SOURCE: hi we have problem with 6kva 9120 eaton ups,
The Poweware UPS is a true on-line UPS System, so it will handle sustained over and under voltages to +20% and -15%. If you are getting input spikes, the UPS has MOV's which will handle input spikes, and if too great a spike, the MOV will die attempting to save the UPS output load. If you are having further UPS input problems you need to put a good quality surge arrestor at the panel feeding the UPS on BOTH circuit legs feeding the UPS.
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