Variable Speed Drives Altivar 21/Altivar 61 :  The Altivar 61 drive is a frequency inverter for 3-phase asynchronous motors rated between 0.75 kW and 630 kW. The drive has been designed for state-of-the-art applications in heating, ventilation and air conditioning (HVAC) in industrial and commercial buildings.

The Altivar 61 can reduce operating costs in buildings by optimizing energy consumption whilst improving user comfort. Its numerous integrated options enable it to be adapted to and incorporated into electrical installations, sophisticated control systems and building management systems.