A removable electric current switching element includes a housing including a first bottom plate and a second bottom plate opposite to one another. The housing includes insulating walls which extend around electrically mobile contacts from the second bottom plate and in a direction perpendicular to the second bottom plate. The housing also includes protection walls which at least partially cover internal faces of the insulating walls, these protection walls being formed of a single piece with the second bottom plate.

A roller electric contact comprises a roller comprising a shaft and a plurality of conductive discs electrically separated by an insulating material. The shaft extends through a rotational axis of the roller. A housing comprises slots in which the shaft of the roller is positioned, the slots configured to direct a non-rotational movement of the roller. A plurality of leaf springs are disposed in the housing. The leaf springs comprise an electrically conductive material. The plurality of conductive discs are spaced on the roller so that at least one of the conductive discs contact each of the plurality of leaf springs. A plurality of conductive wires extend from the roller electric contact, each of the plurality of conductive wires making electrical contact with one of the leaf springs.

A removable electric current switching element includes a housing including a first bottom plate and a second bottom plate opposite to one another. The housing includes insulating walls which extend around electrically mobile contacts from the second bottom plate and in a direction perpendicular to the second bottom plate. The housing also includes protection walls which at least partially cover internal faces of the insulating walls, these protection walls being formed of a single piece with the second bottom plate.

A switching device for a medium-voltage electrical circuit including: a frame; a vacuum circuit breaker including a fixed electrode relative to the frame and a mobile electrode; an elastic member; and an actuating lever connected to the mobile electrode via the elastic member, The actuating lever is movable between an open position in which the electrodes are separated by an open distance, and a closed position in which the electrodes are in contact. A passage of the actuating lever from the open position to the closed position defines a displacement stroke, greater than the open distance such that the elastic member is compressed when the actuating lever passes from the first position to the second position. The switching device includes at least one removable spacer arranged between the frame and the fixed electrode.

An exemplary electric switch mounting arrangement includes a housing and a stationary contact to be mounted to an aperture in a wall of the housing. The arrangement having a compensation component within the interior area of the aperture for allowing stationary contacts of two different sizes to be mounted to the aperture, which compensation component includes one or more projections formed on the housing or the stationary contact and/or one or more recesses formed on the housing or stationary contact for receiving the one or more projections.