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Over-current protection relay - NA21 - THYTRONIC

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Over-current protection relay - NA21 - THYTRONIC

na21211 Followers, 3 Following, 0 Posts - See photos and videos from るな (@ru.na2121)The relay type NA21 is typically used in HV, MV and LV radial networks as feeder or power transformer protection. In solidly grounded systems the residual

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