The ABB ACS550-01-031A-4+B055 is a three-phase 380-480 VAC, 50/60 Hz AC drive with a 31 A output rating corresponding to a 15 kW motor load on the ACS550 wall-mount platform. The +B055 suffix is the enclosure option, delivered as IP54/UL Type 12, which means dust- and splash-protected wall mounting rather than a cubicle-only build — useful when the drive has to live outside a clean panel room but still meet the same IEC installation and compliance footprint.
Sizing the fit before the panel is built
At 17.00 kgs the unit is a single-person lift, and with the IP54 wall-mount enclosure it fixes the cabinet envelope: the existing bracket and gland plate must accept this IP54 build rather than an open-chassis unit of the same 31 A, 15 kW rating. Within the same ACS550 family, the ACS550-U1-096A-4 is a larger-frame sibling carrying a higher current rating and roughly 19.96 kgs of mass — it is the same platform stepped up in rating, not a same-rating alternative, so a panel that was originally specified around it cannot accept this 31 A unit without reworking the motor branch, breaker sizing, and gland layout.