a pressurized gas - insulated circuit breaker includes a substantially tubular encapsulating housing having ends , a plurality of circuit breaker poles in phases , at least one of which is disposed in the encapsulating housing , and current feed lines . each line leading to a respective one of the circuit breaker poles . current discharge lines each lead from a respective one of the circuit breaker poles . the current feed and discharge lines to and from each respective circuit breaker pole being disposed at the same one of the ends of the encapsulating housing . supplemental conductors are each disposed in the encapsulating housing and are each extending parallel to and forming a u - shape with a respective one of the circuit breaker poles .