What the order code points at
The ABB ACS800-01-0060-3+P901 is the +P901 optioned variant on the ACS800-01 wall-mount AC drive family, filed in the Motor Drives class under Motors & Motor Controls. The +P901 suffix is an ABB plus-code option string; the base designation ACS800-01 carries the form-factor and the trailing code carries the rating frame — so the BOM line is unambiguous on the PO even if the option sheet is lost.
Same-class peers and where they sit
Weight parity alone does not make the ACS550-U1-072A-4+B055+L512 a drop-in for the ACS800-01-0060-3+P901 — they are different ABB drive families (ACS550 vs ACS800) with different control firmware, parameter sets, and option-card footprints, so any panel swap needs a control-side review, not just a dimensional check.