The single-phase 220V electric chain hoist has upper and lower travel switches. When the hook rises or drops to the travel limit, the machine will automatically cut off the power supply and the hook will stop. The 24V AC contactor sets the flashlight door voltage to 24V, a safe low voltage without harm to people. Prevent accidents caused by electric leakage caused by various factors in the flashlight door. This product can be widely used in factories, mines, docks, shops, warehouses and other places and various modern assembly lines.