Types of Uninterruptible Power Supplies | Did You Know?

The three most common types of Uninterruptible Power Supplies are:

  • online double-conversion,
  • line-interactive, and
  • offline/standby.


In an online double-conversion UPS, the batteries are always connected to the inverter, so no power transfer switches are necessary.

Double-conversion UPSs are the safest, but most expensive kind of power protection.

The line-interactive UPS is similar in operation to a standby UPS, but with the addition of a variable voltage autotransformer.

The offline/standby UPS (SPS) offers only the most basic features, providing surge protection and battery backup.

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