Dc leakage current sensor applications in the national safety standards for the use of all electrical equipment, the use of standards have certain mandatory requirements, in the DC system DC leakage current sensor is an indispensable and important component for the detection of DC leakage current of the equipment, widely used in DC power transmission, power storage detection, DC screen, power supply, large-scale medical and health equipment, photovoltaic, wind power, communication base stations and other industry equipment, the first time to the equipment leakage situation feedback, the back-end leakage protection and other original will be the first time to take measures to avoid accidents. DC power transmission, power storage detection, DC panels, power supply, large medical and health equipment, photovoltaic, wind power generation, communication base stations and other industry goods equipment, the first time the equipment leakage situation for feedback, the back-end leakage protection and other originals will be the first time to take relevant measures to avoid accidents, the safe use of the production operation.