Three-phase voltage relays
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— three-phase 400 V power supply is used mainly for high consumption devices for which 230 V do not provide enough power. Also note that electrical panel in private houses are often connected to a three-phase mains, with further power distribution for individual phases. However, in such cases, it is more reasonable to use three separate relays for each of the phases, and not one three-phase device: in the first case, only part of the home system will lose power in the event of a power failure, in the second, the entire system.