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How UPS Systems Work when The Mains Power Supply Fails

Have you ever wondered how a UPS works? Here we show you three types of uninterruptible power supply explaining how they work and for which devices we would recommend them. After viewing this interactive demo, you will see a useful summary table from which you can select the right UPS system to protect your IT applications.


Power from mains Battery charging Power from battery Static bypass (raw mains) Not carrying power
UPS Topology IEC 62040-3 Class Break When Mains Power Fails Voltage Regulation on Mains Power Typical Use
Online Double-conversion VFI 0 ms Full. Output is generated by the inverter all the time as a pure sinewave Server rooms, data centres, comms rooms, medical and industrial control
Line Interactive VI 2–4 ms typical Partial. AVR boosts or bucks voltage, frequency passes through and the inverter may be a psuedo sinewave or pure sivewave Network cabinets, Edge sever racks, small server installations
Standby (Offline) VFD 4–10 ms typical None. Load sees mains power as it arrives, after filtering Desktop PCs, home office and non-critical single devices

Please contact our Projects Team for further informtion or advice on selecting the right UPS for your application.