Available in three different models that have a 0-10 V or 4-20 mA input signal. This 20 Amp model has easy to access toggle switch to select manual or automatic mode as well as a manual speed selector dial on the faceplate. Internal minimum speed adjustment with the possibility to work continuously at minimum speed. Comes in a rugged, sealed enclosure that protects from light, moisture, and dust. Includes extended supply voltage range and a radio interference filter.