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Hfuda
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A three-phase four-wire system has 380V LL, 220V LN voltages. A number of single phase 220V loads are connected between each phase and neutral. If the neural gets accidentally disconnected from the source, the 230V LN jumps to 380V LL. I am installing an overvoltage protector that can protect up to 300V. However, I am not sure what is the maximum voltage that the input terminals can accept without damage to the protector device? The specs do not provide an answer other than the fact that overvoltage setting can range from 270V to 300V. This implies that it can tolerate voltages above that. But to what level? And for how long?