An assembly for a withdrawable switching device adapted to be installed in a low voltage electrical circuit, said assembly comprising: - a supporting frame into which a switching unit of the withdrawable switching device can be inserted and from which the switching unit can be withdrawn; - at least one first connector placed at and protruding from a bottom portion of the supporting frame, said at least one first connector being adapted to be coupled with a corresponding second connector of the switching unit when the switching unit reaches a connected position into the supporting frame; - a shutter assembly comprising: - an opening for allowing the coupling between said first connector and the corresponding second connector; and - at least one cover member (102, 103) which is adapted to be moved from a cover position to an open position so as to make said opening accessible for the coupling between the first connector and the corresponding second connector; said shutter assembly being operatively mounted movable into the support frame; characterized in that: - said at least one cover member (102, 103) is adapted to be moved from the cover position to the open position by said first connector; and - said shutter assembly is adapted to operatively interact with said switching unit under insertion into the supporting frame so as to be moved towards said bottom portion for causing the movement of said at least one cover member (102, 103) from the cover position to the open position by said first connector. - a supporting frame into which a switching unit of the withdrawable switching device can be inserted and from which the switching unit can be withdrawn; - at least one first connector placed at and protruding from a bottom portion of the supporting frame, said at least one first connector being adapted to be coupled with a corresponding second connector of the switching unit when the switching unit reaches a connected position into the supporting frame; - a shutter assembly comprising: - an opening for allowing the coupling between said first connector and the corresponding second connector; and - at least one cover member (102, 103) which is adapted to be moved from a cover position to an open position so as to make said opening accessible for the coupling between the first connector and the corresponding second connector; said shutter assembly being operatively mounted movable into the support frame; - an opening for allowing the coupling between said first connector and the corresponding second connector; and - at least one cover member (102, 103) which is adapted to be moved from a cover position to an open position so as to make said opening accessible for the coupling between the first connector and the corresponding second connector; said shutter assembly being operatively mounted movable into the support frame; - said at least one cover member (102, 103) is adapted to be moved from the cover position to the open position by said first connector; and - said shutter assembly is adapted to operatively interact with said switching unit under insertion into the supporting frame so as to be moved towards said bottom portion for causing the movement of said at least one cover member (102, 103) from the cover position to the open position by said first connector.