The board offers the possibility of individual control of 16 electromagnetic relays, with load circuits of 10A at 250V. The board is powered by supplying 5V and GND to the respective pins. The control pins are isolated with optocouplers, ensuring high safety and guaranteeing that no spikes will appear in the control electronics. The control pin levels are 5V tolerant. The control pins are controlled with active low voltage, and the relay interfaces have normally open circuits. All three relay outputs – normally closed, common, and normally open – are brought out to the output terminals and marked graphically.