Electrical apparatus for breaking an electric current in air comprising an improved extinguishing gas filtering device

An electrical apparatus for breaking an electric current, comprising:

• two separable electrical contacts connected to terminals for an input and output of the electric current;
• an electrical arc-extinguishing chamber for extinguishing an electrical arc formed on a separation of the electric contacts, wherein said arc-extinguishing chamber is provided with an extinguishing gas exhaust orifice;
• and
• an extinguishing gas filtration system placed at an output of the exhaust orifice and comprising a filter and a gas diffuser of electrically insulating material construction, wherein the gas diffuser is interposed between the exhaust orifice and the filter;
• wherein the gas diffuser comprises, superposed between them, a central layer and two outer layers arranged on either side of the central layer, the central layer being provided with first through holes, each outer layer being provided with second through holes, the first holes being misaligned relative to the second holes, so that each of the second holes emerges on a solid portion of the central layer without any first hole.