Shutter device for a switchgear apparatus comprising stationary electric contacts and a circuit breaker having movable electric contacts (9a, 9b), the shutter device comprising: - a panel element movable between a non-protective position in which said panel element enables said movable electric contacts (9a, 9b) to couple with corresponding stationary electric contacts, and a protective position in which said panel element hinders coupling to said stationary electric contacts; - driving lever means (26, 26a, 26b) configured for driving said panel element upon a movement of said movable electric contacts (9a, 9b), wherein said driving lever means comprise a first driving lever and a second driving lever mutually parallel and each of which is pivotally connectable to a respective stationary hinge pin, so as to rotate about a rotation axis which is arranged parallel to said panel element; - cam portions provided on both said first driving lever and second driving lever, each cam portion being suitable for interacting with a respective driving pin which is fixed on said circuit breaker and is movable together with said movable electric contacts (9a, 9b), wherein each of said cam portions comprises a cam profiled slot means in which said respective driving pin is receivable, characterised in that said first driving lever and said second driving lever comprise each a connecting end which is connected at a first side edge and at a second side edge of said panel element, respectively, and wherein each of said cam profiled slot means is shaped for abutting on the respective driving pin from opposite sides thus preventing disengagement of said driving levers (26a, 26b) from the respective driving pins during functioning of said shutter device. - a panel element movable between a non-protective position in which said panel element enables said movable electric contacts (9a, 9b) to couple with corresponding stationary electric contacts, and a protective position in which said panel element hinders coupling to said stationary electric contacts; - driving lever means (26, 26a, 26b) configured for driving said panel element upon a movement of said movable electric contacts (9a, 9b), wherein said driving lever means comprise a first driving lever and a second driving lever mutually parallel and each of which is pivotally connectable to a respective stationary hinge pin, so as to rotate about a rotation axis which is arranged parallel to said panel element; - cam portions provided on both said first driving lever and second driving lever, each cam portion being suitable for interacting with a respective driving pin which is fixed on said circuit breaker and is movable together with said movable electric contacts (9a, 9b), wherein each of said cam portions comprises a cam profiled slot means in which said respective driving pin is receivable, characterised in that said first driving lever and said second driving lever comprise each a connecting end which is connected at a first side edge and at a second side edge of said panel element, respectively, and wherein each of said cam profiled slot means is shaped for abutting on the respective driving pin from opposite sides thus preventing disengagement of said driving levers (26a, 26b) from the respective driving pins during functioning of said shutter device.