In order to study and manufacture a large power backup quenching protection breaker in the Tokamak device

this paper introduces the configuration and the operation principle of a special explosive breaker system

and gives its design principle. The interruption and commutating current characteristics are analyzed by ways of combining theory and experiment. The result shows that this kind of breaker system meets the requirements of the quenching protection breaker system

which will be used in Tokamak device.