Abstract:
Discloses a vacuum-type electric circuit interrupter having its contacts formed of a porous refractory metal matrix and an alloy filling the pores of the matrix consisting essentially of copper, aluminum, and bismuth. In the alloy, the aluminum is present in a quantity of between 9 and 15 percent by weight of copperaluminum, and the bismuth is present in a quantity of less than 5 percent by weight of the total alloy.
Abstract:
A vacuum-type circuit interrupter comprising a pair of contacts relatively movable into and out of engagement, the contacts having circuit-making and -breaking regions formed of an alloy consisting essentially of copper-beryllium and bismuth, the beryllium being present in a quantity of between 2 percent and 19 percent by weight of the copper-beryllium and the bismuth being present in a quantity of less than about 5 percent by weight of the total alloy but in a sufficient quantity to inhibit contact welding.
Abstract:
Discloses a high-voltage circuit breaker comprising a control device at high potential operable to produce separation of the usual contacts of the breaker, an operator at ground potential for operating the control device, and a linkage mechanically connecting the operator and the control device. The linkage comprises a releasable coupling at a location of substantially line potential that is releasable to allow the control device to be operated independently of the operator. Latch means normally prevents coupling-release but is operable in response to predetermined electrical conditions to release the coupling and allow high-speed operation of the control device before the operator operates.