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Low voltage electrical circuit leakage fault excavation is when happen leakage faults in the electrical network, the trigger signal through to carry on the inspection, thereby fixing the fault location, and to cut off the power supply device, electric circuitry to ensure the safety and reliability of power supply network. In the research on the low voltage electrical leakage protection system on the basis of the proposed STC15F2K60S2 single chip microcomputer as control core, the selected test analog trigger signal leakage current, no less than the normal leakage current of electrical wiring and equipment a maximum of 2 times. Leakage fault test signal, the sensitivity of the preferred 30 ma, when the leakage current action rating equal to or less than 30 ma demanding action time is less than 0.1 s, when the leakage current action is more than 30 ma rating requirements is less than 0.2 s. The device is a supplement to the traditional electric leakage protection devices, according to the indirect leakage detection and leakage test results directly compared with the actual leakage location distance, the error is within 10%, meet the actual needs, to improve the protection performance of low voltage electrical leakage protection system.