What the line on the BOM actually is
The ABB ACS800-U1-0040-5+L500+L501+L503+P901 is a configured industrial AC drive from the ACS800-U1 wall-mount family. The order code bundles the base frame at size 0040 with the four option codes L500, L501, L503 and P901 installed at the factory. Option string L500+L501+L503+P901 is part of the configured MPN, not a separate accessory line; whatever those codes add — communication adapters, I/O extensions, encoder or panel modules, application firmware — is wired and tested before the drive leaves the factory, so the unit arriving on the dock is one part number to receive against the PO.
Mechanical footprint and handling
Listed mass is 25.85 kg, which puts the unit solidly in the two-person / hoist-required bracket for cabinet mounting — above the one-handed courier class but well inside what a single panel-builder can hang on a backplate with a second pair of hands; plan the lift and the sub-panel reinforcement around that figure rather than treating it as a bookcase-shelf component. As a U1 (wall-mount / book-style) frame, the drive mounts vertically in the cabinet with the cooling flow front-to-back, so leave the top and bottom plenums clear and respect the published clearance above and below the heatsink when sizing the enclosure.
Sourcing posture for this configured order code
A configured ABB MPN like ACS800-U1-0040-5+L500+L501+L503+P901 is built-to-order — the option string locks the BOM, the lead time tracks the longest-tail option in the suffix, and standard stocking rarely covers every L-code combination, so the procurement reality is to quote against the exact code rather than to chase a generic 0040-5 drive and retrofit options in the field. For critical spares, keep the configured MPN on the shelf rather than a stripped base unit — field-swapping option cards onto a replacement drive during a line-down event extends a planned swap into a longer restart.