An Uninterruptible Power Supply is an electrical apparatus that provides emergency power to a load when the Input Power source, typically Mains Power fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide instantaneous protection from Input Power interruptions, by supplying energy stored in batteries.
A UPS is typically used to protect hardware such as computers, data centres, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business disruption or data loss.
UPS units range in size from units designed to protect a single computer to large units powering entire data centres or buildings.
The primary role of UPS is to provide short – term power when the Input Power source fails. However, most UPS units are also capable in varying degrees of correcting common utility power problems such as:
* Voltage spike or sustained Over Voltage
* Momentary or sustained reduction in Input Voltage
* Noise defined as a high frequency transient or oscillation, usually injected into the line by
* Instability of the Mains Frequency
* Harmonic distortion: defined as a departure from the ideal sinusoidal waveform expected on