Residual current device (1) comprising a differential current transformer (12) having a primary winding (18) comprising at least one phase conductor (3, 3 ', 3' ') and a neutral conductor (4) and a core (21), a secondary winding ( 19) and a test winding (20), with which the differential current transformer (12) can be acted upon by a test current to simulate a defined differential current, the residual current device (1) further comprising a control unit (11) to the test winding (20). for controlling the test current and for measuring a secondary voltage induced in the secondary winding (19) and / or a secondary current resulting from the induced secondary voltage, characterized in that the control unit (11) for calibrating the residual current protective device (1) is designed such that in the case of a deviation of the measured voltage value of the secondary voltage caused by the test current from a voltage In the case of a deviation of the measured current value of the secondary current caused by the test current from a current setpoint, a correction factor is calculated with which the measured voltage values of the secondary voltage caused by differential currents and / or measured current values of the secondary current caused by differential currents are multiplied.
展开▼
