IEEE C37.04a-2025

Withdrawn Amendment
IEEE Standard for Ratings and Requirements for AC High-Voltage Circuit Breakers with Rated Maximum Voltage Above 1000 V

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IEEE C37.04a-2025

Amendment Standard - Active.

Items discovered by users related to discrepancies with other industry standards will be addressed by this amendment:

  • Harmonize pollution levels for normal service condition,
  • Further define requirements for capacitive switching class C0,
  • Clarify required electrical service capability,
  • Improve definition of interrupting time,
  • Implement requirements from IEEE C37.11 which are more properly in C37.04,
  • Align material imported from NEMA SG-4 with current industry practices.

This amendment will address items discovered by users related to discrepancies with other industry standards:

  • Harmonize pollution levels for normal service condition.
  • Improve definition of low temperature requirements.
  • Further define requirements for capacitive switching class C0.
  • Clarify required electrical service capability.
  • Harmonize temperature limitations for contacts in non-oxidizing gases.
  • Improve definition of interrupting time.
  • Implement requirements from IEEE C37.11 which are more properly in C37.04.
  • Align material imported from NEMA SG-4 with current industry practices.
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