Development of a large ratio-release circuit-breaker mechanism

DESPITE commendable efforts and admirable successes toward the development of aircraft circuit breakers, a wholly acceptable solution apparently has not yet been found; therefore, much can be gained from the observation of existing imperfections. In addition to new and original creations, considerable contributions toward improved circuit-breaker constructions can be had through the process of elimination applied to present shortcomings. It will aid in the examination of circuit-breaker capabilities to recognize the circumstances which prompted the earlier adoption of specific features which are now undesirable. Various reasons which may account for these conditions are: lack of earlier requirements, lax co-ordination among protection devices and circuit-equipment specifications, or excessive speed applied to the development of certain circuit breakers because of national emergencies.