Key Specifications Parameter Value Brand Schneider Electric / nVent (formerly Samwha EOCR) Series EOCR-3EZ Product Type Multifunctional Electronic Motor Protection Relay Model / Reference EOCR3EZ-WRAF7AQ CT Type Window (Through-hole) type for easy installation without disconnecting power leads Current Measurement Integrated window-type CTs Current Setting Range • Direct measurement: 0.5-60A (with integrated CTs) • With external CTs: Up to 960A (using CT with 5A secondary) Control Voltage F7: 100-240VAC/DC (wide range) Frequency 50/60 Hz (power circuit) Suitable for variable frequency drive applications (20-400Hz) Protection Functions • Overcurrent (Overload) • Undercurrent (Underload) • Phase Loss / Open Phase • Phase Reversal (Reverse Phase) • Phase Unbalance / Imbalance • Locked Rotor (Stall) at Start and Run • Earth Fault (Ground Fault) • Jamming • Mechanical jam • Short circuit protection Measurement Accuracy ±1% (high precision) Time Delay Settings • Start Delay (D-TIME): 0-200 seconds • Trip Delay (O-TIME): 0.2-120 seconds (definite) or 1-30 Class (inverse/thermal) • Undercurrent Trip Delay (U-TIME): 0.5-120 seconds • Earth Fault Trip Delay (E-TIME): 0.1-10 seconds Output Contact Configuration R-type: "Non-Fail-Safe" operation (contacts do not change state when relay is powered on/energized) Output Contacts Multiple independent relay outputs (typically 3) for trip and alarm functions Contact Rating: 3A / 250VAC resistive Reset Mode Manual (Instant) / Electric (Remote) / Auto selectable Communication Modbus RTU protocol, RS-485 interface Display / Indication • Digital display (7-segment LED) for real-time current values • Fault cause indication with detailed information • LED indicators for operational status • Current amplitude bar graph Monitoring Functions • Real-time 3-phase current display • Cyclic display of currents • Fault recording with cause storage (last 3 faults) • Operating time accumulation • Self-diagnosis function • Motor running time display • Number of starts counter Mounting 35mm DIN Rail / Panel mount Special Features • High accuracy measurement (±1%) • Records last 3 faults with detailed information (cause, current values) • Separate display unit option available (up to 150m distance) • PC parameter setting capability via dedicated software • Restart limit function (0-10 times) • Date and time setting • Phase/Neutral load protection selectable • 4-20mA analog output option Standards IEC 60947-4-1, UL, CSA, CCC Rated Operational Voltage (Ue) Up to 690V AC (dependent on external CT rating) Rated Insulation Voltage (Ui) 600V AC (UL/CSA) / 690V AC (IEC) Rated Impulse Withstand Voltage (Uimp) 6 kV Degree of Protection IP20 (relay body) / Front panel sealed Operating Temperature -20°C to 60°C Storage Temperature -30°C to 80°C Power Consumption Ultra-low consumption (typically <3W) Dimensions (W x H x D) Compact design for 35mm DIN rail mounting (approx. 45 x 95 x 115 mm) Weight Approximately 0.3 - 0.35 kg