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How a UPS works

A UPS is designed to bridge a varying number of malfunctions in accordance with its protection class (3-5-9). Depending on the application, a UPS can utilise one of the following technologies.

It can protect your components from power outages, over- and undervoltage, voltage fluctuations, frequency interference, voltage distortions, spikes, transients, and high harmonics.

Offline/standby UPS VDF protection class 3 (VDF: voltage + frequency dependent)
Protection against:
1. power failure
2. brownout
3. overvoltage

Line interactive UPS VI protection class 5 (VI: voltage + independent)  
Protection against:
1. power failure
2. brownout
3. overvoltage
4. mains short circuit
5. line noise

Online UPS VFI protection class 9 (VFI: voltage + frequency independent)
Protection against:
1. power failure
2. brownout
3. overvoltage
4. mains short circuit
5. line noise
6. high peak voltages
7. frequency deviation
8. spikes
9. high harmonics