What it is, and why the catalog line is closed
The ACS800-U1-0205-5+P901: Listed mass is 70.31 kgs — a wall-mount frame that wants a two-person lift and an engineered cleat, not a bench swap. Treat the weight as a handling constraint on a service exchange, not as a way to choose between drives.
Sourcing posture for a discontinued drive
Compliance packs (declarations, origin paperwork) trace to the build lot the unit came out of; ask for the documentation list at RFQ time rather than assume a generic ABB packet covers a +P901-suffixed unit.
Same-function sibling worth weighing
The ABB ACS880-01-156A-5 is the same-function wall-mount successor candidate a buyer is most likely to cross-shop against this part. Listed mass is 55.00 kgs against 70.31 kgs on the ACS800-U1-0205-5+P901, which is a real handling-class delta on a service swap. Footprint, control terminal layout, and fieldbus card position are not on this ledger, so a drop-in panel claim is not earned from the spec sheet. Mechanical and electrical compatibility has to be confirmed at the nameplate and parameter-file level before any substitution is signed off.
Cross-shop gates that should not be crossed on this ledger
The ACS580-01-180A-4 (54.43 kgs) and ACS550-U1-157A-4 (89.81 kgs) are adjacent ABB drive lines, but the ledger does not establish a same-function replacement relationship to the ACS800-U1-0205-5+P901. They are not a parameter-for-parameter swap and should not be specified in its place without a nameplate review. On the ACS800-U1 frame, parameter set, control board revision, and fieldbus option cards drive the actual fit. The +P901 suffix in the order code is the only documented marker for the option content, so the RFQ has to carry it verbatim.