What it is
The ACS550-U1-02A7-6+B055: At a listed weight of 9.98 kgs it sits at the lighter end of the ACS550 family — a single-installer lift into a panel cut-out rather than a floor-standing cabinet, which is the handling clue panel builders and MRO storeroom keepers will read first.
Read the +B055 suffix before you quote it
The +B055 suffix on this ACS550-U1-02A7-6 order code is an ordered option code, not a marketing tag, so the drive ships configured for that option out of the factory — verify the option list on the ABB ACS550 ordering grid matches your I/O, brake-chopper, and communication-card needs before locking the BOM line.
How it sits against same-series siblings
On the HVAC/bypass-flavored side, the ACH550-UH-023A-4 lists at 11.34 kgs and pairs an ACH550 with a manual bypass — close in mass but a different product line with different default macros, so treat it as a reference point, not a functional substitute for the ACS550-U1-02A7-6+B055.
Sourcing posture
Compliance documentation (UL/IEC/CE/RoHS/REACH attestations, certificates of origin, and the +B055 option declaration) is handled per RFQ rather than as a standing claim on this listing — raise the specific certs you need at quote time so they ride with the order rather than being assumed.