The official business definition of Variable Frequency Drive (VFD) with bypass is a system that uses electronic switching devices to regulate and control the speed and voltage for an alternating current (AC) motor. This type of system includes both a VFD, which fluctuates the frequency in order to achieve desired results, as well as a bypass circuit, which allows the operator to quickly switch between the VFD and directly mains mode of operation while completely bypassing the VFD in certain conditions. This setup ensures efficient performance while mitigating the risk of damage to the motor due to operating at levels outside of its optimal operating range. VFDs with a bypass circuit are commonly used in industrial applications such as air conditioning and heating systems, pumps, fans, and more.