Most often used in servers and other high-end computers, our redundant power supplies contain multiple power supply units inside. Each power supply is capable of powering the entire computer and only one runs at a time. If one fails, the other power supply starts running to keep the computer powered up. The switch between the power supplies is seamless, so as not to interrupt the normal use of the computer.
The redundant power supply is important for servers and other highly important computers, to minimize the chance of a complete computer shutdown or failure. The cost associated with the redundant power supply is higher due to the design and functionality.