Abstract: A high voltage isolator switch of the double end break type including a central, rotatable insulator carrying a switch blade and a pair of opposed insulators bearing contact assemblies for engaging the ends of the blade. The contact assemblies include pivoted saddles mounted on cantilevered studs and detents to hold the assemblies in an open position.

Abstract: An easily visible condition indicating device to signify a lack of pressure within the envelope of an electrical interrupter of the type utilizing a pressurized-gas environment. The system includes a rotatable drum contained within a housing having an aperture through which the drum is viewed. When pressure within the interrupter drops a spring-biased bellows collapses, causing the withdrawal of stops which hold the drum in place against spring tension. This allows a biasing spring to rotate the drum so that a different portion thereof, such as a different colored segment, is viewed through the housing aperture in order to provide a visual indication of a low-pressure condition.

Abstract: An air disconnect switch incorporates a unique arrangement of an ice breaking self-polishing current transfer horn arrangement which transfers the current to a puffer-type interrupter to effect circuit interruption prior to the disconnect switch being fully opened; the puffer-type interrupter is a dielectric insulated device which has its operating mechanism disposed within the dielectric insulating medium so that the system has no fast-moving external parts and provides a direct drive with minimum maintenance of the mechanism parts. The porcelain tube serves both as the interrupter housing and as the mechanism housing.

Abstract: An air disconnect switch incorporates a unique arrangement of an ice breaking self-polishing current transfer horn arrangement which transfers the current to a puffer-type interrupter to effect circuit interruption prior to the disconnect switch being fully opened; the puffer-type interrupter is a dielectric insulated device which has its operating mechanism disposed within the dielectric insulating medium so that the system has no fast-moving external parts and provides a direct drive with minimum maintenance of the mechanism parts. The porcelain tube serves both as the interrupter housing and as the mechanism housing.

Abstract: A high voltage center break disconnect switch assembly having an integrally cast aluminum base usable as cast with provisions for shaft and gear adjustments without disassembling the switch and utilizing open stainless steel bearings.