What the part is
The ABB ACS550-01-05A4-4 is an ACS550-series low-voltage AC drive in the Motor Drives line, listed at 2.80 kg. It sits in the Motors & Motor Controls › Drives › Motor Drives class — the standard general-purpose drive slot rather than a dedicated machinery or active-front-end variant. The 2.80 kg figure matters mainly for cabinet handling and panel load rather than selection: it confirms a compact frame that a single technician can seat on the backplate without a lift, which lines up with the ACS550's typical wall-mount footprint in control rooms and MCC cubicles.
Class and where it fits
ACS550 series drives are the workhorse general-purpose VFDs used to run standard induction motors in fan, pump, conveyor and simple process lines — the class a panel builder reaches for when the application is variable speed on a four-pole motor and nothing exotic is being asked of the drive.
Sourcing and RFQ posture
For a buyer filling a BOM line on this exact order code, the correct path is to send the RFQ with the part number, the driven motor rating and the panel voltage class; we will return a firm quote against the channel that actually holds the code.