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| Keywords: HFI-4-pol.jpg Danish residual current device of type HFI with three phases and neutral HFI højfølsøm fejlstrømsafbryder - highly senstitive residual current device Make Felten Guillaume 4-polet fejlstrømsafbryder HFI-relæ med 3 faser og nul own 2007-12-10 Bo Krantz Simonsen at http //da wikipedia org da wikipedia Released into the public domain by the author da wikipedia Bo Krantz Simonsen original upload log page da wikipedia HFI-4-pol jpg 2007-12-10 01 14 Bo Krantz Simonsen 225×231× 44966 bytes <nowiki>4-polet HFI-relæ</nowiki> Residual current devices for DIN rail | ||||
