This standard provides the preferred ratings for low-voltage ac (635 V and below) power circuit breakers,fused low-voltage ac (600 V and below) power circuit breakers, general purpose dc (325 V and below) power circuit breakers, and low-voltage dc (3200 V and below) power circuit breakers.
IEEE C37.16-2009
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IEEE Standard for Preferred Ratings,Related Requirements, and Application Recommendations for Low-Voltage AC (635 V and below)and DC (3200 V and below) Power Circuit Breakers