Exemplary embodiments are directed to a bistable magnetic actuator for a medium voltage circuit breaker arrangement, including at least one electrical coil for switching a ferromagnetic armature between a first limit position and a second limit position effected by an electromagnetic field, at least one permanent magnet for holding the armature in one of the two limit positions corresponding to an open and a closed electrical switching position respectively of the mechanically connected circuit breaker. The armature includes an upper plunger resting on a ferromagnetic core element of the one electrical coil for static holding the armature in the first limit position, which is attached to a plunger rod extending through the ferromagnetic core element and through the permanent magnet for mechanically coupling the actuator to the circuit breaker arrangement.