What this order code is
The ABB ACS800-U1-0100-5+L503+P901 is a wall-mount AC drive from the ACS800-U1 industrial series, carrying the +L503 and +P901 factory option codes as part of the configured order string. It falls under the Motors & Motor Controls → Drives → Motor Drives category trail and ships as an ABB-branded AC drive.
Frame and handling
The unit is listed at 34.02 kgs, which places it in the heavier wall-mount drive class — a two-person lift onto the backplate and a cabinet with the appropriate load rating are the realistic install assumptions.
Where it sits against same-function siblings
The ACS880-01-065A-5 is the current-generation wall-mount successor family at 23.13 kgs; the ACS800-U1-0100-5+L503+P901 at 34.02 kgs is a heavier frame with different footprint and option-code semantics, so a drop-in panel swap is not assumed without re-checking the cabinet layout, the cooling envelope, and the parameter set. The ACS550-U1-072A-4+B055+L512 and ACS550-U1-059A-4+B055 sit at 34.02 kgs and 36.29 kgs respectively — same general frame class, but a different family with a different control panel, different parameter structure, and different firmware, so any substitution has to be driven by a confirmed cross-reference, not by mass alone.