What landed on the bench
The ABB ACS800-U1-0011-5+K466+L502+L503+P901 is a configured ACS800-U1 wall-mount drive sitting in the Motor Drives line under Drives, with the full option string carried in the order code rather than broken out as separate SKUs (K466, L502, L503, P901 all travel on the same nameplate). For panel-builder planning the drive weighs 9.07 kg, which keeps it in the one-person carry class and means no special enclosure bracing beyond the standard wall-mount footprint of the U1 frame.
Where it sits against the ACS880 swap
The ACS880-01-052A-5 is the natural same-shelf successor the buyer would weigh against this code — both are wall-mount drives in the Motor Drives class, both record 9.07 kg on the spec line, and the ACS880 family is the platform ABB rolled the ACS800 install base forward into. Drop-in compatibility without a re-parameter and re-wire pass is not something the spec strings alone confirm — the +K466/+L502/+L503/+P901 options are ACS800-era codes and their mapping onto the ACS880 option set is the question an integrator has to walk through before quoting a swap.