A low-voltage circuit breaker device includes: at least one outer conductor path from an outer conductor supply terminal of the low-voltage circuit breaker device to an outer conductor load terminal of the low-voltage circuit breaker device; a neutral conductor path from a neutral conductor terminal of the low-voltage circuit breaker device to a neutral conductor load terminal of the low-voltage circuit breaker device; a mechanical by-pass switch arranged in the outer conductor path; a semiconductor circuit arrangement of the low-voltage circuit breaker device connected in parallel to the bypass switch; an electronic control unit; and a current measurement arrangement arranged in the outer conductor path and connected to the electronic control unit. The electronic control unit actuates the mechanical by-pass switch and the first semiconductor circuit arrangement upon detection of a predefined overload current, namely a short-circuit current, by the current measurement arrangement.