Capa 7SR191, capacitor bank protection relay, housing I/O and fascia: 4 CT, 6 binary inputs / 8 binary outputs, 10 LEDs, measuring input: 1/5 A, 50/60 Hz, auxiliary voltage: 24-250 V DC / 100-230 V AC, binary input threshold 88 V DC, communication interface: standard version: USB front port, RS485 rear port plus rear optical Ethernet duplex (x2) (E6 Case), IEC 60870-5-103, Modbus RTU, DNP3 and IEC 61850, standard version - no push buttons