Take Control! The Grundfos Control Box is designed for use with Grundfos and Franklin submersible motors (3-wire, single phase, through 1hp) For use with: > 4-inch SP pump Model Description: SA-SPM5 (6 models available) Horsepower Range: 1/3 - 1hp Enclosure: -Type NEMA 3R -Material & Covering - cold rolled steel with gray coloured expoxy coating -Progressive knockouts -Hinged door -Safety shields