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Which control box do I need? Generally speaking, pump control boxes are selected by matching them to the horsepower, voltage, and phase of your submersible motor. Most all traditional systems are going to be single phase 230-volt applications so in most instances it comes down to matching them to the horsepower. In situations when there is overlap such as the 1hp models you can choose a QD or Standard control box. The choice usually comes down to preference. The QD box may be cheaper but the standard box will provide more room for wiring and has overload protection built in.