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  • Electric power systems designed to provide independent continuous electric power during a limited period of time (typically minutes or a few hours), without delay or transients, when the line power supply has complete blackouts or does not perform acceptably (e.g., momentary fluctuations or interruptions). These power systems are usually connected to the power input line; they include a battery charger, a battery, an inverter, and a transfer device (e.g., a static switch). Uninterruptible power systems are used when a continuous supply of electric energy is needed (e.g., for computerized devices) without the temporary interruptions that usually occur when using the standard emergency or standby power supplies.
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