These inverters are commonly used in various industrial applications to control the speed and torque of electric motors.

Here is a breakdown of the model number:

ACS355: This refers to the series or family of the ABB inverter, which is the ACS355 series.

03E: This represents the power rating or frame size of the inverter. The exact power rating would depend on the specific variant of the ACS355.

38A0: This code typically represents the input/output voltage and current ratings of the inverter. Without more detailed information, it's difficult to provide specific information about these ratings.

4: This digit is typically used to represent additional features or options available for the inverter. Again, the exact interpretation of this digit would require more specific information.

ABB Inverter model 

ACS355-03E-01A2-4 0.37KW

ACS355-03E-01A9-4 0.55KW

ACS355-03E-02A4-4 0.75KW

ACS355-03E-03A3-4 1.1KW

ACS355-03E-04A1-4 1.5KW

ACS355-03E-05A6-4 2.2KW

ACS355-03E-07A3-4 3KW

ACS355-03E-08A8-4 4KW

ACS355-03E-12A5-4 5.5KW

ACS355-03E-15A6-4 7.5KW

ACS355-03E-23A1-4 11KW

ACS355-03E-31A0-4 15KW

ACS355-03E-38A0-4 18.5KW

ACS355-03E-44A0-4 22KW