An interlocking mechanism for interlocking a first and a second low voltage switching devices (200, 200'), wherein each of the switching devices (200, 200') comprises a movable contact part, a stationary contact part and, an actuating unit for operating the movable contact part in a direction and making connection or disconnection with the stationary contact part, the interlocking mechanism comprising - a first and a second housing (2, 2') connected to each other, - a first and a second sliding bar (10, 10'), wherein the first sliding bar is arranged on the first housing and connecting to the actuating unit of the first switching device, wherein the second sliding bar is arranged on the second housing and connecting to the actuating unit of the second switching device, and wherein a sliding plane is defined and has a X- and Y-axis, the Y-axis being defined in the direction of motion of the actuating unit of the switching devices (200, 200') and, wherein each of the sliding bars (10, 10') are configured to slide in the Y-axis direction of the sliding plane, - a shaft disposed between the first and the second houses (2, 2'), and - a cam configured to be rotatable about the shaft when both switching devices are in open positions, characterized in that - the shaft is disposed to be perpendicular to the sliding plane so that the shaft is perpendicular to the direction of motion of the actuating unit of the switching devices, - the cam further comprises a first and a second locking element (42, 42') for blocking the first and second sliding bar (10, 10') respectively, each of the locking elements (42, 42') protruding laterally in the X-axis direction, - each of the sliding bars (10, 10') comprises an opening (12, 12') at one end of the bar, and - the opening (12, 12') is configured for retaining the corresponding locking element (42, 42') when the corresponding switching device (200, 200') is in a closed position. - a first and a second housing (2, 2') connected to each other, - a first and a second sliding bar (10, 10'), wherein the first sliding bar is arranged on the first housing and connecting to the actuating unit of the first switching device, wherein the second sliding bar is arranged on the second housing and connecting to the actuating unit of the second switching device, and wherein a sliding plane is defined and has a X- and Y-axis, the Y-axis being defined in the direction of motion of the actuating unit of the switching devices (200, 200') and, wherein each of the sliding bars (10, 10') are configured to slide in the Y-axis direction of the sliding plane, - a shaft disposed between the first and the second houses (2, 2'), and - a cam configured to be rotatable about the shaft when both switching devices are in open positions, characterized in that - the shaft is disposed to be perpendicular to the sliding plane so that the shaft is perpendicular to the direction of motion of the actuating unit of the switching devices, - the cam further comprises a first and a second locking element (42, 42') for blocking the first and second sliding bar (10, 10') respectively, each of the locking elements (42, 42') protruding laterally in the X-axis direction, - each of the sliding bars (10, 10') comprises an opening (12, 12') at one end of the bar, and - the opening (12, 12') is configured for retaining the corresponding locking element (42, 42') when the corresponding switching device (200, 200') is in a closed position.