ASD-B3A-1021-E-AC SERVO DRIVE 1KW 220S B3A 4.ASD-B3A-1021-E-AC SERVO DRIVE 1KW 220S B3A 4 is an innovative tool for accurate motion control. With 1 kilowatt of power and compatibility with 220-volt AC, it's ideal for industrial automation, robotics, and CNC machining.