(See Overvoltage and Spike.)Transfer Time: The time it takes to switch from AC line power to battery power.Transformer: A device used for changing AC voltage or isolating a circuit from its power source.Undervoltage: By definition, it is voltage at 90% or less of the normal level for more than one minute. (See Arrester.)Surge: A voltage increase lasting for several cycles or more. (Compare to Sine Wave.)Standby UPS: An uninterruptible power supply (UPS) that passes line power straight through to the output when conditions are stable, but switches to battery power when line voltage dropsSuppressor: A device that diverts voltage surges to an electrical ground.
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