The Cisco 770W AC Hot Plug Power Supply AIR-PSU1-770W-RF for 5520 Controller is a Cisco hot-plug redundant - power supply plug-in module with 700 Watt power capacity that is specifically designed to work accurately with Cisco One 5520 Wireless Controller.. Product type: Power supply, Product colour: Black,Grey. Compatibility: Cisco 5520. Total power: 770 W, AC input voltage: 100 - 240 V, AC input frequency: 50 - 60 Hz