ATV61 variable speed drive controllers - IP 21 Frequency controllers for three-phase 0.75 to 7.5kW synchronous and induction motors. Class of protection IP21 for bare controllers and IP41 on the upper part. Enables drive control of three-phase induction cage motors with three-phase power supply. Output control frequency: 0.5 to 1600Hz. 16 pre-selected speeds, more than 150 functions. Applications for fluid control such as ventilation, air conditioning, pumping.