What the line item is
The ABB ACS550-O1-290A-4 sits in the ACS550 series as an O1-frame drive. The on-record description carries it as a 'DRIVE by ASEA BROWN BOVERI', matching the legacy ABB naming still printed on nameplates and shipping cartons. At 68.04 kgs this is a two-person lift into the cabinet, not a bench unit. Plan the rigging and the panel reinforcement around that figure before the crate arrives — the mass drives lift points, dolly choice, and the cabinet's static load margin, and it is heavy enough that handling matters more than the printed spec sheet.
Sourcing posture for the BOM line
The BOM line carries no production-status flag for the ACS550-O1-290A-4, so lifecycle status is not stated in the evidence on hand. Specify and quote against an RFQ rather than assuming channel or lead-time posture. No official LTB or successor order code is on file for this part, which means there is no documented cross-reference to substitute from the same evidence bundle. If the panel needs a like-for-like replacement, the answer stays inside the ACS550 family or moves to a current-generation ABB drive on a fresh specification.
Where this class sits inside the ACS550 family
An ACS550-U1-059A-4+B055 shows up as a 59 A ACS550 with the +B055 option suffix appended, illustrating that the family uses plus-coded option strings on the base order code. A buyer reading a quote that carries '+B055' or similar on an ACS550 should expect the suffix to alter the BOM content, not just the documentation.