Insulating part for a high voltage switch of a metal enclosed circuit breaker system

Abstract

An insulating part () is provided for a high voltage switch of a metal-enclosed circuit-breaker system and is executed as a pressure-gelated casting on the base of a polymeric composite material. It comprises a base-plate () with a centrally arranged large through-hole () for receiving a current terminal lead of the high voltage switch and with small through-holes () for receiving fastening screws. The insulating part further comprises two bearing blocks () for receiving a shaft of a movable contact of a contact arrangement of the switch and at least a first collar () which surrounds the large through-hole (). For reason of the execution as a pressure-gelated casting the insulating part () can be manufactured easily with low costs but with high precision. In general a finish-maching of the casting is not required. The integration of the large through-hole () and of the small through-holes () as well as of the two bearing blocks () and the first collar () into the insulating part () during pressure gelation of the polymeric composite material result in a complex design which fulfills all required mechanical, electrical and thermal functions during operation of the system.