DIGITAL DIFFERENTIAL PROTECTION RELAY, FOR TRANSFORMER, GENERATORS, MOTOR AND SHORT CABLE 4-LINE ALPHANUM.BACKLIT DISPLAY 7 PROGRAMMABLE LED, NAVIGATION KEYS, FUNCTION KEYS, CASE 1/3 X 19", 3BI, 4BO, 1 WATCHDOG CONTACT, 7I, IEE, CURRENT TRANSFORMER: 1A SUPPLY VOLTAGE: DC 24V TO 48V, TRIGGER LEVEL BINARY INPUT 19V FLUSH MOUNTING CASE, SCREW TERMINALS (DIRECT WIRING/RING LUGS) REGION WORLD, 50/60HZ, IEC/ANSI, LANGUAGE ENGLISH (LANGUAGE CHANGEABLE) SYSTEM PORT (ON REAR OF DEVICE) PORT B IEC 60870-5-103 PROTOCOL, ELECTRICAL RS485, DIGSI 4/MODEM PORT (ON REAR OF DEVICE) PORT C DIGSI 4, BROWSER OR THERMO-BOX, ELECTRICAL RS485 BASIS MEASURED VALUES, FAULT RECORDING FUNCTIONALITY: DIFFERENTIAL PROTECTION, BASIC FUNCTION, DIFFERENTIAL PROTECTION TRANSFORMER, GENERATOR, MOTOR, BUSBAR,