This 3-phase NEMA-1 Acu Drive XS commercial variable frequency drive save up to 60 percent or more on pump's electricity usage. Saves energy with constant flow as the filters gets dirty (with optional flow sensor). Does not blow corrosive filter-room air across the circuitry. High efficiency up to 98 percent - adjusts drive input voltage for best efficiency point. Eliminates need for motor starters. Integrated disconnects, fusing and optional bypasses. 2-step ramps (soft start feature). Overload trip protection protects motor and Acu Drive from voltage spikes and phase unbalance. Can connect to an IntelliTouch system. Indoor and outdoor-rated enclosures. For use with 3 phase pumps only. The Acu Drive XS offers built-in intelligence for increased performance in all aquatic pump applications. Specified to save money, energy and time, the Acu Drive offers very fast return on investment. The Acu Drive allows the pump to run at its most efficient point on the curve. Preventative maintenance costs will drop due to motor protection, motor soft start, and a significant decrease in water hammer protecting the shaft and impeller. Up to an additional 5 percent savings due to the Acu Drive's ability to balance power phase and harmonic suppression. Built with powerful standard and optional features specifically designed for energy optimization, the Acu Drive XS is perfectly matched with the full line of Pentair water commercial pool and aquatics pumps. Includes fused disconnect, on-site start-up and battery back-up 460-Volt, 15-horsepower and comes with 6 year warranty.