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Keywords from Image Description:
HFIpol. Danish residual current device of type HFI with three phases and neutral HFI hjflsm fejlstrmsafbryder highly senstitive residual current device Make Felten Guillaume polet fejlstrmsafbryder HFIrel med faser og nul own Bo Krantz Simonsen at org da Released into the public domain by the author da Bo Krantz Simonsen