The Com-Trol 40AB503G01, known as the RO-8 relay output board, is an eight-channel I/O module designed for the MCS-4000 control system and fits in the MCS-4000 eight-card cabinet. Each of its eight relays is rated at 3 A at 240 V and the board can be ordered with or without manual override switches to suit different control configurations. It supports front-mounting in the 8-card cabinet and, with standard mounting brackets, can be arranged for vertical side-by-side or horizontal stacking to expand automation capabilities such as compressor control and other multi-point load switching.
