UNINTERRUPTIBLE POWER SUPPLY Jump to naviga A large datacenter-scale UPS being installed by electricians An uninterruptible power supply or uninterruptible power source ( UPS ) is an electrical apparatus that provides emergency power to a load when the input power source or mains power fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries, supercapacitors , or flywheels . The on-battery run-time of most uninterruptible power sources is relatively short (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment. It is a type of continual power system . A UPS is typically used to protect hardware such as computers , data centers , t...
