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An uninterrupted power supply, also uninterrupted power source, UPS or battery/flywheel backup, 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 in that it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries or a flywheel. The on-battery run-time of most uninterrupted power sources is relatively short (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment.