How fast will my UPS respond to a power outage or blackout?
The transfer time from mains to battery power differs for different UPS topologies. In case of Off-line UPS, the transfer time is typically less than 10 milliseconds, in case of line-interactive UPS, this is typically less than 4 milliseconds and in case of Online UPS, it is zero. Thus the switchover time for all UPS topologies are quick enough (one cycle in a 50Hz environment is 20 milliseconds) so that computer workstations will mostly never notices the lapse.
Other Questions
Can you provide a comparison of the advantages and disadvantages of Off-line, Line-interactive and On-line UPS?
Can you provide a comparison of the extent of protection against power irregularities provided by Off-line, Line-interactive and On-line UPS?
When should we use a single or 3 phase UPS?
How much UPS capacity do I need?
What kind of equipments should I connect to the UPS?