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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
Power FailureYesYesYes
Power SagYesYesYes
Mains Power SurgeYesYesYes
Under-VoltageNoYesYes
Over-VoltageNoYesYes
Switching TransientsNoNoYes
Line NoiseNoNoYes
Frequency VariationsNoNoYes
Harmonic DistortionNoNoYes

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