The Elta 149-TC33 is a 3‑phase transformer speed controller designed to manage fan speeds in five discrete steps, supporting loads up to 3 amps. Encased in an IP40-rated enclosure, it’s suitable for environments with operating temperatures up to 40°C. This controller is particularly suited for areas where noise is a concern, as it eliminates the magnetic hum associated with stepless controls. Please note that illuminated on/off switches and MCB protection apply only to single-phase versions.