What lands on the BOM line
The ABB ACS380-040C-032A-4+K490 sits inside the ACS380 machinery-drive family, catalogued under Motors & Motor Controls › Drives › Motor Drives. The +K490 suffix rides on the 040C-032A-4 frame, so the panel-builder is specifying the heavier-current ACS380 housing rather than a micro-frame variant.
Where this frame sits against a sibling
The +K490 suffix also appears on ACS380-040C-02A6-4+K490 at 1.81 kgs — same option code, smaller current frame. The closer functional alternative within the same option family is ACS380-040C-032A-4+K475, which matches the 5.90 kgs mass of the seed; the +475 vs +490 suffix is where the configuration delta lives.