Motorized hinge device comprising a first connection means assigned to be fixed to a structure or a framework of an appliance, and connected, at least by means of a connecting rod means, to a second connection means assigned to be fixed to a door or a shutter of the appliance, and hinged to the first connection means by means of a hinge pin means, said device comprises at least one actuator means having a body fixed to the first connection means or to a structure or a framework of the appliance, and a movable member which is movable with respect to the body, and connected to the connecting rod means, in an operative condition, the actuator means is operated to move, by means of the connecting rod means, the door or the shutter of the appliance around the hinge pin means between extreme opening and closing conditions, and vice versa, a second link pin means is engaged in a respective eyelet carried out in the movable member of the actuator means and is connected to the connecting rod means, the axis of the second link pin means is parallel to the axis of the hinge pin means; said device being characterized in that said second link pin means is connected to the connecting rod means by means of drag means or by means of detachable coupling means and the body of the actuator means is fixed to or in respect to the first connection means or the second link pin means is engaged in a respective seat hole of the connecting rod means and the body of the actuator means is connected to the first connection means or to the structure or framework of the appliance by means of said drag means or said detachable coupling means; in the operative condition said drag means or said detachable coupling means limit the maximum force transmissible from the actuator to the door preventing damages in case the door being blocked by an object or being forced; were said detachable coupling means comprise a slider which slides along an elongated seat parallel to a line of action of the actuator means or inclined of an angle smaller than 45° and provided with a resilient and detachable stop for the slider in a middle or end position of the seat; such slider is connected to the second link pin means or to the body of the actuator means and the elongated seat with the resilient stop is fixed or integral to the connecting rod means or to the first connection means or to the structure or framework of the appliance; the latter or the connecting rod means and the elongated seat are provided with respective facing slots for the free sliding of a pin connecting the body of the actuator to said first connection means or said structure or of the second link pin means; said detachable stop transmit a force, equal or smaller than a preset threshold, between slider and the elongated seat rigidly transmitting the force of the actuator to the door, when said force exceeds said threshold, the sliding block slides along the race preventing damages in case of a block of the rotation of the door; or were said drag means comprises a sliding block frictionally sliding along a race parallel to a line of action of the actuator means or inclined of an angle smaller than 45°, where such sliding block is connected to the second link pin means or to the body of the actuator means and the race is fixed to the connecting rod means or to the first connection means or to the structure or framework of the appliance; in the operative condition, the drag means rigidly transmits the force of the actuator means to the connecting rod means when said force is smaller or equal to the static friction between the sliding block and the race; when said force exceeds said static friction, the sliding block slides along the race preventing damages in case of a block of the rotation of the door.