Abstract: An electrical gas blast circuit breaker is disclosed including first and second compartments for a pressurized quenching gas. The first and second compartments are connectible with the connection actuating valve members of each compartment. The actuation of the valve members automatically provides communication between the compartments upon connection of the compartments together. Transportation covers may be provided to releasably seal the ends of the compartments after manufacture and before connection of the compartments. The valve members are preferably spring biased with each valve member urged against the spring bias during connection of the compartments.

Abstract: A gastight seal arrangement for an actuating rod that passes through a wall of a gas-filled enclosure is described. The actuating rod includes a pair of flanges that are spaced longitudinally of the rod and are positioned on opposite sides of the wall of the enclosure. Impact seals on the interior and exterior of the wall surround the actuating rod and are engaged by the respective flanges corresponding to the position of the rod. Additional seal members are provided in the interior of the wall to prevent leakage along the surface of the actuating rod.