Replacing the Power Supplies
The power supplies are hot-removable and hot-insertable. You can remove or replace a power supply without powering down the system and disrupting routing functions.
However, you must power down the power supply before removing it from the router. When one power supply is powered down, the other power supply automatically assumes the entire electrical load for the router.
NOTE: The circuit breaker box is not hot-removable or hot-pluggable. You must power down the router to remove the circuit breaker box.
Action
To return a failed power supply, see Return the Failed Component. To replace the power supplies, see the appropriate router hardware guide.