This standard applies to ac high-voltage circuit breakers with rated maximum voltage above 1000 V. It establishes a rating structure, preferred ratings, and construction and functional component requirements. This standard encompasses: - Three pole circuit breakers used in three-phase systems - Single pole circuit breakers used in single-phase systems - Attachments for these circuit breakers, such as bushings, current transformers, interlocks, shunt trips, etc. and auxiliary equipment sold with the circuit breakers such as closing relays and structural steel supports. This standard does not cover circuit breakers used at frequencies other than 50 Hz or 60 Hz, or generator circuit breakers that are covered in IEEE Std C37.013.
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