PURPOSE: To make it possible to generate a magnetic field to drive the arc in the circumferential direction of a common axis of both contact makers without making the structure of the breaker complex or the size of the apparatus in a large size by burying in a permanent magnet near the arc generating point of at least either a rod-form contact maker or a tulip-form contact maker.
CONSTITUTION: A permanent magnet 52 is buried in at the top of a rod-form contact maker 51 which composes a fixed electrode of a buffer type gas breaker, that is, a permanent magnet 52 made by covering the whole outer surface formed in a short column with an adiabatic material such as ethylene tetrafluoride resin 53, for example, is buried in the contact 51b of the rod-form contact maker 51, and pressed and held to the top side of the contact through a spring 54. By burying in the permanent magnet 52 in the contact maker 51 in such a way, a magnetic field to drive the arc in the circumferential direction of the common axis of both contact makers 51 and 57 and to improve the breaking performance can be generated without making the breaking member structure complex, generating a trouble of insulation, and making the gas switching device in a large size.
IWAI HIROMI
TSUTSUMI MUTSUO
