Superseded by C37.09-1999. Supplement to IEEE C37.09-1979 Available at no charge Abstract: This supplement to C37.09-1979 adds a paragraph at the end of 4.6.5.4, contains a new section for the initial transient recovery voltage, and makes a change to 4.6.6, Methods of Demonstrating the Short-Circuit Current Rating of a Circuit Breaker.