If you are using a discrete VAC I/O base such as a 170 ADI 540 50 or a 170 ADO 540 50, refer to the drawing below for your dimensions.
The minimum depth dimension (65 mm) is determined by the unit housings, not the wiring terminals.
The figure on the right shows an addition 30 mm length dimension for an optional three-row busbar.
The following illustration shows dimensions for this assembly.
