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.