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An Uninterruptible Power Supply (UPS) is a device
connected between the power source and a computer
to ensure that electrical supply is not interrupted.
UPS devices use batteries to keep the computer
running for a period of time after a power failure.
It is not to be confused with standby generators
which do not provide protection from a momentary
power interruption, or which may result in a momentary
power interruption when it is switched into service,
whether manually or automatically. UPS devices
usually provide protection against power surges,
brownouts and line noise as well.
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