What device prevents power interruptions, resulting in corrupted data?

Battery back-up unit

Battery back up unit, its also called the UPS Uninterruptable Power Supply

Uninteruptable Power Source (UPS) is used to prevent power interuptions.

Uninteruptable Power Source (UPS) is the solution for this problems, and it has been used widely in every aspect of critical power for business continuity, including telecommunication network, ITC network, data center for data storage etc.

UPS gives solution all-in-one for power continuity, combining both battery back-up capability and maintaining power quality at the same time.

Note that UPS usualy used as AC  source for AC loads. For power system that specialized for supplying DC loads is Rectifier System. It has the same function as UPS, but for DC source.

Well brand UPS with true sine wave for higly risk equipments like servers,switches and NAS

UPS

Battery back-up unit.

http://www.indiabix.com/computer-science/computer-hardware/035004

question19.

For detailed information study the following information paper-

http://www.apcdistributors.com/white-papers/Management%20Systems/WP-10%20Preventing%20Data%20Corruption%20in%20the%20Event%20of%20an%20Extended%20Power%20Outage.pdf