Voltage relay Argus 7SR157, check synchronising, case I/O and fascia: 2 VT, 3 binary inputs / 5 binary outputs, 10 LEDs, measuring input: 40 - 160 V, 50/60 Hz, auxiliary voltage: 24-250 V DC / 100-230 V AC, binary input threshold 19 V DC, comms interface: standard (USB front port, RS485 rear port) plus additional rear optical Ethernet duplex (x2)(E6 case), IEC 60870-5-103, Modbus RTU, DNP3 and IEC 61850, front cover: push buttons - down and right arrows