Uninterruptible power supply for limitation of peak load

A power supply apparatus for electrical and/or electronic user devices, comprising an uninterruptible power supply (2) which can be connected electrically to at least one primary power source (3), to at least one secondary power source (4), and to one or more electrical and/or electronic user devices (5) to which the electric power originated from the power sources (3, 4) is to be delivered, the uninterruptible power supply (2) comprising an electric current management unit for connecting electrically the primary power source (3) to the user devices (5) to deliver electric power up to a preset threshold value and to activate/deactivate the electrical connection of the secondary power source (4) to the user devices (5) to deliver remaining electric power absorbed by the user devices.