Key Specifications Parameter Value Brand Schneider Electric / nVent (formerly Samwha EOCR) Series EOCR-3MZ2 Product Type Multifunctional Electronic Motor Protection Relay Model / Reference 3MZ2-WRDUH CT Type Window (Through-hole) type for easy installation without disconnecting power leads Current Measurement Integrated window-type CTs Current Setting Range Wide range (typically 0.5-80A with compatible CTs, up to 800A with higher-rated external CTs) Control Voltage U: 100-240VAC/DC (wide range) Frequency 50/60 Hz (power circuit) Suitable for variable frequency drive applications 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) Time Delay Settings • Start Delay (D-TIME) • Trip Delay (O-TIME) • Undercurrent Trip Delay (U-TIME) • Earth Fault Trip Delay (E-TIME) Output Contact Configuration R-type: Contacts do not change state when relay is powered on (energized) Output Contacts Multiple independent relay outputs (typically 2-3) for trip and alarm functions Reset Mode Manual (Instant) / Electric (Remote) / Auto selectable Communication Modbus RTU protocol, RS-485 interface (typical for 3MZ2 series) Display / Indication Digital display (7-segment LED) for real-time current values and fault cause indication LED indicators for operational status Monitoring Functions • Real-time 3-phase current display • Fault recording with cause storage • Operating time accumulation • Self-diagnosis function Mounting 35mm DIN Rail / Panel mount Special Features • Records last 3 faults (cause, current values) • Separate display option available • PC parameter setting capability Standards IEC 60947-4-1, UL, CSA Rated Operational Voltage (Ue) Up to 690V AC (dependent on 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 90 x 110 mm) Weight Approximately 0.25 - 0.3 kg Terminal Wiring Screw clamp terminals for solid/stranded wires