Both the PowerFlex 4 and the PowerFlex 40 are variable frequency drives (VFDs) made by Rockwell Automation’s. Despite their similarities, the two models have a few significant variances. Power Rating: Power ratings up to 22 kW (30 horsepower) are available for the PowerFlex 4, while power ratings up to 55 kW (75 horsepower) are available […]
