Description
Un-Interruptible Power Supply (UPS) is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator because it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries.
The on-battery runtime of most un-interruptible power sources is relatively short (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment.
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