Bulletin 141A MCS Mounting

The Allen-Bradley Bulletin 141A MCS Mounting System is a modular component mounting and busbar distribution platform designed to organize, protect, and interconnect motor control and starter devices within panel assemblies. The 141A catalog number encodes the component type and key dimensional or functional attributes: the characters following 141A- identify the module category — BK denotes terminal cover hardware (with trailing digits indicating width and height in millimeters, e.g., 141A-BK228 for a 228 mm wide, 200 mm tall cover), APC indicates pull-apart control plugs (with the following number specifying pole count, e.g., 141A-APC10 for 10-pole, 141A-APC12 for 12-pole), and AS identifies spacer modules sized for ISO module configurations. Adapter modules such as the 141A-NFD160 NH fuse switch disconnector adapter and the 141A-VS235 single-profile terminal adapter extend the system's flexibility for busbar integration. Shroud kits like the 141A-BKC (front, 1100 mm) and 141A-BKS (top/bottom, 1100 mm) provide enclosure protection for extended busbar runs. For complete dimensional and compatibility specifications, consult the Bulletin 141A MCS Mounting System Technical Data.