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Through active preventive maintenance measures to reduce the risk of electrical fires and protect continuity of supply and production and distribution system caused by personal electric shock and system failure, it is largely due to equipment and lines caused by leakage current. Severe leakage current, electrical equipment or lines will be burned, causing a fire. Electric fire detector continuously monitors the leakage current distribution system, and can also achieve the monitoring and control of electrical equipment for leakage monitoring, to provide solutions to prevent electrical fires