The primary function of this specification is to cover the general requirements of one-, two-, and three-pole trip-free circuit breakers for use in aircraft electric systems conforming to MIL-STD-704. As a secondary function, this specification may possibly cover the general requirements of one-, two-, and three- pole circuit breakers for use in primary vehicles, other than aircraft, when mounted directly to the structure. An Amendment corresponding to this standard has been published. To download a free copy, go to the SAE website at www.sae.org and search on the document number. The summary page of the standard will display a link for downloading the Amendment.