The ACS550-U1-072A-4+B055+L512 is listed under Motors & Motor Controls as a Drive / Drive entry weighing 34.02 kg. The order code itself carries two factory option suffixes — +B055 and +L512 — on top of the base 072A-4 frame, which is how ABB ships a configured drive against a specific panel specification rather than a bare inverter.
Handling and panel-side notes
At 34.02 kg this drive is a two-person lift and the cabinet should be sized for that mass on the mounting plate before the unit is hoisted in — check panel-builder reinforcement against this figure rather than the lighter 19.96 kg ACS550-U1-096A-4 sibling weight, which reflects a different frame size in the same family.