Each pole of the earthing switch assembly (10) includes a first and a second stationary contact (11, 12) cooperating respectively with a first and a second movable rectilinear contact (13, 14) extending in a longitudinal parallel direction between an open position and a closed position, said first stationary contact (11) being electrically connected to one terminal of the circuit breaker (2), said second stationary contact (12) being electrically connected to the opposite terminal of the circuit breaker (2). A common driving plate (15) made of insulating material is attached inside said vessel (1) to said first and second movable contact (13, 14) of the three poles, said plate (15) being perpendicular to the longitudinal direction of said movable contacts (13, 14). An operating mechanism includes a single operating shaft (19) extending through a tight bearing of the vessel, and having an outer end which may be actuated from outside, and an inner end connected by a cinematic transmission lever (16, 17) to said driving plate (15) so as to perform opening/closing operations of the two earthing switches at the same time.
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