Method for assembling a switching apparatus for medium voltage electric systems

A method for assembling a switching apparatus for medium voltage electric systems, said switching apparatus comprising one or more electric poles, said method comprising:

• for each electric pole of said switching apparatus, providing a mounting assembly, said mounting assembly comprising:
• a support structure made of electrically insulating material;
• a vacuum interrupter comprising a first arc contact, a second arc contact and a vacuum chamber, in which said first and second arc contacts are at least partially enclosed and can be coupled or decoupled;
• a motion transmission mechanism mechanically coupled to a movable arc contact between said first and second arc contacts and including at least one lever member made of electrically insulating material pivoted on said support structure, wherein said motion transmission mechanism comprises at least one first lever member pivoted on said support structure at a first hinge axis and at least one second lever member pivoted on a movable arc contact between said first and second arc contacts at a second hinge axis;
• and
• an auxiliary contact mechanically fixed to said support structure and electrically connected to the first arc contact of said vacuum interrupter;
• providing a first semi-finished structure of said switching apparatus, wherein said first semi-finished structure comprises, for each electric pole of said switching apparatus, a first pole terminal and a first fixed contact electrically connected to said first pole terminal;
• and
• for each electric pole of said switching apparatus, installing said mounting assembly on said first semi-finished structure of said switching apparatus, wherein the installation of said mounting assembly comprises:
• mechanically fixing said support structure to one or more support components of said first semi-finished structure;
• and
• electrically connecting the second arc contact of said vacuum interrupter to the first fixed contact of said first semi-finished structure.