What it is
The ABB ACS800-U1-0004-5-P901 is an AC drive in ABB's ACS800-U1 wall-mount family, ordered under the +P901 option suffix and listed in the Motor Drives category. It carries a listed weight of 7.71 kg, which is the figure that governs single-person handling and the load the enclosure backplate must carry when the drive is wall-mounted rather than cabinet-mounted.
Where the ACS800-U1 line is used
ACS800-U1 wall-mount drives are the form factor an integrator drops into a stand-alone enclosure for a single motor on a process skid, a pump station, or a fan plenum — the +P901 suffix typically denotes a factory option bundle, so the same base order code shows up across OEM machines built to one specification. Selection of a frame in this family is driven by motor current and overload duty rather than by enclosure volume, so the 7.71 kg mass here is a handling datum more than a sizing datum — the cabinet footprint is fixed by the frame, the current rating is fixed by the frame, and the option suffix only changes the I/O, feedback, or coating package.
Same-frame successor in the ACS880-01 family
The ACS880-01-021A-5 lists 7.71 kg, identical to this ACS800-U1 drive at 7.71 kg — the matching mass is the strongest footprint tell that ABB built it in the same wall-mount frame size rather than a re-rated chassis. That equal-mass match is what a panel-builder actually needs: same frame, same mounting hole pattern, and the same enclosure depth class mean a swap from the ACS800-U1 frame into the ACS880-01-021A-5 frame usually does not force a re-cut of the backplate, even though the control board, parameter set, and fieldbus option slot are not pin-compatible and the parameter map has to be re-entered.
Sizing reference against other ACS880-01 frames
Within the ACS880-01 family, the ACS880-01-07A6-5 lists 6.35 kg — a lighter frame aimed at smaller motors — and the ACS880-01-052A-5 lists 9.07 kg, a heavier frame for the next step up in current class. Read against this ACS800-U1 drive's 7.71 kg, the ACS880-01-021A-5 lands as the same-frame successor, the 7A6-5 sits below as a downgrade candidate, and the 052A-5 sits above as an upgrade — the mass scale tracks the motor-current scale rather than the feature set.
Sourcing posture
The ACS800-U1 line is sourced to order against an RFQ — specify the full option string +P901 on the BOM line so the quote matches the exact drive the panel was designed around, and so the replacement, when it comes, lands as the same ACS880-01-021A-5 frame rather than a re-rated chassis.