WE CLAIM:
1. 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).

2. Electrical apparatus according to claim 1, the electric apparatus being:

a gas insulated switchgear (GIS) being a GIS for transmission or sub-transmission, or an integrated GIS;

a gas-insulated line;

a hybrid switchgear (gas insulated modules);

a circuit breaker being a live tank breaker, a dead tank breaker, or an interrupter unit;

a switch being a grounding or earthing switch, an isolation switch or disconnector, or a fast acting earth switch;

a transformer being an instrument or measurement transformer, a power transformer or a distribution transformer;

a gas-insulated surge arrester; or

extensions, upgrades or retrofits or a component or combinations thereof.

Electrical apparatus according to any of the preceding claims, wherein the adsorber, and preferably the zeolite, contains less than 0.25 at% of Mg, preferably less than 0.10 at% of Mg and most preferably is at least approximately devoid of Mg.

Electrical apparatus according to any of the preceding claims, wherein the adsorber, and preferably the zeolite, contains less than 0.25 at% of Ca, preferably less than 0.10 at% of Ca and most preferably is at least approximately devoid of Ca.

Electrical apparatus according to any of the preceding claims, wherein the adsorber, and preferably the zeolite, contains less than 0.25 at% of Fe, preferably less than 0.15 at% of Fe and most preferably is at least approximately devoid of Fe.

Electrical apparatus according to any of the preceding claims, wherein the organofluorine compound is perfluoroisobutyronitrile.

7. Electrical apparatus according to any of claims 1 to 6, wherein the zeolite has a pH less than 8.

8. Electrical apparatus according to any of claims 1 to 7, wherein the amount of clay contained in the zeolite is less than 3 wt-%, based on the total weight of the zeolite, and preferably the zeolite is at least approximately devoid of clay.

9. Electrical apparatus according to any of claims 1 to 8, wherein the average pore size diameter of the zeolite is in the range from 0.25 to 0.55 nm.

10. Electrical apparatus according to any of the preceding claims, wherein the insulation medium further comprises a carrier gas selected from the group of air, an air component, in particular nitrogen and/or oxygen, carbon dioxide and mixtures thereof.