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I bought a voltage and current cut-off relay and I have researched many videos and written sources for 1 month. There was no one who recommended a single-phase system to a three-phase system. Since it is not a known system, I researched the subject and applied it. In three-phase systems, definitely use it before leakage current, buy the one for single phase. If necessary, buy 3. When there is a problem in a three-phase system, it cuts all of them. I think the problematic system should be cut if it is problematic. Yes, I expect comments, don't forget to like. Enjoy watching.