Depending on the hardware in your facility, you may be required to purchase a digital rotary phase converter or rotary phase converter. A digital rotary phase converter is engineered to provide 3 phase power to your equipment at the start of the operational process. However, this type of phase converter for sale will transition to providing single phase power throughout the remainder of the operation cycle. Types of equipment that require a high torque start-up and lower horsepower (HP) ratings include milling systems and commercial saws.