UPS 

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Line-interactive, on-line, modular and Hybrid

UPS (uninterruptible power supply) is an electrical device that provides emergency power to the load when the mains power (input power) fails. The protection is instantaneous due to the energy stored in batteries. They are usually used in computer, datacenter, healthcare and telecommunication applications to protect the devices against power disturption. There is three general catégories of UPS : "Offline", "Line-interactive" and "On-line double conversion".

UPS