HP 575-Watts 100-240V AC Redundant Hot Swap Power Supply for 2920 Series PoE Switches. 575-watts power supply is a type of power supply that is rated to deliver a maximum output of 575 watts. This means that it is capable of providing up to 575 watts of electrical power to the devices that are connected to it. The power supply converts the incoming AC power from the electrical grid into DC power, which is then used to power the devices connected to it. 575-watts power supply is commonly used in a variety of applications, such as servers, switches, routers, and other network devices, as well as in industrial control systems and other equipment that requires a moderate amount of power.