ARGUS-C DIRECTIONAL OVERCURRENT RELAY 4 CT, 3 VT, 10 LEDS, 3 BINARY INPUTS/ 5 BINARY OUTP. MEASURING INPUT: 1/5A, 63.5/110V, 50/60HZ WITH SEF INPUT AUXILLIARY VOLTAGE: 80 TO 250V DC / 115V AC, BINARY INPUT THRESHOLD 19V DC . USB FRONT PORT, RS485 REAR PORT (E4 CASE) PROTOCOL: IEC 60870-5-103 AND MODBUS RTU AND DNP 3.0 (USER SELECTABLE SETTING) FRONT COVER: NO PUSH BUTTONS PROTECTION FUNCTION: STANDARD VERSION