SF 6 Gas Insulated Load Interrupting Switches with Fusing

This paper discusses the design and testing of an SF 6 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 SF 6 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.