Low-voltage circuit breaker
A low-voltage circuit breaker includes: at least one external conductor section from an external conductor power terminal of the low-voltage circuit breaker to an external conductor load terminal of the low-voltage circuit breaker; a neutral conductor section from a neutral conductor terminal of the low-voltage circuit breaker to a neutral conductor load terminal of the low-voltage circuit breaker; a mechanical bypass switch arranged in the external conductor section; a semiconductor circuit arrangement switched in parallel to the bypass switch; an electronic control unit; and a first current measuring arrangement arranged in the external conductor section, the first current measuring arrangement including a first shunt, which is connected to the electronic control unit. The electronic control unit actuates the mechanical bypass switch and the semiconductor circuit arrangement upon detecting a prespecifiable overcurrent that includes a short circuit current, by the current measuring arrangement.
1. A low-voltage circuit breaker, comprising:
at least one external conductor section from an external conductor power terminal of the low-voltage circuit breaker to an external conductor load terminal of the low-voltage circuit breaker;
a neutral conductor section from a neutral conductor terminal of the low-voltage circuit breaker to a neutral conductor load terminal of the low-voltage circuit breaker; and
an electronic control unit,
wherein a mechanical bypass switch arranged in the at least one external conductor section; wherein a semiconductor circuit arrangement of the low-voltage circuit breaker is switched in parallel to the mechanical bypass switch,
wherein a first current measuring arrangement is arranged in the at least one external conductor section, the first current measuring arrangement comprising a first shunt, which is connected to the electronic control unit,
wherein the electronic control unit is configured to actuate the mechanical bypass switch and the semiconductor circuit arrangement upon detecting a prespecifiable overcurrent comprising a short circuit current, by the first current measuring arrangement,
wherein the low-voltage circuit breaker has at least a second current measuring arrangement configured to measure a first current across the mechanical bypass switch or a second current across the semiconductor circuit arrangement,
wherein the second current measuring arrangement comprises a second shunt,
wherein the second shunt along with the first shunt are arranged on a common substrate, and
wherein, in a circuit-related manner, the second current measuring arrangement is arranged in series to the semiconductor circuit arrangement and in parallel to the mechanical bypass switch.
2. The low-voltage circuit breaker according to claim 1 , wherein the first shunt is formed by a first conductor path section.
3. The low-voltage circuit breaker according to claim 1 , wherein the second shunt is formed by a second conductor path section.
4. The low-voltage circuit breaker according to claim 1 , wherein the common substrate is a direct copper bonded substrate.
5. The low-voltage circuit breaker according to claim 1 , wherein the first current measuring arrangement is arranged in series to the mechanical bypass switch and in series to the semiconductor circuit arrangement.
6. The low-voltage circuit breaker according to claim 1 , wherein in the at least one external conductor section, there is arranged, in series to the mechanical bypass switch, a first mechanical disconnect switch.
7. The low-voltage circuit breaker according to claim 6 , wherein the electronic control unit is configured to actuate the first mechanical disconnect switch.
8. The low-voltage circuit breaker according to claim 1 , wherein in the neutral conductor section, there is arranged a second mechanical disconnect switch.
9. The low-voltage circuit breaker according to claim 8 , wherein the electronic control unit is configured to actuate the second mechanical disconnect switch.
10. The low-voltage circuit breaker according to claim 1 , wherein the semiconductor circuit arrangement is arranged on the common substrate.