DIRECT-CURRENT ELECTRICITY LEAKAGE DETECTION DEVICE AND ELECTRICITY LEAKAGE DETECTION DEVICE

An object of the present invention is to provide a DC leakage detector and electric leakage detector with the ability to increase the freedom of selection of parts that form an excitation unit. An excitation unit (23) applies, to an excitation coil (22), an excitation voltage with a voltage level alternately changing between a first high voltage value (VH1) higher than a reference voltage value (Vr) and a first low voltage value (VL1) lower than the reference voltage value (Vr). The excitation unit (23) includes a comparison circuit (231) and a voltage switching circuit (232). The comparison circuit (231) outputs a comparison signal having a voltage level switching between a high level and a low level depending on whether a detection voltage (Vd) is greater than, or equal to or less than, a threshold voltage (Vth). The voltage switching circuit (232) switches the voltage level of the excitation voltage between the first high voltage value (VH1) and the first low voltage value (VL1) according to the voltage level of the comparison signal.