Switching device of an electrical unit , comprising: - a main switch configured to be displaced between a closed position (P1) allowing a passage of electrical current in a main electrical circuit of the electrical unit and an open position (P2) prohibiting the passage of electrical current in the main electrical circuit , - a vacuum interrupter comprising: -- a fixed electrode , -- a mobile electrode , configured to be displaced between: --- a first position (P1'), in which the fixed electrode and the mobile electrode are in contact, and --- a second position (P2'), in which the fixed electrode and the mobile electrode are apart from one another, - a palette mechanically linked to the mobile electrode , configured to make the mobile electrode switch over from the first position (P1') to the second position (P2'), the palette comprising an electrical conductive plate , the main switch being configured to drive the palette via the plate in the switchover from the closed position (P1) to the open position (P2), characterized by -- a connection wire electrically linking the plate and the mobile electrode , the connection wire being in electrical contact with a connection tube disposed in an accommodating recess of the plate , wherein the accommodating recess comprises a wall exerting an elastic holding force on the connection tube . - a main switch configured to be displaced between a closed position (P1) allowing a passage of electrical current in a main electrical circuit of the electrical unit and an open position (P2) prohibiting the passage of electrical current in the main electrical circuit , - a vacuum interrupter comprising: -- a fixed electrode , -- a mobile electrode , configured to be displaced between: --- a first position (P1'), in which the fixed electrode and the mobile electrode are in contact, and --- a second position (P2'), in which the fixed electrode and the mobile electrode are apart from one another, - a palette mechanically linked to the mobile electrode , configured to make the mobile electrode switch over from the first position (P1') to the second position (P2'), -- a fixed electrode , -- a mobile electrode , configured to be displaced between: --- a first position (P1'), in which the fixed electrode and the mobile electrode are in contact, and --- a second position (P2'), in which the fixed electrode and the mobile electrode are apart from one another, --- a first position (P1'), in which the fixed electrode and the mobile electrode are in contact, and --- a second position (P2'), in which the fixed electrode and the mobile electrode are apart from one another, - a palette mechanically linked to the mobile electrode , configured to make the mobile electrode switch over from the first position (P1') to the second position (P2'), the palette comprising an electrical conductive plate , the main switch being configured to drive the palette via the plate in the switchover from the closed position (P1) to the open position (P2), characterized by -- a connection wire electrically linking the plate and the mobile electrode , the connection wire being in electrical contact with a connection tube disposed in an accommodating recess of the plate , -- a connection wire electrically linking the plate and the mobile electrode , the connection wire being in electrical contact with a connection tube disposed in an accommodating recess of the plate , wherein the accommodating recess comprises a wall exerting an elastic holding force on the connection tube . <EOS>