Answer Posted / ganesh.raj

A standby UPS or "offline UPS" draws current from the AC
outlet and switches to battery within a few milliseconds
after detecting a power failure.

The line interactive UPS "interacts" with the AC power line
to smooth out the waveforms and correct the rise and fall of
the voltage.


The "Online UPS" is the most advanced and most costly UPS.
The inverter is continuously providing clean power from the
battery, and the computer equipment is never receiving power
directly from the AC outlet. However, online units contain
cooling fans, which do make noise and may require some
location planning for the home user or small office.

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