This power supply option contains two hot-swap 1800W, 200-240V power supplies to provide both power and redundancy to your IBM eServer BladeCenter. Two 2.8 m (nine foot) IEC309 C19 to C20 rack cables are included for attachment to a supported 200-240V power distribution unit. BladeCenter supports four power modules. Two 1800W hot-swap, redundant power modules are standard and support the population of BladeCenter bays 1 through 6. This 1800W Power Supply Module is required to support installation of blade servers in BladeCenter bays 7 through 14. BladeCenter customers must use power supplies of identical wattages to ensure power redundancy and should not mix power supplies of different wattages.