DUOBIAS-M TRANSFORMER DIFFERENTIAL RELAY (2 WINDING) E8 CASE, 6CT, 2EF/REF CT, 1VT, 9 BINARY INPUTS/ 6 BINARY OUTP. 16 LEDS MEASURING INPUT: 1/5 A 63.5/ 110V, 50/60HZ REGION WORLD, LANGUAGE: ENGLISH USB FRONT PORT, RS485 REAR PORT IEC 60870-5-103, MODBUS RTU AND DNP 3.0(USER SELECTAB. SETTING) PROTECTION FUNCTION: STANDARD VERSION + UNDERCURRENT (37) NEGATIVE PHASE SEQUENCY O/C THERMAL OVERLOAD (49) INSTANTANEOUS PHASE FAULT O/C INSTANTANEOUS EARTH FAULT TIME DELAYED PHASE FAULT O/C Auxiliary voltage: 24 - 250 V DC / 100-230 V AC Binary input threshold 88 V DC (rated: 110-250 V DC)