Which is better to put: three single-phase voltage relays or one three-phase?
Good afternoon. They put a voltage control relay 1SVR550870R9400 and a contactor AF38-30-00-13. They said that the relay controls, the contactor turns off. So last night the relay worked and disconnected all three phases. As a result, without light for about 30 minutes, then it turned on automatically.
Question. Isn't it better to put a relay on each phase so that at least not everything is cut down? Can you do that? Or in the event of a zero break, all phases are still disconnected, and one phase is disabled only if there is a bias? What's better is my circuit or put on each phase for example 1-f 40A 50-400V DIN rail DIGITOP VA-40A.
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Hello! Well, you can do as you described, only for this you can use 3 single-phase relays. But usually the voltage in the phases rises and rises symmetrically.
The phase imbalance does not happen so often, so your alteration, in principle, is in question. If the voltage rises or decreases symmetrically in the three phases, it will turn off the three phases anyway.