How Does A UPS Systems Work

- Apr 01, 2021-

An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically the utility mains fails.

A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide instantaneous or near-instantaneous protection from input power interruptions by means of one or more attached batteries and associated electronic circuitry for low power users, and or by means of generators and flywheels for high power users. The on-battery runtime of most uninterruptible power sources is relatively short from 5 to 15 minutes being typical for smaller units—but sufficient to allow time to bring an auxiliary power source online, or to properly shut down the protected equipment.

While not limited to protecting any particular type of equipment, a UPS is typically used to protect computers, data centres, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business disruption and/or data loss. UPS units range in size from units designed to protect a single computer without a video monitor (around 200 VA rating) to large units powering entire data centres (>1MVA), buildings (>300kVA), or manufacturing processes.


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