Electric hoist off the fire stopper on what function, "off the fire," What does this mean？

Electric hoist off the fire stopper on what function, "off the fire," What does this mean?


Fire is meant breaking down. It is a limit switch to limit the lifting height.
Off the fire stopper is actually a limit switch, off the fire is cut off.  Wire rope hoist  ope drum loops on how much energy with an axial movement of the guide rope, is it on a hook guide rod driven rise to a certain extent so that the limit switch is turned off, cutting off the motor power lifting , to prevent accidents.

Wire rope pulling hoist 

wire rope winch, also known as rope pulling machine. Is a new, efficient, safe and durable  Hoist equipment ，  with lifting, pulling, tensioning three functions, the whole structure, reasonable design, high safety, long service life, mainly nominal weight of 800 kg , 1600 kg, 3200 kg. Especially for field use with no power source. 

Wire rope winch tight line for line construction, adjusting sag, cable and other lifting work. Collection science, nature as a whole, is a highly efficient multi-purpose manual lifting traction machine. 

Wire rope pulling hoist widely used in shipbuilding, electric power, transportation, construction, mining, telecommunications and other sectors of the equipment installation, lifting items, mechanical traction.