What lands on the BOM line
The ABB ACS800-U4-0205-5+P901 is the ACS800 series in the U4 cabinet-mount build, carrying the +P901 option code suffix on a 0205-5 frame. It catalogs under Motors & Motor Controls → Drives → Motor Drives. U4 designates the cabinet-format enclosure rather than the wall-mount U1, so the unit ships as a floor-standing section rather than a through-hole panel piece — that distinction matters at the layout stage, not at the order-code stage.
Series context
The ACS800 family is ABB's older-generation industrial drive platform; the U4 cabinet build is the form factor typically specified where the drive sits in a dedicated MCC section rather than on a machine frame. The +P901 suffix is an option-code string that the order line needs to be quoted against as written.