None Required (Self-powered from CT secondary) Current Input Rated Frequency 50 Hz or 60 Hz Continuous Thermal Current Typically 10 A (CT secondary) Burden (@ Setting) Approx. 1.0 to 2.5 VA (Varies with tap setting) Settings & Characteristics Current Pickup Range (Tap Setting) Typically 0.5 - 2.0 A or 2.0 - 8.0 A in steps (e.g., 0.5, 0.6, 0.8, 1.0, 1.2, 1.5, 2.0 A) Time Dial Setting Adjustable, typically 0.5 to 10 Time-Current Characteristic Standardized Curve: e.g., Normal Inverse (NI), Very Inverse (VI), or Extremely Inverse (EI). The "03" in the code defines this. Reset Characteristic Instantaneous or Definite Time (Depending on model) Output Contacts Contact Type SPDT (One NO, One NC) or DPDT Contact Rating Make & Carry: 30 A for 0.5s Continuous: 5 A Break (DC): 50 W (L/R=40ms) Mechanical Operation Indicator Mechanical "Target" Flag (Drops upon operation) Reset Mechanism Manual (Front push-button or lever) Case & Mounting Flush-mounted case (for "E" variant), for panel mounting. Accuracy Operating Time Accuracy ±10% of theoretical curve value (Typical for electromechanical) Environmental Operating Temperature -20°C to +55°C (Typical) Vibration & Shock Resistant to normal switchgear environment Standards Compliance IEC 60255, ANSI C37.90
