.The ATRK 7 is a regulator for single-phase AC fun motors with speed control made by Indel. It can operate on AC voltage of 230V with a frequency of 50Hz and be used with single-phase AC motors with a power rating between 1/6 HP and 2 HP. This electronic part provides good performance, with an adjustable speed range of 1-100 Hz and soft start, a motor protection feature, which ensures a smooth and gradual speed increase while reducing motor and capacitor stress. Its robust and rugged design ensures reliable and durable performance even in harsh conditions. The ATRK 7 also has the ability to drive a 3-phase motor with a single-phase induction supply, and it is suitable for most fan applications, including ventilation, cooling and air compression.