Single Phase uninterruptible power supplies

Single Phase UPS Products

Some smaller units can also be known as pluggable UPS. Up to 3KVA they are also known as ‘plug and play’ UPS – 3KVA UPS are the largest UPS that can be plugged into a standard 13 Amps supply.

Single phase UPS do not normally go above 20KVA because their input power requirement is sometimes impractical due to mains incomer limitations (at 15KVA a 100Amps mains supply would be required); or the cable sizing which would be required to handle the high current levels on both the input and output of the UPS.

They can be either mounted in either a 19’’ rack or be floor standing (it is important to specify which version is required); although some UPS are known as RT models. These can be configured in both rack and tower mode.

They can be as small as 300VA which would be sufficient to supply a conventional desk-top PC; up to 20KVA for a relatively small server room.
They are available in the following technologies, which denote the differing levels of voltage conditioning required;

Off-line UPS
These provide little, or no, voltage conditioning other than to provide some back-up power in the event of either: mains failure, long power sag or surge.

Line-interactive UPS
These also protect against under voltage and over voltage without going into battery mode.

On-line UPS
These are also known as ‘double conversion’ UPS and provide 100% voltage conditioning. They rectify the AC mains into a DC voltage which is connected to an inverter input to provide a good clean AC waveform for the UPS