Voltage relay Argus 7SR157, check synchronising, case I/O and fascia: 2 VT, 6 binary inputs / 8 binary outputs, 10 LEDs, measuring input: 40 - 160 V, 50/60 Hz, auxiliary voltage: 80-250 V DC / 115 V AC, binary input threshold 19 V DC, communication interface: standard (USB front port, RS485 rear port) E4 case, IEC 60870-5-103, Modbus RTU and DNP3, front cover: push buttons - down and right arrows