Here's a breakdown of the model number specifications:

ACS355: This indicates the series or family name of the inverter.

03E: This refers to the power rating or frame size of the inverter. It represents the physical size and power capacity of the device.

02A4: The "02A4" portion of the model number typically represents additional options or features that may be included with the base inverter model.

4: This number usually denotes the voltage rating for the inverter. In this case, it suggests that the inverter is designed to operate with a 400V power supply.