PWR-C1-1100WAC Cisco 1100W AC Power Supply PWR-C1-1100WAC The Cisco Catalyst 9300 and 3850 Series Switches support dual redundant power supplies. The switch ships with one power supply by default, and the second power supply can be purchased at the time of ordering the switch or at a later time. If only one power supply is installed, it should always be in power supply bay 1. The switch also ships with three field-replaceable fans.