Abstract: A high voltage disconnection unit includes a fixed contact assembly having at least a first fixed main contact and a first fixed auxiliary contact, a movable contact assembly having at least a first movable main contact and a first movable auxiliary contact that rotate with respect to the first fixed main contact and first fixed auxiliary contact from a contacts closed position to a contacts open position. During an opening operation of the disconnection unit the separation of the first movable main contact from the first fixed main contact takes place before the separation of the first movable auxiliary contact from the first fixed auxiliary contact. The relative opening speed V1 between the first movable auxiliary contact and the first fixed auxiliary contact is greater than the relative opening speed V2 between the first movable main contact and the first fixed main contact.

Abstract: A high voltage disconnection unit includes a fixed contact assembly having at least a first fixed main contact and a first fixed auxiliary contact, a movable contact assembly having at least a first movable main contact and a first movable auxiliary contact that rotate with respect to the first fixed main contact and first fixed auxiliary contact from a contacts closed position to a contacts open position. During an opening operation of the disconnection unit the separation of the first movable main contact from the first fixed main contact takes place before the separation of the first movable auxiliary contact from the first fixed auxiliary contact. The relative opening speed V1 between the first movable auxiliary contact and the first fixed auxiliary contact is greater than the relative opening speed V2 between the first movable main contact and the first fixed main contact.

Abstract: A fast earthing switch device for HV applications which includes a gas-tight casing, a movable contact connectable to and unconnectable from a fixed contact. The movable contact is linearly movable between an open position and a closed position. The device further includes an operating mechanism for the movable contact and is characterized in that the operating mechanism includes an actuating spring actuating a closing operation of the movable contact from the open position to the closed position, at least a driving lever mounted on an operating shaft actuating an opening operation of the movable contact from the closed position to the open position, the driving lever also partially reloading the actuating spring during the opening operation, the operating mechanism further includes coupling means operatively coupling the driving lever to the movable contact.

Abstract: A fast earthing switch device for HV applications which includes a gas-tight casing, a movable contact connectable to and unconnectable from a fixed contact. The movable contact is linearly movable between an open position in which it is spaced apart from the fixed contact and a closed position in which it is connected to the fixed contact and vice versa. The device further includes an operating mechanism for the movable contact and is characterized in that the operating mechanism includes an actuating spring actuating a closing operation of the movable contact from the open position to the closed position, at least a driving lever mounted on an operating shaft actuating an opening operation of the movable contact from the closed position to the open position, the driving lever also partially reloading the actuating spring during the opening operation, the operating mechanism further includes coupling means operatively coupling the driving lever to the movable contact.