This series of products are upgraded on the basis of YB3 series flameproof high-voltage three-phase asynchronous motors, which further reduce the total loss of the motor and meet the efficiency value of Grade 1 energy efficiency specified in GB30254-2013. It has the advantages of compact structure, light weight, high efficiency, low noise, small vibration, convenient installation and maintenance, etc. The products are mainly used in petroleum, chemical industry, coal, power station, metallurgy, transportation, textile, medicine, food processing and other explosive gas industry fans, pumps, compressors, crushers, chip machine tools, transport machinery and other general mechanical equipment or other similar mechanical equipment.