Uninterruptible Power Supplies

Uninterruptible power supplies (or UPS) are electrical apparatus which provides emergency power to load when the the input power or mains fail. They are not the same as standby generators as they provide near-instant protection from power interruptions by supplying energy stored in batteries, supercapacitors or flywheels. The battery time is short but is sufficient until the standby power source is activated. These machines can also correct problems like power surges or the instability of the mains supply. There are different sizes of UPS. A tower UPS is placed on the floor, desk or shelf whilst a rack-mount version is much larger. For outside they can be placed on a pole or host-mounted. One type of uninterruptible power supply is the Online. It has no power transfer switches, makes a double conversion and provides constant power. The Standby switches to battery power immediately but it is not as fast. The Line-Interactive contains an autotransformer. Uninterruptible power supplies are predominantly used to protect hardware such as computers, data centres and telecommunication equipment. Generally they are installed anywhere that disruption in the power supply could cause injuries, fatalities or serious business disruption or data loss.

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