Manual regulation of speed or airflow of voltage controllable (230 Vac, 50 Hz) motors and fans. Several motors can be connected as long as the current limit is not exceeded. These speed-controllers offer an excellent and accurate regulation. What’s more, the splash-proved housing (as well with inset as with surface mounting) allows the use in a demanding (damp) environment. E.g. kitchens or bathrooms… Fast current and temperature fuses complete this user-security.