What this code resolves to
The ABB ACS800-U1-0009-5+K451+L502+L503+P901 is the base ACS800-U1 wall-mount drive in frame size for the 0009-5 current rating, dressed with four factory-installed option suffixes — +K451, +L502, +L503 and +P901 — that ship on the same nameplate and are part of the same order code, not separate line items. It sits in the ABB low-voltage AC drive family on the Motors & Motor Controls / Drives / Motor Drives line, and the -U1 form factor is the cabinet-mount execution of the ACS800 platform rather than the module-style -M3 or the cabinet-built -U2 / -U3 / -U4 versions.
Ratings worth checking against the BOM
Spec evidence on file is limited to the listed mass of 6.80 kg. The base current rating, overload profile, input voltage class, and meaning of the +K451, +L502, +L503 and +P901 suffixes must be confirmed from the drive's nameplate.
Commissioning pointer
For any ACS800-U1 in this frame, the first power-up sequence is the standard ABB low-voltage drive routine — confirm the -0009-5 current rating matches the motor nameplate, verify the input voltage class on the supply, then bring the DC link up through the precharge before enabling the run signal; the option-suffix meaning for +K451 / +L502 / +L503 / +P901 on this specific unit is configuration-defined and must be read off the drive's parameter summary, not assumed from the suffix code alone.