Switching device of an electrical unit, comprising: - a main switch configured to be displaced between a closed position allowing a passage of electrical current in a main electrical circuit of the electrical unit and an open position 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 to the open position, 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 allowing a passage of electrical current in a main electrical circuit of the electrical unit and an open position 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 to the open position, 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.