1.Suitable for mines which contains gas and coal dust explosion risk, used as electric locomotive battery 
for charging in downhole tunnel. 
2.Easily spark generating A.C. Part and control part has formed independent explosion isolated cavity, 
which makes stable operation of control part. 
3.Digital control module,high precision,stable output property. 
4.Overload and short circuit protection function. 
5.Without requirement of adjusting phase sequence,soft starting,initial charging function.