IEEE C37.04-1979
Voltage Circuit Breakers Rated on a Symmetrical Current Basis
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About This Item
C37.04-1979 is a technical standard for voltage circuit breakers rated on a symmetrical current basis, providing a common framework for rating and evaluation in power, energy, and industrial applications. It helps define how these breakers are identified and compared under electrical system conditions, supporting more consistent selection and application. For engineers, purchasers, and maintenance teams, the standard is useful when assessing breaker capability, compatibility, and expected performance in circuit protection arrangements.
Overview of C37.04-1979
This standard addresses voltage circuit breakers by focusing on symmetrical current ratings, which are central to how interrupting and withstand capabilities are described in electrical equipment practice. C37.04-1979 is relevant to situations where breaker ratings must be interpreted consistently across design, procurement, and testing activities. As a superseded technical document, it remains useful for referencing legacy equipment requirements, historical specifications, or archived engineering records tied to power system protection.
Typical use cases
C37.04-1979 is commonly consulted when specifying or reviewing voltage circuit breakers for substations, industrial distribution systems, and other power equipment installations. It may also support comparison of legacy breaker documentation, rating calculations, and engineering checks for symmetrical current-based performance. In practice, it can help teams align breaker selection with system fault levels, protection coordination studies, and maintenance planning for installed switchgear or related electrical apparatus.
Why it matters
Using a clear rating basis is important because circuit breakers must perform reliably under fault conditions and within defined system limits. C37.04-1979 supports consistency in compliance review, technical procurement, and equipment comparison, reducing the risk of misunderstanding breaker capability. For older power systems and legacy assets, the standard can also help preserve continuity in documentation and engineering decisions when evaluating replacements, upgrades, or spare parts.
- Voltage circuit breaker rating basis
- Symmetrical current terminology
- Legacy power system reference
- Protection and coordination support
- Superseded technical document
- Publication Date: 1980
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: C37.04 (2021)
- Previous Version: C37.04 (2019)
- Previous Version: C37.04 (2009)
- Previous Version: C37.04 (2008)
- Previous Version: C37.04 (2003)
- Previous Version: C37.04 (1999)
- Previous Version: C37.04 (1991)
- Previous Version: C37.04 (1991)
- Previous Version: C37.04 (1990)
- Previous Version: C37.04 (1988)
- This Version: C37.04 (1980)
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