The Cisco Catalyst 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. More information: Features | Product type | Power supply |  | Product colour | Grey | | Power protection features | Short circuit | | Heat dissipation | 2188 BTU/h | Weight & dimensions | Width | 95 mm | | Depth | 298 mm | | Height | 40 mm | Power | Total power | 640 W | | Power requirements | -36 - -72 VDC |
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