A "stand-by" or "off-line" UPS directs main utility power to your equipment as long as it's available. When the utility power fails it switches to the battery as a source of temporary power. "Line interactive" designs also power connected equipment using available utility power, except they also provide voltage regulation within a limited range in order to reduce the occurrence of battery use. An "on-line" type of UPS powers connected equipment from battery power 100% of the time. Available utility power is only used to charge the battery.

SL350 is a stand-by UPS.

KIN and SBN models are line interactive.

SCV models are on-line.