ABB RDH913A Process Controller Module Assembly

The ABB RDH913A Process Controller Module Assembly is a legacy process controller block originally built by ASEA BROWN BOVERI and later marketed under ABB. The RDH913A designation appears in several catalog and resale listings as a dedicated Process Controller, with some vendors also labeling it a Power Controller, which points to its role as a central control module within older ABB process automation architectures. Today, this module is commonly encountered as a used or refurbished spare part in vintage installations, with listings from Radwell and York Controls reflecting its continued availability in the aftermarket. Because it is a legacy hardware item, buyers should verify the exact part number and ensure any accompanying mounting, interface, or accessory components are present and compatible with the control cabinet in use. Documentation for RDH913A can be sparse, so confirm with the seller or ABB support about firmware compatibility, installation requirements, and system revision alignment before purchase. These realities mean the RDH913A is best approached as a niche, upgrade-path-limited component for preserving or repairing older ABB process automation systems rather than a plug-and-play replacement for current-generation controllers.