An actuator system for actuating a current interrupter having a fixed contact and moveable contact, the actuator system comprising: a transmission link for transmission of a force to the moveable contact of the current interrupter, the transmission link having a first end which is mechanically connectable to the moveable contact of the current interrupter and a second end facing away from the moveable contact; and a damping system comprising a shock-absorbing mass, the shock-absorbing mass being located along an extension of a line of translational movement of the transmission link, at the farther side of the transmission link as seen from the current interrupter, so that upon an opening operation of the current interrupter, the second end of the transmission link will collide with the shock-absorbing mass, characterized in that the transmission link comprises a shock-mitigation spring arranged to mitigate the shock experienced by the moveable contact in a damping action, the shock mitigation spring being arranged to provide elasticity to the transmission link in the direction of translational movement of the moveable contact, and the spring constant k 400 of the shock-mitigation spring fulfills the following relation: k 400 = M 1 M 2 M 1 + M 2 2 π 2 τ 2, where M1 is the mass of the part of the transmission link which is further away from the moveable contact than is the shock-mitigation spring; M2 is sum of the mass of the moveable contact and the part of the transmission link that is closer to the moveable contact than is the shock-mitigation spring; and τ takes a value between 0.1T open and 0.7T open where T open is the opening time of the current interrupter. a transmission link for transmission of a force to the moveable contact of the current interrupter, the transmission link having a first end which is mechanically connectable to the moveable contact of the current interrupter and a second end facing away from the moveable contact; and a damping system comprising a shock-absorbing mass, the shock-absorbing mass being located along an extension of a line of translational movement of the transmission link, at the farther side of the transmission link as seen from the current interrupter, so that upon an opening operation of the current interrupter, the second end of the transmission link will collide with the shock-absorbing mass, characterized in that the transmission link comprises a shock-mitigation spring arranged to mitigate the shock experienced by the moveable contact in a damping action, the shock mitigation spring being arranged to provide elasticity to the transmission link in the direction of translational movement of the moveable contact, and the spring constant k 400 of the shock-mitigation spring fulfills the following relation: k 400 = M 1 M 2 M 1 + M 2 2 π 2 τ 2, where M1 is the mass of the part of the transmission link which is further away from the moveable contact than is the shock-mitigation spring; M2 is sum of the mass of the moveable contact and the part of the transmission link that is closer to the moveable contact than is the shock-mitigation spring; and τ takes a value between 0.1T open and 0.7T open where T open is the opening time of the current interrupter.