Technical Parameters (Specifications) EOCR: Electronic OverCurrent Relay series FE: Likely indicates the specific series (possibly "FE" = Full-featured Electronic) 420: Current rating or voltage class (400V class / 420V max) WR: Likely indicates Wide Range adjustment capability 03: Specific current range variant Electrical Data Product Type: Electronic overload relay Rated Insulation Voltage: 600 V AC maximum Rated Operational Voltage: 380...480 V AC (three-phase) Frequency: 50/60 Hz Control Supply Voltage: 100...240 V AC/DC (typical) Current Settings Current Range: [Adjustable - typical ranges for "03" variant: 3-30 A or 10-60 A - verify] Overload Setting: Adjustable within selected range Phase Loss Sensitivity: < 30% of rated current (typical) Phase Imbalance Protection: Adjustable (typically 5-30%) Ground Fault Protection: Adjustable (typically 0.03-10 A) Protection Functions Overload Protection: Thermal model with Class 5, 10, 20, 30 selectable trip curves Phase Loss Protection: Instantaneous trip upon phase failure Phase Reversal Protection: Detects incorrect phase sequence Phase Imbalance Protection: Adjustable trip level Ground Fault Protection: Residual current detection Undercurrent Protection: For load loss detection (pumps, conveyors) Jam Protection: For sudden overload conditions Short Circuit Protection: Instantaneous trip Display & Interface Display Type: Digital LCD or LED display Indications: Current reading, fault type, trip status Setting Method: DIP switches or push buttons (depending on variant) Trip Indication: LED for each protection function Outputs Trip Relay: 1 or 2 SPDT relays (250 V AC, 5 A typical) Alarm Relay: Optional (for pre-alarm indication) Analog Output: 4-20 mA (optional, for remote current monitoring) Communication (Optional) Communication Protocols: Modbus RTU (RS-485) available on some variants Baud Rate: 9600...38400 bps (configurable) Environmental Degree of Protection (IP): IP20 (enclosure) / IP40 (front panel) Operating Temperature: -20...70 °C Storage Temperature: -30...80 °C Relative Humidity: 5...95% (non-condensing) Altitude: Up to 2000 m Mechanical Mounting Mode: DIN rail mount (35 mm) or panel mount Dimensions (W x H x D): Approximately 68 mm x 90 mm x 115 mm (typical) Net Weight: Approximately 0.4 kg Terminal Type: Screw terminals (up to 4 mm² wire) Certifications Standards: IEC 60947-4-1, UL 508, CSA C22.2 Certifications: CE, UL, cUL, CCC, EAC RoHS Compliance: Yes