This product is either discontinued or we cannot get that from suppliers.
Cisco C6840-X-1100W-AC=, Device Type Power supply - redundant - plug-in module, Input Voltage AC 100-240 V, Power Capacity 1100 Watt, Input Voltage AC 100-240 V.
The power supplies can work together in Redundant Mode, in which each power supply operates at approximately 50 percent of its capacity, no greater than 60 percent and no less than 40 percent. If one power supply fails.