Parameter Value Product Range EOCR (Electronic OverCurrent Relay) - 3BZ2 Series Product Type Digital Electronic Motor Protection Relay with Built-in ZCT Product Code / Model EOCR-3BZ2-WRAUHZ (also written as 3BZ2-WRAUHZ) Current Setting Range 0.5 ~ 80 A (definite time, direct through-hole) 0.5 ~ 32 A (inverse time, direct) Above ranges require external CTs Ground Current Setting Range 0.03 ~ 10 A (adjustable) Control Supply Voltage (Us) 100-240 V AC/DC (85%~110% of rated voltage) Supply Frequency 50 / 60 Hz Power Consumption Less than 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, Ground Fault (Leakage), 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 seconds; Inverse time: 1-30 classes Undercurrent Delay: OFF, 1-10 seconds adjustable Phase Loss Delay: OFF, 0.5-5 seconds adjustable Locked Rotor Delay: 0.2-5 seconds adjustable Reverse Phase Trip Time: OFF, within 0.15 seconds Current Unbalance Delay: 1-10 seconds adjustable Ground Fault Delay: 0.05-10 seconds adjustable Display 7-segment LED (3-phase current values, ground leakage current, trip causes, setting parameters) + Bar graph (load factor 65%~100%) Output Contacts (A-type) OL (Overload): 1 NC + 1 NO (95-96 / 97-98) GR (Ground): 1 NO (57-58) Contact 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, High-frequency component filtering for ground fault detection, Fail-safe mode, Running time accumulation 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: 56.3 mm × 70 mm × 108 mm Net Weight Through-hole type: 0.425 kg Rated Insulation Voltage (Ui) 600 V AC conforming to UL/CSA/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, UL, CSA, CE, ROHS Warranty 18 months Short-circuit Protection 4 A gG fuse