Key Specifications Parameter Value Brand Schneider Electric (formerly nVent/Samwha EOCR) Series EOCR-ZQD Product Type Electronic Motor Protection Relay with Earth Fault Protection Model / Reference EOCR-ZQD-CM7 Technology Microcontroller (MCU) based with zero-sequence current detection for earth fault Current Measurement 3-CT design (three current transformers) with zero-sequence detection Current Setting Range Dependent on specific variant (verify with datasheet) Earth Fault Current Setting Highly sensitive (typically 0.03-10A adjustable) Control Voltage 7: 220VAC 50/60Hz Frequency 50/60 Hz Protection Functions • Overcurrent (Overload) • Phase Loss / Open Phase • Phase Reversal (Reverse Phase) • Phase Imbalance / Unbalance • Locked Rotor (Stall) • Earth Fault (Ground Fault) using zero-sequence current detection Output Contact Configuration Dependent on "M" designation (verify with datasheet) Output Contacts Multiple relay outputs for trip and alarm functions Contact Rating: 3A / 250VAC resistive Trip Time Characteristics Definite time Time Delay Settings • Start Delay (D-TIME): Adjustable • Trip Delay (O-TIME): Adjustable • Earth Fault Trip Delay (E-TIME): Adjustable Reset Mode Manual (Instant) / Electric (Remote) selectable Display / Indication LED indicators for power ON and trip status (fault cause identification) Mounting 35mm DIN Rail / Panel mount Special Features • Zero-sequence current detection for accurate earth fault sensing • High sensitivity to ground faults • Separate earth fault trip delay setting Standards IEC 60947-4-1, UL, CSA Degree of Protection IP20 (relay body) Operating Temperature -20°C to 60°C Storage Temperature -30°C to 80°C Dimensions (W x H x D) Standard size for EOCR-ZQD series Weight Approximately 0.2 - 0.25 kg Terminal Wiring Screw clamp terminals for solid/stranded wires