Power supply for an electronic tripping unit of a switch, in particular of a power switch for low voltages, and a switch with such a power supply

摘要

The present invention relates to a power supply for an electronic tripping unit and, in particular, a power switch for low voltages, of the cabin with a load (z) is connected, via the load resistor (r) an equally - or alternating current (i) flows, with an electronic tripping unit (a), which in the case of a via - and / or short-circuit current, the separation of the associated contact elements (k), and has a voltage tap (sa), of the for the power supply (ev) of the tripping unit (a) on the conductor (l), a voltage (u _ load) tapping. In order to ensure the power supply to the tripping unit in each case, it is proposed that the power supply (ev) between the load (z) and voltage tap (sa) has an inductance (i), which in the conductor (l) and is dimensioned such that, when changing over time in the course of a short circuit current in the form of a voltage drop across the inductance (i) tapped-off voltage (u _ is induced) at least for a given period of time, the supply of the tripping unit (a) with electrical energy ensures.