| 摘要 |
The invention relates to a power distribution switchgear circuit breaker applicable especially to medium or high voltage distribution board switchgears. The power distribution switchgear circuit breaker comprises at least one breaking element in the form of vacuum chamber or SF6 pole, which is provided with electric terminals, to which there are non-permanently connected the ends of contact arms, made in the form of a metal tube. The circuit breaker according to the invention is characterized in that the metal tube of the contact arms has all cross-sections perpendicular to the axis of the tube without any discontinuities along the whole length of the tube and it is located in an insulating casing which is provided with cooling elements which are located on the outer surface of the casing and which form an integral part with the casing. |
