Device for detecting differential currents, in particular of mixed currents of smoothed direct current and alternating currents
The device has two conductors (21) for load currents to be monitored and a magnetic current transformer, through which the conductors are guided. An oscillating circuit (22) is provided, which is designed as a square-wave generator and comprises two operational amplifiers and a current transformer (1) with two secondary windings (N13,N14). The secondary windings are electrically connected in series with an ohmic resistor. The operational amplifiers are arranged in a housing.