The ABB ACS355-03E-02A4-4 is an inverter drive in the ACS355 series, rated 0.55 kW (0.75 hp) on a three-phase 400 V supply with a 2.4 A output current (I2N), built on the R1 IP20 frame. Typical losses for this rating are 28 W, which is what the enclosure thermal budget has to clear with the R1 heatsink profile.
I2N of 2.4 A is the continuous figure that has to clear the motor nameplate FLC, and 0.55 kW / 0.75 hp sits inside that rating. The drive weighs 1.2 Kg net and 2.5 Kg shipping in the R1 IP20 frame, bench-portable for one technician.
Cross-reference within the family
The adjacent ACS355-03E-01A9-4 in the same R1 frame is rated 0.37 kW (0.5 hp) at 1.9 A — same footprint and same input voltage, so a panel laid out for the 01A9-4 will accept the 02A4-4 with no rewiring; the only change is the parameter set and the motor nameplate values driven into the start-up routine. Going the other way, the ACS355-03E-08A8-4 stays in the R1 frame at 380–480 V input, so for sites that have standardised on the R1 cut-out and need a higher-current unit, the swap is mechanical only and the commissioning macro changes.