Electrical fuse, method of operating an electrical fuse and electrical traction network

An electrical circuit breaker, comprising:

• an electro-pyrotechnic igniter;
• a movable severing element movable by the electro-pyrotechnic igniter;
• and
• a current rail having a separation section,
• wherein the movable severing element is arranged in relation to the electro-pyrotechnic igniter and the separation section of the current rail so that, after the electro-pyrotechnic igniter is triggered, the movable severing element is set in motion and severs the current rail in the separation section, and
• wherein the electrical circuit breaker further comprises at least one trigger configured to couple to the current rail to directly provide an ignition current necessary for triggering the electro-pyrotechnic igniter based on a current supplied by at least one section of the current rail or based on a temporal change in the current in response to the current supplied on the at least one section of the current rail or the temporal change of the current exceeding a limit value, wherein the at least one trigger comprises a coupling element, wherein a capacitance that corresponds to the coupling element is defined so the coupling element provides the necessary ignition current by a capacitive coupling with at least one section of the current rail.

An electrical circuit breaker, comprising:

• an electro-pyrotechnic igniter;
• a movable severing element movable by the electro-pyrotechnic igniter;
• and
• a current rail having a separation section,
• wherein the movable severing element is arranged in relation to the electro-pyrotechnic igniter and the separation section of the current rail so that, after the electro-pyrotechnic igniter is triggered, the movable severing element is set in motion and severs the current rail in the separation section, and
• wherein the electrical circuit breaker further comprises at least one trigger configured to couple to the current rail to directly provide an ignition current necessary for triggering the electro-pyrotechnic igniter based on a current supplied by at least one section of the current rail or based on a temporal change in the current in response to the current supplied on the at least one section of the current rail or the temporal change of the current exceeding a limit value, wherein the at least one trigger comprises a PTC thermistor, wherein the PTC thermistor is dimensioned and arranged in or on the current rail so a voltage that is dropping across the PTC thermistor and is produced as a result of the current that is flowing through the PTC thermistor provides the necessary ignition current.

A method for operating an electrical circuit breaker, the method comprising:

• providing an ignition current for an electro-pyrotechnic igniter;
• triggering the electro-pyrotechnic igniter;
• moving a movable severing element by the triggered electro-pyrotechnic igniter;
• and
• severing a separation section of a current rail by the movable severing element,
• wherein the ignition current necessary for triggering the electro-pyrotechnic igniter is directly provided by coupling at least one trigger to the current rail based on a current supplied on at least one section of the current rail or based on a temporal change in the current in response to the current that is supplied on the at least one section of the current rail or the temporal change of the current exceeding a limit value, wherein the at least one trigger comprises an induction loop, wherein the inductance of the induction loop is defined so the induction loop provides the necessary ignition current by an inductive coupling with at least one section of the current rail.

An electrical traction supply system in a motor vehicle, the electrical traction supply system comprising:

• a high voltage supply source;
• an electric motor;
• and
• at least one additional high voltage component,
• wherein the electric motor is connected to the high voltage supply source by master cables and the at least one additional high voltage component is connected to the high voltage supply source by auxiliary cables,
• wherein the master cables and the auxiliary cables respectively include an electrical circuit breaker that includes an electro-pyrotechnic igniter, a movable severing element movable by the electro-pyrotechnic igniter, and a current rail having a separation section, wherein the movable severing element is arranged in relation to the electro-pyrotechnic igniter and the separation section of the current rail so that, after the electro-pyrotechnic igniter is triggered, the movable severing element is set in motion and severs the current rail in the separation section, and wherein the electrical circuit breaker further comprises at least one trigger configured to directly provide an ignition current necessary for triggering the electro-pyrotechnic igniter based on a current supplied by at least one section of the current rail or based on a temporal change in the current in response to the current supplied on the at least one section of the current rail or the temporal change of the current exceeding a limit value, wherein the at least one trigger comprises an induction loop, wherein the inductance of the induction loop is defined so the induction loop provides the necessary ignition current by an inductive coupling with at least one section of the current rail.