Actuator for actuating a hydraulic clutch actuator , having: an electric motor , an actuating disc which is driven rotationally about an axis by the electric motor , a slotted guide structure which is coupled to the actuating disc , and an actuating rod , the slotted guide structure forming a pressing face , the radius (r) of which increases, in particular continuously, in relation to the axis from a point of minimum radius in an actuating circulating direction about the axis towards a point of maximum radius, the actuating rod being in engagement at its one end with the clutch actuator , the actuating rod being guided and supported on the slotted guide structure in such a way that, in the case of a rotation of the actuating disc in the actuating circulating direction , a pressure is exerted on the actuating rod by the slotted guide structure , characterized in that a holding structure is configured on the slotted guide structure , close to the point of maximum radius, which holding structure is configured in such a way that, on account of an action of the holding structure , the actuating rod remains in a position, in which it is disengaged substantially at a maximum with respect to the clutch actuator , the holding structure being configured as a region with a constant radius (r), in the case of which the actuating rod is not adjusted axially in the case of a further rotation of the actuating disc beyond the point of maximum radius (r), or the holding structure being configured as a planar, straight face of the slotted guide structure , in the case of which the actuating rod is adjusted axially towards the axis in the case of a further rotation of the actuating disc beyond the point of maximum radius. an electric motor , an actuating disc which is driven rotationally about an axis by the electric motor , a slotted guide structure which is coupled to the actuating disc , and an actuating rod , the slotted guide structure forming a pressing face , the radius (r) of which increases, in particular continuously, in relation to the axis from a point of minimum radius in an actuating circulating direction about the axis towards a point of maximum radius, the actuating rod being in engagement at its one end with the clutch actuator , the actuating rod being guided and supported on the slotted guide structure in such a way that, in the case of a rotation of the actuating disc in the actuating circulating direction , a pressure is exerted on the actuating rod by the slotted guide structure , characterized in that a holding structure is configured on the slotted guide structure , close to the point of maximum radius, which holding structure is configured in such a way that, on account of an action of the holding structure , the actuating rod remains in a position, in which it is disengaged substantially at a maximum with respect to the clutch actuator , the holding structure being configured as a region with a constant radius (r), in the case of which the actuating rod is not adjusted axially in the case of a further rotation of the actuating disc beyond the point of maximum radius (r), or the holding structure being configured as a planar, straight face of the slotted guide structure , in the case of which the actuating rod is adjusted axially towards the axis in the case of a further rotation of the actuating disc beyond the point of maximum radius. <EOS>