This series of flame proof three phase induction motor works by fan-coole d with inn-circulated ventilation. It features high efficiency, superior performance, and rational structure of explosive-safe. The junction box is made of hign strength cast iron, the performance conforming to China National Standared GB3836< Electrical Apparatus for Explosive Gas Atmosphere >. The Ex-marking is " Exdl". This series of products are suitable for the non-mining working area in underground or where there the explosive gas mixture in factories.