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AssigneeSiemens Aktiengesellschaft
InventorsJosef Götz, Thomas Kiendl
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A power supply is disclosed for an electronic tripping unit and, in particular a circuit breaker for low voltages, which is connected on the outgoer side to a load via whose load resistance a direct current or alternating current flows. An electronic tripping unit initiates the disconnection of the associated contact elements in the event of an overcurrent and/or short-circuit current, and a voltage tap taps off a voltage on the conductor in order to supply power to the tripping unit. In order to ensure that power is always supplied to the tripping unit, the power supply includes, in at least one embodiment, an inductance between the load and the voltage tap, which inductance is connected in the conductor and is of such a magnitude that, when the current changes over time during the course of a short circuit, the voltage which is tapped off as the voltage drop across the inductance ensures the supply of electrical power to the tripping unit at least for a minimum time.
A power supply for an electronic tripping unit for a switch, connected on an outgoer side to a load via whose load resistance, a direct current or alternating current flows, a conductor running through the switch, with contact elements resting on one another when the switch is closed and being disconnected from one another in order to open the switch, the electronic tripping unit initiating the disconnection of the contact elements when a current limit value is exceeded, a voltage tap being included to tap off a voltage on the conductor, the voltage ensuring supply of electrical power to the tripping unit as voltage drop across the load resistance, the power supply comprising:
A switch, connected on an outgoer side to a load via whose load resistance, a direct current or alternating current flows, the switch comprising:
Dependencies are inferred from the claim text.