YB3系列隔爆型三相异步电动机（以下简称YB3电机）是我公司采用国内外先进技术，结合我国防爆电机行业和市场的实际情况设计开发的高效防爆电机基本系列，是YB2系列的更新换代产品。效率指标符合GB18613-2012《中小型三相异步电动机能效限定值及能效等级》中的“电动机节能评价值2级”的规定。

YB3 series  flameproof three-phase asynchronous motor (hereunder referred to as the YB3 motor) is our company uses advanced technology from domestic and overseas , combining the actual situation of Chinese  Explosion proof electric motor’s industry and market ,we design and development of efficient basic series, YB3 series is the upgrade of YB2 series motors.  The Efficiency indicators meet he "motor energy conservation value level 2".
 in  GB18613-2012《small and medium sized three-phase asynchronous motor limited value of energy efficiency and energy efficiency grade》
本系列电动机符合国家标准GB3836.1-2010《爆炸性环境 第1部分：设备 通用要求》和GB3836.2-2010《爆炸行环境第2部分：由隔爆外壳“d”保护的设备》的规定。同时其隔爆结构和参数的设计参照了IEC60079-1《电气设备隔爆外壳的结构和试验》和EN50018《爆炸性环境用电气设备“d”》标准。电动机制成隔爆型。防爆标准为Ex d I Mb、Ex d II AT4 Gb、Ex d II B T4 Gb、Ex d II C T4 Gb，分别适用于煤矿井下固定式设备及工厂用II A级、IIB、IIC级，温度组别为T1~T4组爆炸性气体混合物的场所。

This series motor conforms to the national standard GB3836.1 - 2010 《explosive environment Part 1: general requirements for equipment 》and GB3836.2-2010 《explosive environment part 2: the flame-proof shell" d "protection equipment》,At the same time, the flame-proof structure and parameters design with reference to the IEC60079-1 《the explosion-proof electrical equipment enclosure structure and test》and EN50018 《explosive environment with" d "electrical equipment》 standard. The motor is EX type. Explosion-proof standards are Ex d I Mb, Ex d II AT4 T4 Gb Gb, Ex d II B, Ex 2 d C T4 Gb, respectively applicable to fixed equipment in coal mine and factory level with A grade II, IIB, IIC, temperature classes for T1 ~ T4 group of sites with explosive air mixture.
本系列电动机功率等级和安装尺寸符合国际电工委员会（IEC）标准。且对应关系和YB2系列相同，因此可以与YB2电机互换。

Both of the power rating  and installation size of the motor are comply with the international electrotechnical commission (IEC) standards .And corresponding relation same as the YB2 series, so they can swap with YB2 motor.