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本文分析了目前煤矿井下低压防爆电机大量损坏的原因，提出了过载保护的特性曲线，考虑了断续过负荷的热积累时间．针对煤矿特点，研究设计了一种具有本质安全电路性能的综合保护装置．
This paper analyzes the reasons for the large amount of damage to the low-voltage explosion-proof motor in coal mine at present, and presents the characteristic curve of overload protection considering the heat accumulation time of intermittent overload. According to the characteristics of coal mines, a kind of integrated protection device with intrinsically safe circuit performance is researched and designed.