What the line carries
The ACS355-03E-08A8-4 is a 3-phase 400 V ac inverter drive on frame size R1, product number ACS355-03E-08A8-4, rated 4 kW at 8.8 A. At 1.2 Kg net and 7 cm x 18.7 cm x 23.9 cm on the R1 chassis, it sits in the same panel footprint as the rest of the R1 cohort — useful when a spare slot was punched for the family, not for this specific current rating.
Where this rating sits in the R1 family
Inside the same R1 footprint, the ACS355-03E-01A9-4 is the 1.9 A / 0.37 kW point and the ACS355-03E-02A4-4 is the 2.4 A / 0.55 kW point — same chassis, same shipping weight of 2.5 Kg, same R1 frame. What changes is current and power: this 8.8 A / 4 kW unit is several steps up the rating ladder from those siblings, so the footprint swap is mechanical but the motor feeder, breaker sizing, and thermal margin are not — substituting the 1.9 A or 2.4 A variant into an 8.8 A slot would not carry the motor.
What a swap actually requires
Same R1 frame and same 1.2 Kg net weight means the mechanical drop-in is straightforward on a panel that was laid out for the ACS355 family — the mounting holes, cooling clearances, and terminal landing all carry across the R1 cohort. Beyond the chassis, the parameters that do not carry between ratings are the motor-side sizing: feeder protection, contactor class, and brake-resistor selection are all anchored to the 8.8 A / 4 kW rating on this specific code, not to the R1 frame in general.