Switching device (SG) for a low-voltage circuit having a plurality of conductors, - comprising a housing (GEH) with connection contacts (AK1, ..., AK6) which are arranged on the housing and have the purpose of connecting conductors (L1, L2, L3) of the low-voltage circuit, - comprising a mechanical unit (M) which is located in the housing, has an isolating function, an OFF or ON position and isolating contacts (K1, K2, K3) for galvanically interrupting the conductors (L1, L2, L3) of the low-voltage circuit, wherein an electronic unit (E) is provided which is connected to the mechanical unit (M) in series on the current flow side, an auxiliary switch (A) is provided which is connected to the mechanical unit (M) and is in turn connected to the electronic unit (E), the auxiliary switch (A) and the electronic unit (E) are configured in such a way that during an opening process of the mechanical unit (M) the electronic unit (E) has high impedance, characterized in that the auxiliary switch (A) is mechanically connected to the mechanical unit (M), in that before the opening of the contacts (K) an electrical contact of the auxiliary switch (A) opens so that an electrical auxiliary circuit which is connected to the electronic unit (E) and has the auxiliary switch is opened, so that the electronic unit (E) subsequently reduces the electrical current of the conductors (L1, L2, L3) of the low-voltage circuit. - comprising a housing (GEH) with connection contacts (AK1, ..., AK6) which are arranged on the housing and have the purpose of connecting conductors (L1, L2, L3) of the low-voltage circuit, - comprising a mechanical unit (M) which is located in the housing, has an isolating function, an OFF or ON position and isolating contacts (K1, K2, K3) for galvanically interrupting the conductors (L1, L2, L3) of the low-voltage circuit, wherein an electronic unit (E) is provided which is connected to the mechanical unit (M) in series on the current flow side, an auxiliary switch (A) is provided which is connected to the mechanical unit (M) and is in turn connected to the electronic unit (E), the auxiliary switch (A) and the electronic unit (E) are configured in such a way that during an opening process of the mechanical unit (M) the electronic unit (E) has high impedance, characterized in that the auxiliary switch (A) is mechanically connected to the mechanical unit (M), in that before the opening of the contacts (K) an electrical contact of the auxiliary switch (A) opens so that an electrical auxiliary circuit which is connected to the electronic unit (E) and has the auxiliary switch is opened, so that the electronic unit (E) subsequently reduces the electrical current of the conductors (L1, L2, L3) of the low-voltage circuit. wherein an electronic unit (E) is provided which is connected to the mechanical unit (M) in series on the current flow side, an auxiliary switch (A) is provided which is connected to the mechanical unit (M) and is in turn connected to the electronic unit (E), the auxiliary switch (A) and the electronic unit (E) are configured in such a way that during an opening process of the mechanical unit (M) the electronic unit (E) has high impedance, characterized in that the auxiliary switch (A) is mechanically connected to the mechanical unit (M), in that before the opening of the contacts (K) an electrical contact of the auxiliary switch (A) opens so that an electrical auxiliary circuit which is connected to the electronic unit (E) and has the auxiliary switch is opened, so that the electronic unit (E) subsequently reduces the electrical current of the conductors (L1, L2, L3) of the low-voltage circuit. <EOS>