What the order code actually is
The ABB ACS800-U1-0020-5+B056+L502+P901 is a wall-mount AC drive from the ACS800-U1 family, with the +B056, +L502 and +P901 plus-codes stacked onto the base string — each plus-code is an option that ships factory-fitted, not a loose accessory, so the BOM line has to carry the full plus-code set or it won't match what arrives on the pallet. It sits in the ABB Motor Drives line, framed under Motors & Motor Controls → Drives → Motor Drives, which is the same class slot the ACS800 family has occupied since the U1 generation launched. Listed weight for the unit is 14.06 kg, which is the figure the panel-builder uses for backplate sizing and the one-person-lift handling plan during a swap-out.
Where it sits in the ABB drive lineup — the ACS880 question
The successor ABB wall-mount drive in the same class is the ACS880-01 series — catalog examples are the ACS880-01-040A-5 at 18.14 kg, the ACS880-01-034A-5 at 10.43 kg and the ACS880-01-027A-5 at 10.41 kg, weighed against the ACS800-U1 BOM line.
Sourcing posture for a plus-coded legacy ABB string
No production-status entry sits on the record for this MPN, so the sourcing posture is to quote against the full plus-code string — +B056 / +L502 / +P901 — and confirm the offered unit is built to that exact option set, not a base ACS800-U1-0020-5 with codes retrofitted. For an MRO buyer with a line down, the practical move is to send the failed unit's nameplate photo plus the full order string so the replacement is verified against the same plus-code stack; for a controls integrator stocking spares, the same plus-code discipline applies to the shelf unit so the spare is a true match when it goes in.