IEEE C37.09a-2025

This standard applies to ac high-voltage circuit breakers with rated maximum voltage above 1000 V. It defines various tests that are made on ac high-voltage circuit breakers, except for generator circuit breakers, which are covered in IEC/IEEE 62271-37-013:2015 [B14] (formerly IEEE Std C37.013™-1997[B29]). It specifies the tests and describes the accepted methods used to verify assigned ratings defined in IEEE Std C37.04™. It also describes the test procedures associated with production and field installation.



Amendment Standard - Active. Items discovered by users and manufacturers related to discrepancies with other standards, and uncertainties in testing procedures will be addressed in this amendment. For further details, see the introduction.