Power Problems Defined
The following is a simple overview to the most common types of power problems and the levels of protection afforded by the different UPS technologies.
Power Problem
Standby/ Offline UPS
Line-Interactive
UPS On-Line Double
Conversion UPS
Conversion UPS
Power Failure
Yes
Yes
Yes
Power Sag
Yes
Yes
Yes
Mains Power Surge
Yes
Yes
Yes
Under-Voltage
No
Yes
Yes
Over-Voltage
No
Yes
Yes
Switching Transients
No
No
Yes
Line Noise
No
No
Yes
Frequency Variations
No
No
Yes
Harmonic Distortion
No
No
Yes
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