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UPS systems will generally include some form of automatic mainsfailuredetection(AMF) and an automated changeover process.

The universal power supplies UPS may also detect power restoration and automatically revert to the mains supply.

If continued power supplyis critical, the UPS system may be provided by a number of smaller packaged units,rather than by a single source,

which might introduce a potential source of failure itself.

The packaged units might include some ‘redundancy’ so that if one or more of the units fail,there is still adequate supply.

UPS require careful design, particularly where they are supplying critical systems. Regular maintenance isnecessary to ensure continued performance.

UPS can be also be useful when the primary power source is shut down intentionally,for example during maintenance,

and some systems can correct power supply issues such as voltage spikes.

A UPS is not the same as an auxiliary,standby or emergency power supply as it provides virtually instantaneous supply, avoiding any power interruption.

Generally this will include the use of batteries,super capacitors, or fly wheels (UPS system supplies) that either allow equipment to be powered down safely when the mains supply is interrupted, or provide power for long enough for an auxiliary supply to come online.