Patent ID: 8614867
Filing Date: 2013-12-24
Classification: H01H,H02H

Abstract:
1. 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 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, the power supply comprising: an inductance connected in series with the load, the inductance being of such a magnitude that, when the direct current changes over time during the course of a short circuit, the voltage on the conductor which is tapped off as the voltage drops across the inductance and the load ensures the supply of electrical power to the tripping unit for a minimum time.