An apparatus having: a) an internal combustion engine; b) a waste heat utilization device having a magnetic coupling and an expansion machine which is connected in terms of drive to the magnetic coupling, wherein the internal combustion engine is connected in terms of drive to the expansion machine of the waste heat utilization device via the magnetic coupling, and wherein the magnetic coupling is a radial magnetic coupling or an axial magnetic coupling and has: b1) a first rotor with multiple magnets arranged with alternating magnetic polarity; and b2) a second rotor with multiple magnets which are arranged with alternating magnetic polarity and which are situated opposite the multiple magnets of the first rotor for the purposes of magnetically coupling the second rotor to the first rotor, wherein: b3) the first rotor and the second rotor are freely rotatable relative to one another; b4) the multiple magnets of the first rotor and the multiple magnets of the second rotor are configured such that a rotary-vibration-damping torque-transmitting operating mode between the first rotor and the second rotor changes to a freewheeling operating mode between the first rotor and the second rotor if a torque to be transmitted between the first rotor and the second rotor is higher in terms of magnitude than a predetermined threshold torque; b5) the threshold torque lies in a range higher than a magnitude of a maximum dynamic operating torque of the expansion machine and lower than or equal to a magnitude of an admissible overload torque of the expansion machine, or the threshold torque corresponds in terms of magnitude to an admissible overload torque of the expansion machine; b6) during the freewheeling operating mode, the first rotor and the second rotor rotate relative to one another with a drag torque, wherein the drag torque makes it possible for the internal combustion engine to concomitantly rotate the expansion machine upon commencement of start-up in the freewheeling operating mode; b7) when a normal operating range of the expansion machine is reached, a synchronous rotational speed between the first rotor and the second rotor is reached at which the magnetic coupling changes from the freewheeling operating mode to the rotary-vibration-damping torque-transmitting operating mode, and/or, in the normal operating range of the expansion machine, the magnetic coupling is in the rotary-vibration-damping torque-transmitting operating mode; and b8) in the overload operating range of the expansion machine, the magnetic coupling changes to the freewheeling operating mode owing to the overshooting of the threshold torque. a) an internal combustion engine; b) a waste heat utilization device having a magnetic coupling and an expansion machine which is connected in terms of drive to the magnetic coupling, wherein the internal combustion engine is connected in terms of drive to the expansion machine of the waste heat utilization device via the magnetic coupling, and wherein the magnetic coupling is a radial magnetic coupling or an axial magnetic coupling and has: b1) a first rotor with multiple magnets arranged with alternating magnetic polarity; and b2) a second rotor with multiple magnets which are arranged with alternating magnetic polarity and which are situated opposite the multiple magnets of the first rotor for the purposes of magnetically coupling the second rotor to the first rotor, b1) a first rotor with multiple magnets arranged with alternating magnetic polarity; and b2) a second rotor with multiple magnets which are arranged with alternating magnetic polarity and which are situated opposite the multiple magnets of the first rotor for the purposes of magnetically coupling the second rotor to the first rotor, b3) the first rotor and the second rotor are freely rotatable relative to one another; b4) the multiple magnets of the first rotor and the multiple magnets of the second rotor are configured such that a rotary-vibration-damping torque-transmitting operating mode between the first rotor and the second rotor changes to a freewheeling operating mode between the first rotor and the second rotor if a torque to be transmitted between the first rotor and the second rotor is higher in terms of magnitude than a predetermined threshold torque; b5) the threshold torque lies in a range higher than a magnitude of a maximum dynamic operating torque of the expansion machine and lower than or equal to a magnitude of an admissible overload torque of the expansion machine, or the threshold torque corresponds in terms of magnitude to an admissible overload torque of the expansion machine; b6) during the freewheeling operating mode, the first rotor and the second rotor rotate relative to one another with a drag torque, wherein the drag torque makes it possible for the internal combustion engine to concomitantly rotate the expansion machine upon commencement of start-up in the freewheeling operating mode; b7) when a normal operating range of the expansion machine is reached, a synchronous rotational speed between the first rotor and the second rotor is reached at which the magnetic coupling changes from the freewheeling operating mode to the rotary-vibration-damping torque-transmitting operating mode, and/or, in the normal operating range of the expansion machine, the magnetic coupling is in the rotary-vibration-damping torque-transmitting operating mode; and b8) in the overload operating range of the expansion machine, the magnetic coupling changes to the freewheeling operating mode owing to the overshooting of the threshold torque.