The Motorized Potentiometers are classified depending on the type of Voltage, Motor, Potentiometer, and Mounting. The units are used in control systems to apply a command variable to automatic control equipment in the form of a variable reference input or set point signal. They can be operated remotely with the aid of push buttons. Two push buttons are used, one for "Run-up" and the other for "Run-down". The run-up & down durations can be changed; at any instant of time, depending on the model, these two durations can be different or a fixed value.