The WS-CAC-3000W 3000 W power supply shares the same form factor as the 1000 W, 1300 W, 2500 W, 4000 W, and 6000 W AC-input power supplies. The 3000 W AC-input power supply needs 220 VAC to deliver 3000 W of power. When operating with 110 VAC, it delivers only 1400 W. In addition, the power supply needs 16 A, regardless of whether it is plugged into 110 VAC or 220 VAC. For Cisco 6500 Series Models: 6506, 6506-E, 6509, 6509-E, 6509-NEB, 6509-NEB-A, 6509-V-E, 6513, 6513-E.