The ABB ACS800-01-0120-3+P901 is the wall-mount AC drive from the ACS800 family, sitting in the Motor Drives line under Motors & Motor Controls with the +P901 option suffix specifying the drive's factory configuration.
Where this drive class gets specified
ACS800 wall-mount units like this one are typically specified in industrial cabinet builds where a single low-voltage AC drive feeds one motor on a dedicated MCC section, rather than a multi-drive common bus, so the install footprint is the cabinet face area plus the cable bend radii behind it.
Where the ledger actually lets us comment — and where it does not
For procurement that means an RFQ pulls a fresh quote rather than a web-shop add-to-cart, and the BOM freeze question (is the code still good for next year's build?) has to be answered off-ledger with ABB channel feedback before the line goes to paper.