Mechanical cut-off apparatus for a high-voltage or very high-voltage electric circuit with splitting device

A mechanical breaker apparatus for a high voltage or very high voltage electric circuit, the apparatus comprising:

• two electrodes including a first electrode and a second electrode configured to be connected electrically respectively to an upstream portion and to a downstream portion of the electric circuit, the two electrodes of the mechanical apparatus being movable relative to each other in an opening movement between at least one electrically open position and at least one electrically closed position in which the two electrodes make a nominal electrical connection of the apparatus, said nominal electric connection serving to pass a nominal electric current through the apparatus;
• an electric arc splitter device having a multitude of distinct conductive elements that, for at least one active state of the splitter device, are spaced apart and electrically insulated from one another so as to define, in a surrounding insulating fluid, a multitude of successive distinct individual free paths in which electric arcs can be struck on opening and/or closing the electric circuit;
• and
• a sealed enclosure containing an insulating fluid in which the two electrodes are arranged,
• wherein at least some of the distinct conductive elements of the splitter device are housed in an internal cavity arranged in the first electrode or the second electrode.