Application MD1type is widely in factories, mines, harbour, warehouses, cargo storage areas and shops, essential in raising working efficiency and improving working conditions. But it strictly forbid to use in such dangerous operating as easily combustible, explosive, corrosive, heat liquid, overloading, dust, etc. Technical characteristics Model MD1 electric hoist provides two speeds; normal speed and low speed. At a low speed, it can do precise loading and unloading, mounting of sand box, maintenance of machine tools, etc. Thus, model MD1 electric hoist is more widely used than model CD1. Trinity-drive system: the electric appliance adjusts speed without contact or spark module, and fulfills converter function, including mini-speed and double-speed, which makes traveling and lifting very steady; it is equipped with such protection devices as alarm device to overloading, obliquely hanging, second protecting preventing hook clashing the top, protecting the current lacking of any phrase etc. The operation board adopts 12V safe voltage to fulfill multi-function of protection to hoist. The electric controlling can be used more than 2 million times when the voltage is 380V+5 ~10%.