Abstract: An improved limited-travel linkage for "cracking" a gas blast valve in a circuit breaker. A projection from a portion of the circuit breaker linkage travels along an arc in interfering relationship with a spring-loaded latch on a crank. Movement in one direction engages the latch, turning the crank and cracking the valve. Arc quenching gas then flows through a conduit to the interrupter contacts to blow out the arc drawn between them.

Abstract: Drive for a high speed disconnect switch which attains both high speed closing and high speed opening and requiring one spring for both the closing and opening operation.

Abstract: A gas insulated circuit breaker is provided having a plurality of circuit interrupters disposed in a single enclosure. Each interrupter is provided with its own high pressure container located within the sealed enclosure; the high pressure container also operates as an insulating support for the associated interrupter. A single actuating rod passing through the interrupters operates the contacts and blast valves of all the interrupters simultaneously. Service means are provided for the insertion and withdrawal of the interrupters into and out of the enclosure.

Abstract: A gas insulated circuit breaker arrangement incorporating a modular interrupter structure and having a centrally disposed single opening pull-rod and stopping means for both ends of the pull-rod stroke for controlling the movement of all of the masses of the moving parts. The acceleration spring always opposes the closing force thereby insuring that the pull-rod is in tension. Compression structure is provided to resist the tension force applied by the pull-rod and also to stabilize the interrupter structure.

Abstract: A plurality of coaxial pins are cooperatively arranged to provide a pin-joint coupling for three or more interrelated components and provide the capability of removal of one component without disturbing the adjustment and operation of the other components.

Abstract: A single pull rod mechanism for actuating the contacts of each phase of a three-phase gas insulated circuit breaker arrangement utilizes acceleration springs only in relation to the second and third phases. Contact parting velocity is measured externally of the breaker thereby providing a check on the breaker operation without breaking the integrity of the gas tight tanks. An eight valve gas system utilizing an integral manifold provides for a complete circulatory arrangement for the high and low pressure gas for all three phases of the circuit breakers increasing the operating reliability of the circuit breaker while simplifying routine and major maintenance procedures.