IEEE/ANSI C37.06-2000

This standard is applicable to three-pole circuit breakers used in three-phase systems and single-pole circuit breakers used in single-phase systems, both indoor and outdoor AC high-voltage types, rated above 1000 volts on a symmetrical current basis. This standard does not cover circuit breakers used at rated frequencies other than 50 Hz or 60 Hz, or generator circuit breakers that are covered in IEEE Std. C37.013.

Since the existing rating structures are being revised under related projects PC37.04a, PC37.04b, PC37.09a, PC37.09b, PC37.011 and PC37.012, the purpose of this work is to provide relevant values of preferred ratings for the new rating structures. Another purpose is to integrate C37.06, formerly sponsored by NEMA, into the IEEE SA process of standards dvelopment. Sponsorship is now being transferred to the IEEE Switchgear Committee.

New IEEE Standard - Superseded. This standard is a revision of ANSI C37.06-1997. It reflects small editorial changes needed to coordinate with the final wording contained in the defining standards ANSI/IEEE C37.04-1999 and ANSI/IEEE C37.09-1999. Some ratings have also been updated. Because this revision is primarily editorial in nature, this Foreword describes the substantive and editorial changes between this revision and the 1987 version. The format of the tables remains very much the same, except that some ratings, which had been given in the notes (sometimes on a different page from the table of preferred ratings), have been listed explicitly in the tables.