A method and an electrical protective device against leakage of current in an apparatus (13) powered by an electric network (11, 11), in particular a sanitary appliance, comprise the measurement by means of a differential detector (16) of currents absorbed along two power supply conductors of the apparatus. Upon detecting a difference in current above a pre-established threshold (24, 25) the apparatus (13) being disconnected. A testing element (30, 31) being operatable to induce the differential detector (16) to emit a difference value (18) above said first threshold value (24), so as to test the functioning of the protective device. Upon operation of the testing element (30, 31) a timer (56) being operated which emits a signal for repetition of the test after a pre-established period of time.
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