What this listing is
The ACS550-U1-015A-4+B055: Listed weight on this drive is 16.87 kgs. That is the only figure on the spec sheet that drives handling — it is a multi-handle install and the panel layout has to carry it, which is worth flagging at the BOM stage.
What the listed specs actually decide
On the spec sheet for this listing, only the part identifier, the option suffix, the 16.87 kgs weight and the category placement are grounded. Voltage class, current frame, hp/kW rating, I/O map, firmware version and SCCR headroom are not in evidence for this row and are not asserted here — those are the ratings a commissioning engineer normally cross-checks against the motor nameplate and the panel single-line before this drive goes on the BOM.
Class and how it is used
ACS550-series units are general-purpose AC drives used to vary speed and torque on three-phase induction and permanent-magnet motors in panels and skids — fans, pumps, conveyors and mixers are the typical loads. The +B055 suffix is one of ABB's factory option codes; on the ACS550 platform option codes typically alter I/O, braking, coating or keypad configuration, so any cross-reference has to keep the suffix string intact to be a true like-for-like.