IEEE C37.04a-2025

IEEE Standard for Ratings and Requirements for AC High-Voltage Circuit Breakers with Rated Maximum Voltage Above 1000 V Amendment 1: Changes to Construction Requirements and Clarification of Certain Related Required Capabilities

Amendment by IEEE , 09/24/2025

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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.