The SCB11 provides eight channels of relay outputs. Each channel is rated at 240V AC 5A by using high quality relays. Normally-open and normally-closed change-over contacts for each channel are available; on-board LEDs show which relays are active, and links select which I/O lines are used from the 50-way industry standard I/O connector, allowing up to four SCB11s to be 'daisy-chained' on the same ribbon cable.

It has an alternative, much smaller connector which carries the 8 control signals plus 0V and 5V.

It is a very simple board, just a ULN2803 Darlington driver switching some relays.