What it is
The ACS180-04S-09A4-4 is the small-frame end of the ACS180 line, with a listed weight of 0.56 kg for panel builds where space and mass drive the layout.
Class context
Compact AC drives in this class are the workhorse for fan, pump, conveyor and small machine-tool spindles — typically fitted where a PLC or motion controller hands off a speed reference and the drive handles the motor-side switching and protection on its own. The ACS180-04S fits that slot, with the part number pinning the voltage class, frame size and current rating so the panel builder cannot accidentally cross the parts.
Handling note
The 0.56 kg figure is light enough that one tech can lift and seat the drive by hand on a DIN-rail or panel mount without rigging — a useful contrast when swapping against heavier legacy units on a hot line, but not the selection parameter. What matters at install is the panel cut-out and the cooling clearance around the heatsink; the weight just tells you it is not a two-person lift.