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Want to protect your new POS System from power surges?
Surge protector or uninterruptible power supply (UPS)?
UPS they provide a back-up power supply for a limited amount of time in case of a blackout. This means if the power fails you have a bit of time to save your work on your computer and shut it down normally. Some UPS units also smooth out fluctuations in your power supply, helping to protect your equipment in the longer term.
There are three types of UPS
Line interactive These tend to be the better option, but often cost more. In addition to battery backup, they also regulate power to an acceptable level to smooth out the power supply in the event of minor power sags.
Standby (also called offline) These remain in standby mode until the power supply fails, then the battery takes over. They are generally the cheapest of the three types, but don't provide line conditioning.
Online or double-conversion These are generally only used industrially.