MOTOR PROTECTION RELAY (RHO) 4 CT, 3 BINARY INPUTS/ 5 BINARY OUTPUTS, 10 LEDS MEASURING INPUT: 1/5A, 50/60HZWITH SEF INPUT Auxiliary voltage: 24 to 250 V DC, 100 to 230 V AC, binary input threshold 19 V DC . USB FRONT PORT, RS485 REAR PORT PROTOCOL: IEC 60870-5-103 AND MODBUS RTU , DNP 3.0 OR MODBUS RTD CLIENT (USER SELECTABLE SETTING) FRONT COVER: NO PUSH BUTTONS PROTECTION FUNCTION: STANDARD VERSION