HP 20-Feb manual Module. By default, power is always kept on to ensure, Redundant backup

Figure 56 Replacing the Redundant Power Supply Module

Chapter 5

Power Supply Module

	Power Supply Unit
Caution	Do not move the covered power switch located at the bottom of
	the module. By default, power is always kept on to ensure
	redundant backup.
Note	The redundant power supply module FRU comes with the entire
	module and one power supply unit. If you need an individual
	unit and not the entire module, then use the one that comes with
	the replacement module and discard the rest of the housing.

Chapter 5 Replacing the Redundant Power Supply 171