Well pump control boxes are used with 3-wire well pumps. Deep well control boxes contain the starting circuits for the pumps--the starting components for the well's motor. These control boxes are mounted on a wall above ground, outside of the well. The benefit of using a 3-wire well pump with a well pump control box is that if any component fails, the parts are easily accessible and replaceable without removal of the pump itself from the well. This can lead to cheaper maintenance costs for your deep well submersible pump.
