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るな (@ru.na2121) • photos and videos

MEREK : na2121

るな (@ru.na2121) • photos and videos

na21211,264 Followers, 327 Following, 13 Posts - (@_____na2121) on : é :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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