Provides power to a system for several hours if the power fails.
A device which provides back-up power in the event of failure in the primary power supply system. If there is a power-cut or drop-out the UPS will keep the system running for a finite period of time, allowing the primary power supply to be repaired and/or the system to be powered-off gracefully. This protects the equipment and the stored data.
A power supply containing a battery which can sustain power during power failures. A computer can usually be kept running from 5 to 15 minutes with a UPS, allowing one to save files and shut down the computer properly.