Uninterruptible Power Supply

UNINTERRUPTIBLE POWER SUPPLY (UPS). A power supply that provides automatic, instantaneous power, without delay or-transients, on the failure of normal power. It can consist of batteries or full-time operating generators. It can be designated as standby or emergency power depending on the application. Emergency installations must meet the requirements specified for emergency power. SOURCE: Department Of Energy

Back-Up Generators ensure that operations continue during a power interruption.

Backup Power Supply
Generator for emergency electric power. With internal combustion engine.