Selective earth leakage protection device for underground coal mine low-voltage power grid

The invention relates to the technical field of coal mine underground safety, in particular to a coal mine underground low-voltage power grid selective leakage protection device which comprises a protection box, an intelligent controller is connected to the side wall of the protection box, and a temperature sensor and a humidity sensor are connected to the side wall of the protection box and located on one side of the intelligent controller. The invention discloses a selective leakage protection device for an underground low-voltage power grid of a coal mine, the selective leakage protection device comprises a protection box, a transmission structure is arranged on the side wall of the protection box, a moisture-proof structure is arranged on the side wall of the protection box, and a heat dissipation structure is connected to the end face of the protection box. And through the design of heat dissipation of the heat dissipation fan, external humid air is effectively controlled to flow into the device, so that