Abstract: Leakage protection is a critical safeguard in low-voltage power supply systems in mines. The principles of leakage protection include the basis for leakage judgment and the selective leakage protection mechanism. The primary reasons for false trips and failures to operate in existing leakage protection systems are the trade-off between the accuracy and speed of leakage resistance detection, and the inability of a single selective leakage protection principle to cover all low-voltage leakage scenarios. Analyzes common low-voltage leakage protection principles, their applicable environments, operational blind spots, and suitability for non-coal mine low-voltage systems. It also discusses common issues in the selection and use of low-voltage leakage protection equipment in non-coal mines. The “zero-sequence voltage correction method” for detecting leakage resistance achieves high accuracy and rapid response by dynamically correcting the influence of system voltage and system capacitance on zero-sequence voltage. The “multi-principle integrated judgment intelligent switching” selective leakage protection mechanism adapts the protection principle based on system operating conditions and introduces the features and performance of the JD1000 low-voltage leakage protection device and the low-voltage leakage protection monitoring platform where it serves as the core component.