The I-RC01 relay card is designed to work with the I-ON16 control unit. The relay card is intended for use when connecting the end station outputs to devices that require voltage free contacts on their inputs. The relay card is supplied with a short wiring loom that provides connections to each relay trigger input. A single wire allows you to connect the relay card to the 12V +ve aux supply in order to provide power for all four relays. The terminals on the edge of the card provides connection to the Normally Open, Common and Normally Closed terminals of the relays.