VFD004L21A is a model of the Delta VFD-L series variable frequency drive. It is designed for controlling the speed of three-phase induction motors. The VFD004L21A is capable of handling a motor power of up to 0.4 kW (0.5 HP) and operates on a voltage range of 200-240V AC. It offers various control modes, such as V/f control and sensorless vector control, to meet different application requirements. The drive supports multiple communication protocols, including Modbus-RTU, to enable easy integration into industrial automation systems.