GFLW-12/24/40.5 series of pole-mounted SF6 load-break switches are used in power distribution networks with rated voltages of 12/24/40.5kV, rated currents of 400A or 630A ,and a rated frequency of 50/60Hz,to break and close the load current and overload current of the system, it can automatically isolate the faulty sections of the power distribution line.