What the line is
The ABB ACS800-U1-0040-5+P901 sits in the Motor Drives line as a wall-mount AC drive from the ACS800-U1 family, with the +P901 factory option applied to the base 0040-5 frame code. At 26.31 kg, the unit lands in the two-person lift class for a single-cabinet install; the listed weight is the figure carried on the order record, not a selected parameter.
Functional second-source against the ACS880-01 frame
The closest wall-mount ABB part in the same product class is the ACS880-01 family, with the ACS880-01-040A-5 and ACS880-01-065A-5 cited as same-line candidates at 18.14 kg and 23.13 kg respectively. Footprint, control terminal layout, and the fieldbus option-card slot are not declared identical on the seed record, so a panel cut for ACS800-U1-0040-5+P901 is not a guaranteed drop-in for an ACS880-01 — treat the swap as a re-engineering decision driven by the panel drawing, not by the order code alone.
Documentation pack expectations
The compliance buyer working this part number needs the nameplate-to-PO trace: the order code on the shipping label must read ACS800-U1-0040-5+P901 exactly, the +P901 option must be present on the drive's option label, and the declaration-of-conformity pack should be requested at RFQ time and matched to the serial range on the unit before sign-off.
Sourcing posture
The part is specified into the BOM as ACS800-U1-0040-5+P901 and quoted to order against an RFQ; pricing and lead time travel with the quote, not the listing line.