Large indoor air-blast circuit breakers

IN early experiments and studies of the air-blast circuit breaker, the conclusion was reached that no upper limit of interrupting capacity within a reasonably visualized range existed. This conviction was expressed by P. L. Taylor and H. W. Martin in a paper presented at a meeting of the AIEE in New York in 1942. As a matter of fact, it was surmised that whether the arc was drawn axially with the blast or perpendicular to the same, interruption always occurred with the arc axial with the blast. The reason for this appears to be the greater action of the blast on the radially diffused thermal ions when the arc is parallel to and surrounded by the blast.