Watchguard Firebox V200 Hardware Manual page 26

Do not run the appliance with only one power supply inserted. Leaving one
power supply slot open removes EMI shielding and changes the airflow
from the cooling fans, which could damage the board or system.
You insert the power supply modules into two horizontal slots in the
center back of the unit, and secure them with two latches each. Two
power cords are located below the power supplies to connect the power
supplies to a 100 to 240VAC (50/60Hz) power source. Power supplies are
interchangeable, and can be inserted into either slot.
The power supply modules appear as shown on the back of the appliance.
To replace a power supply module:
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16
Do not shut off power to the appliance to replace a power supply. A
power supply module can be removed while the appliance is in
operation.
If you want to shut off the power to the appliance to replace the
power supply, make sure you complete a system shutdown in CLI or
Vcontroller before shutting off the power. For information on how to
complete a system shutdown, see the Firebox Vclass User Guide.
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WatchGuard Firebox V200