2000NEMA C37.06-2000 AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities This is Now Copyrighted by IEEE [Replaced: ANSI C37.06, ANSI C37.06]
1997NEMA C37.06-1997 AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities