ABB ACS880-904-0900A-5 779 kW regenerative rectifier unit. ABB ACS880-904-0900A-5 is a current air-cooled ACS880-904 regenerative rectifier unit rated 779 kW and 900 A at 380-500 V AC, using R8i + BL-15-5. It returns braking energy to the AC network and stabilizes the common DC bus for coordinated multidrive systems. Typical applications include cranes, elevators, winders, downhill conveyors, test benches, marine systems and regenerative process machinery. This is a cabinet-building module, not a complete cabinet.