ELECTRICALLY INSULATED CURRENT MEASURING DEVICE, ELECTRONIC TRIGGER, AND CIRCUIT BREAKER COMPRISING SUCH A DEVICE

摘要

The invention relates to an electrically insulated current measuring device comprising a signal inlet connected to an electrical shunt (40), an output signal outlet (SO), and electrically insulated signal transfer means receiving the input signal and supplying the output signal. The transfer means comprise at least one signal transformer (14) having at least one primary winding (15) for receiving a primary signal (SP) representing the input signal, switching means (16) for chopping the input signal and supplying it to the primary winding, and means (17) for controlling the electrically insulated switching means and comprising a control inlet receiving control signals (SC) during switching periods (TC). A trigger and an electrical circuit breaker comprise such a current measuring device and a unit for processing electrical protection functions.