Uninterruptible power supply
OverviewCommon power problemsTechnologiesOther designsForm factorsApplicationsHarmonic distortionPower factorAn uninterruptible power supply (UPS) or uninterruptible power source is a type of continual power system that provides automated backup electric power to a load when the input power source or mains power fails. A UPS differs from a traditional auxiliary/emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions by switc