An electrical apparatus for the generation, the transmission and/or the distribution of electrical energy comprising a housing enclosing an electrical apparatus interior space, at least a portion of the electrical apparatus interior space forming an insulation space, in which an electrical component is arranged and which contains an insulation medium surrounding the electrical component, the insulation medium containing an organofluorine compound and the electrical apparatus further comprising an adsorber comprising a zeolite for removing at least a part a contaminant and/or decomposition product resulting from arcing and/or partial discharge in the insulation space, characterized in that the zeolite contains;
- less than 0.5 at % of magnesium (Mg),
- less than 0.5 at % of calcium (Ca), and
- less than 0.5 at % of iron (Fe).