The UPS will operate permanently in bypass mode and the inverter will only be activated when a network fault occurs. This contributes to substantially better performance of the UPS. It comes with internal batteries that can be serviced and replaced through the front panel without removing the unit from the mounting shelf. The Zigor Tiber LBT (Long Back-up Time) model, which enables the addition of extra battery modules connected in parallel according to need, is available for applications that require longer autonomy.