This control box is specifically designed for 5HP, 3 wire, 230V, 1 phase Goulds and Myers pumps with either CentriPro or Pentek motors. Voltage Relay for installer convenience 230 volt models – 208 volt relay, 9K479, available for low voltage applications. Start Capacitor for starting torque run Capacitors for efficiency and quite operation. Type 3R enclosure for indoor or outdoor mounting accepts up to #2 AWG wire,Multiple knockouts and two ground terminals.Higher HP models require heavy duty pressure switches.Manual reset overloads on 1½ - 5 HP models