... for steel rolling machine, crane, elevator and electric excavator ZZJ-800 motors are a kind of DC motor used for metallurgy ... & hoisting, available for steel rolling machine, crane, elevator and electric excavator etc ... Drip-proof, single pipe ventilated. IP23S, IC174. Totally enclosed, double pipes ventilated. IP23S, IC015. Drip-proof, self-ventilated. IP23S, ...