SINAMICS S150 is an enclosed air-cooled AC/AC variable speed drive ideal for high performance applications that require power regeneration back into the power supply system.They are particularly suitable for use in situations requiring strong demands on dynamics and speed accuracy, high-performance speed control, frequent braking cycles with high braking energies, and 4-quadrant operation. SINAMICS S150 cabinet units are available for the power range from 100 to 1500 Hp (75 to 1200 kW).