Abstract: An electrical insulator assembly and method of manufacturing same, having a generally cylindrical or conical body portion formed of a breakable cast solid insulation system and a reinforcing member having a corrugated configuration and formed of a web or mesh type reinforcing fabric. When the breakable body member has been broken, the corrugated configured reinforcing web member provides a path of escape for pressurized insulating fluid while limiting the movement of body member fragments in the direction of escape of the pressurized fluid.

Abstract: A circuit interrupter includes a pair of separable contacts, an operating mechanism for causing separation of the contacts, and a drive mechanism for causing movement of the operating mechanism. The drive mechanism includes a pressure generating propellant charge in communication with an operating cylinder which contains a piston and a piston rod, which piston rod is operatively connected to the operating mechanism. Either or both the propellant charge and the operating cylinder are preselected from a plurality of similar and interchangeable components which have different amounts of effective charge or cross-sectional interior areas respectively, to thereby modify the performance characteristics of the operating mechanism.