The VFD015S21D is model of Delta frequency drive. It is designed for controlling the speed of three-phase induction motors and offers advanced features such as variable torque and vector control. The drive has a power rating of 1.5 kW and operates at a voltage of 200-240 V AC. It supports multiple control modes and has built-in protection features for motor and drive protection. The VFD015S21D is commonly used in applications such as pumps, fans, and conveyors where precise control of motor speed is required.