Vapor-state current limiting circuit breaker

Abstract From the Canadian patent

A current limiting circuit breaker capable of interrupting a short circuit current of hundreds of thousands of amperes well short of its prospective peak amplitude utilizes a vapor-state current limiter to directly operate circuit interrupter contacts. The current limiter connected in series with the interrupter contacts, incorporates a ram whose movement in response to vaporization and resulting expansion of the current limiting material is directly operatively coupled to open the interrupter contacts with exceptional speed.