ABB ACS880-11-021A-5 11 kW regenerative drive. ABB ACS880-11-021A-5 is a current ACS880 regenerative wall-mounted drive rated 11 kW, 21 A, 380-500 V AC, frame R3, IP21. Its active supply unit returns braking energy to the network and maintains total harmonic current distortion below 3% under nominal undistorted-network conditions. It provides Direct Torque Control, Safe Torque Off and flexible industrial communications for demanding applications across industrial applications.