The Mitsubishi model you provided, FR-E540-0.4K, refers to an Mitsubishi Electric Variable Frequency Drive (VFD) inverter with a power rating of 0.4 kilowatts.
The Mitsubishi FR-A540-3.7K-CH is a frequency converter, often referred to as an inverter or variable frequency drive (VFD), manufactured by Mitsubishi Electric.
The Mitsubishi model you provided, FR-E540-0.4K, refers to an Mitsubishi Electric Variable Frequency Drive (VFD) inverter with a power rating of 0.4 kilowatts.
The Mitsubishi FR-A540-3.7K-CH is a frequency converter, often referred to as an inverter or variable frequency drive (VFD), manufactured by Mitsubishi Electric.