The Yaskawa HV60U4052CFA 40HP Variable Frequency Drive (VFD) is a 480V, three-phase HVAC drive rated at 52A, designed to regulate motor speed and torque by varying the frequency and voltage supplied to the motor. It is commonly used with commercial HVAC equipment such as air-handling unit fans, supply and return fans, exhaust fans, cooling-tower fans, and pumps. https://www.partshnc.com/yaskawa-hv60u4052cfa-40hp-variable-frequency-drive-52a-480v-3ph