FLN-35D and FLRN-35D indoor SF6 load switches and indoor SF6 load switch fuse combination devices are suitable for three-phase AC 50/60HZ ring network or terminal power supply power stations and industrial power equipment, as power system load control line protection, load switch disconnection and connection load current, closed loop current, no-load transformer and cable charging current; combination devices can disconnect any current under rated short-circuit current, suitable for ring network stations, box-type substations and other electrical complete sets.