Technical Parameters (Specifications) Electrical Data Product Type: Electronic overload relay Rated Insulation Voltage: 600 V AC maximum Rated Operational Voltage: Up to 480 V AC (three-phase) Frequency: 50/60 Hz Power Supply: Self-powered (from main circuit) or external control voltage depending on variant Current Settings Current Range: Adjustable 5-20 A (typical for 20NV7Q variant) Overload Setting: Adjustable via dial Trip Class: Fixed (typically Class 10 or 20) Phase Loss Sensitivity: Trip within 3 seconds (typical) Phase Imbalance Protection: Fixed (typically 30-50% imbalance) Protection Functions Overload Protection: Thermal model with fixed trip curve Phase Loss Protection: Instantaneous trip upon phase failure Phase Imbalance Protection: Detects significant current imbalance Short Circuit Protection: Coordination with backup fuse/MCCB required Outputs Trip Relay: 1 SPDT relay (250 V AC, 3 A typical) Output Contact Configuration: 1 changeover (C/O) contact Trip Indication: Red LED indicator Reset Modes Manual Reset: Via push button (local) Auto Reset: Selectable via DIP switch (with fixed delay) Remote Reset: Optional (via external contact) Mechanical Mounting Mode: DIN rail mount (35 mm) or panel mount Terminal Type: Screw terminals (up to 6 mm² wire) Dimensions (W x H x D): Approximately 45 mm x 70 mm x 80 mm (typical) Net Weight: Approximately 0.2 kg Environmental Degree of Protection (IP): IP20 (enclosure) Operating Temperature: -20...60 °C Storage Temperature: -30...80 °C Relative Humidity: 5...95% (non-condensing) Altitude: Up to 2000 m Certifications Standards: IEC 60947-4-1, UL 508, CSA C22.2 Certifications: CE, UL, cUL, CCC, EAC RoHS Compliance: Yes