The MTY series are electronic fan speed controllers that allow you to manually regulate the speed of single-phase voltage controllable motors with a maximum current of 4 A by varying the motor voltage via phase angle control (Triac technology). The output voltage towards the motor can be manually regulated via the central knob from minimum to maximum (80 – 230 VAC). This knob also has an OFF position. Its functionality is: OFF – minimum speed – maximum speed. The minimum speed can be adjusted via an internal trimmer (80 - 180 VAC). The enclosure can be used for inset mounting (IP44) or surface mounting (IP54).