Abstract: A device for quickly reconnecting two portions of a current carrying line after separation of the line portions through actuation of a circuit breaker includes a second circuit breaker and a serially connected switch connected in parallel with a primary circuit breaker. Closure of the switch reconnects the line portions through the second circuit breaker after actuation of the primary circuit breaker. The switch can include auxiliary contacts for supplying power to an ignition device associated with the second circuit breaker, to render the second circuit breaker operable only when the switch is closed.

Abstract: A switching arrangement located in the vicinity of and connected to an alternating current generator for disconnecting the generator under load and particularly under short-circuit current conditions includes a first switch connected to the generator and whose contacts are designed for carrying normal load current therefrom in a continuous manner. A second switch of the synchronized type whose contacts operate at high speed and are made comparatively less massive than those of the first switch is connected in parallel with the latter and is arranged to open its contacts subsequent to an opening operation of the contacts of the first switch. An ohmic resistor is connected in the current flow path through the second switch and its resistance is at most a 0.2 fold and preferably a 0.1 fold value of the sub-transient short-circuit impedance of the generator in order to facilitate the final switching out at the contacts of the second switch.