IEC TR 62271-310:2004 High-voltage switchgear and controlgear - Part 310: Electrical endurance testing for circuit-breakers of rated voltage 72,5 kV and above
Applicable to class E2 circuit-breakers rated 72,5 kV and above, intended for use on overhead lines.
IEC TR 62271-310:2004 history
2008IEC TR 62271-310:2008 High-voltage switchgear and controlgear - Part 310: Electrical endurance testing for circuit-breakers a rated voltage 52 kV
2004IEC TR 62271-310:2004 High-voltage switchgear and controlgear - Part 310: Electrical endurance testing for circuit-breakers of rated voltage 72,5 kV and above