SF6 Gas Insulated Load Interrupting Switches with Fusing

This paper discusses the design and testing of an SF6 gas-insulated load interrupting switch which has multiposition capability. The multiposition capability is achieved through the use of rotary switching contacts which allow a wide variety of switching arrangements within one enclosure. In addition, the application of current limiting fusing in conjunction with SF6 insulated switches is described. This combination is achieved through the use of commercially available air-insulated canisters. The testing which was done to qualify the fuse canisters is also presented.