Cisco C3KX-FAN-23CFM enterprise networking (router/Catalyst switch/UCS families) Switch / Carrier Ethernet Line Card

The Cisco C3KX-FAN-23CFM is a replacement fan module rated at 23 cubic feet per minute, built for the Catalyst 3750-X and 3560-X Series switches (the “3K-X” platform generation). It fits the rear fan bay shared across the fixed 24-port and 48-port variants in both families and provides the forced-air cooling the switch’s power supplies and PoE+ circuitry depend on under sustained load. The 3750-X supports StackWise Plus stacking and the 3560-X does not, but both share the same chassis mechanicals and fan module design, so this part serves either platform. A failing fan typically shows up as a thermal alarm or reduced PoE budget well before the switch shuts down outright, and since the 3750-X/3560-X range remains common in campus access-layer deployments, keeping a genuine fan module on hand avoids an unplanned outage on an otherwise serviceable switch. Tech-Star (UK-based, shipped worldwide) stocks Cisco components to support ongoing network maintenance.