Low-voltage circuit breaker

A low-voltage circuit breaker, comprising:

• at least one current sensor, configured to determine a level of an electrical current through a conductor, associated with the at least one current sensor, of the low-voltage circuit breaker;
• at least one electromechanical switching device configured to connect and disconnect at least two electrical contact points, at least one of the at least two electrical contact points being a movable contact point to be movable to, in a first switching position of the movable contact point, connect the at least two electrical contact points to one another and, in a second switching position of the movable contact point, disconnect the at least two electrical contact points from one another;
• at least one electronic switching device, including a semiconductor switching element, electrically conductive in a first switching state and electrically blocking in a second switching state, the at least one electronic switching device being connected electrically in parallel with the at least one electromechanical switching device;
• an electronic trip device, connected to the at least one current sensor, the at least one electronic switching device and the at least one electromechanical switching device, the electronic switching device configured to, upon at least one of current values or current/time span limit values of the conductor being exceeded, first disconnect the at least one electromechanical switching device and then block the at least one electronic switching device, the at least one electromechanical switching device being configured as a vacuum circuit breaker, with the at least two electrical contact points in a vacuum, wherein a piezoelectric actuator is provided for changing a switching position;
• and
• at least one electromechanical disconnecting device electrically connected in series with a parallel circuit including a vacuum circuit breaker and the at least one electronic switching device, wherein the at least one electromechanical disconnecting device is connected to the electronic trip device, and, upon at least one of current values or current/time span limit values of the conductor being exceeded, first disconnection of the vacuum circuit breaker takes place, then blocking of the at least one electronic switching device takes place, and then disconnection of the at least one electromechanical disconnecting device takes place, wherein the semiconductor switching element is an IGBT component based on silicon.