Parameter Value Product Range EOCR (Electronic OverCurrent Relay) - I3M420 Series Product Type Communication-type, Integral (One-body) Intelligent Motor Protection Relay Product Code / Model EOCR-I3M420-WRDUHZ (also written as EOCRI3M420-WRDUHZ) Current Setting Range 0.5 ~ 80 A (definite time, direct through-hole) 0.5 ~ 32 A (inverse time, direct) Above ranges require external CTs Control Supply Voltage (Us) 100-240 V AC/DC (85%~110% of rated voltage) - indicated by "U" Supply Frequency 50 / 60 Hz Power Consumption ≤ 3 W Measurement Accuracy ±1% (enhanced with "Z" revision code) Protection Functions Overcurrent (OC), Undercurrent (UC), Phase Loss (Open Phase), Reverse Phase (Reversal), Locked Rotor (Stall), Current Unbalance, Pre-alarm Time Characteristics Definite Time / Inverse Time (1-30 classes) / Thermal Overload Inverse Time Time Settings Overcurrent Trip Delay: Definite time: 0.2-30 sec; Inverse time: 1-30 classes Undercurrent Delay: OFF, 1-10 sec adjustable Phase Loss Trip Time: OFF, 0.5-5 sec adjustable Locked Rotor Delay: 0.3-5 sec adjustable Reverse Phase Trip Time: Within 0.15 sec Current Unbalance Trip Time: 1-10 sec adjustable Display 7-segment LED (3-phase current values, trip causes, setting parameters) cycles at 5-second intervals; Bar graph (load factor 65%~100%) Analog Output 4-20 mA (isolated, current transmitter function) Communication Modbus RTU / RS-485 Output Contacts OL (Overload): 1 NC + 1 NO (95-96 / 97-98) - D type configuration Rating: 3 A / 250 V AC (resistive load) Reset Mode Manual (front panel) / Electric (remote) / Automatic (adjustable) Fault Memory Records last 3 fault causes with corresponding current values Additional Functions THD (Total Harmonic Distortion) measurement (with "Z" revision), Password protection, Running time accumulation, Pre-alarm, Fail-safe mode Wiring Type Through-hole (贯穿型) - indicated by "H" in model code Mounting 35 mm DIN Rail or Panel mounting Dimensions (W x H x D) Through-hole type: 70 mm × 56.3 mm × 108 mm Net Weight Through-hole type: 0.355 kg Rated Insulation Voltage (Ui) 600 V AC (UL/CSA), 690 V AC (IEC 60947-4-1) Rated Impulse Withstand Voltage (Uimp) 6 kV conforming to IEC 60947-4-1 Operating Temperature -20 °C to +60 °C Storage Temperature -40 °C to +85 °C IP Degree of Protection IP20 (enclosure) conforming to IEC 60529 Dielectric Strength 2 kV, 50/60 Hz, 1 minute (case to circuits) conforming to IEC 60255-5 Standards / Approvals IEC 60947-4-1, IEC 60255-6, UL, CSA, CE, CCC, RoHS Warranty 18 months