ASD-B3-1521-M-AC SERVO DRIVE 1.5KW 220S B3 6.The ASD-B3-1521-M-AC Servo Drive 1.5KW 220S B3 is a small, high-performance solution for accurate industrial motion control. With 1.5KW of power, superior control algorithms, and complete protective measures, it performs flawlessly in every setting.