What the order code is and what it carries
The ABB ACS800-U1-0030-7+K451+P901 is the AC drive entry ASEA BROWN BOVERI catalogs under this exact string, with the +K451 and +P901 suffixes carried into the build rather than ordered as loose accessories — that matters for the BOM because options land as factory-fit, not field-added.
Where this class of drive sits in the line
It belongs to the Motor Drives segment under Drives, the same category grouping that handles low-voltage industrial AC drives from ABB used to run three-phase induction and synchronous motors on standard factory power.