Switch having an electronic trip unit

Abstract

A switch having an electronic trip unit and a power supply circuit for supplying energy to the electronic trip unit from a monitored circuit is provided. In the switch, the power supply circuit is formed by a linear regulator and a switching regulator. In this case, the linear regulator and the switching regulator are connected in parallel. The switching regulator has a Power Good output and the linear regulator has a Disable input, which are connected to one other. This arrangement requires little effort and, when a power supply is established, results in the output voltage being provided quickly by the linear regulator and the latter is then deactivated via the Disable input when the switching regulator, which operates with less loss, is able to provide the power supply. The switching regulator takes over the power supply automatically without any external additional elements or signalling.

Dependencies are inferred from the claim text.