Rating that drives the BOM decision
The 1.5 kW figure on the title line is the sizing point: pair it to a 4-pole induction motor of equivalent shaft rating and check the drive's output current against the motor's full-load amps, not against the kilowatt label, because the kW and the amp rating do not move in step across all supply voltages. At 1.14 kg the unit is wall- or panel-mountable by hand; no lifting plan or reinforced cabinet shelf is needed. Cable entry and cooling clearance still follow ABB's installation drawing, not the weight.
Why the +J400 suffix matters on this build
The +J400 option is part of the order code, not a field add-on. Different +J options change the control board and fieldbus interface, so the wrong suffix means a drive that powers up but cannot talk to the PLC on the existing wiring. Match the suffix letter-by-letter on the replacement BOM line.
ACS380-040C-05A6-4+K475 as a cross-shop candidate
The closest functional second-source from the same ABB catalogue is the ACS380-040C-05A6-4+K475. It is also a compact machine drive and sits at a near-identical mass of 1.13 kg, but the frame and option suffix differ. Treat it as an alternative for a new panel layout, not a guaranteed drop-in where an ACS355-03U-04A1-4+J400 is already wired in.
Sourcing posture
The order code ACS355-03U-04A1-4+J400 is quoted to order against an RFQ. For a line-down replacement, send the full MPN including the +J400 suffix so the supply channel confirms the option matches before shipment.