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For those people who have important systems connected, and busy programs in a computer or other machine that can not afford unexpected shutdowns, an uninterrupted power supply can be a very good choice, since the characteristics of providing power, after a blackout, or power failure in the system, allowing to provide power for a limited time to all devices that have connected. It is a very good acquisition to improve the quality of the electrical energy that reaches the loads, filtering voltage ups and downs and eliminating harmonics of the network in case of using alternating current.