IEEE PC37.09b
Voltage Circuit Breakers Rated on a Symmetrical Current Basis Amendment 2: To Change the Description of Transient Recovery Voltage for Harmonization with IEC 62271-100
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Language: English
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About This Item
PC37.09b is a technical amendment for voltage circuit breakers rated on a symmetrical current basis, with a focus on revising the description of transient recovery voltage for harmonization with IEC 62271-100. It is relevant to power and energy equipment where interruption performance, rating interpretation, and test alignment matter. As an inactive standard, it is most useful for referencing legacy requirements, comparing document revisions, or understanding how circuit breaker terminology and recovery voltage descriptions were aligned for engineering consistency.
Overview of PC37.09b
This document addresses a specific amendment within the circuit breaker standards family, refining how transient recovery voltage is described for voltage circuit breakers rated on a symmetrical current basis. That technical context matters because recovery voltage characteristics are central to interruption behavior, insulation coordination, and test interpretation. PC37.09b helps clarify terminology so that ratings and performance expectations can be compared more consistently across related specifications, especially where harmonization with IEC 62271-100 is important.
Typical use cases
PC37.09b may be used when reviewing legacy breaker specifications, checking historical rating language, or comparing amendment-level changes in interruption and recovery voltage terminology. It is relevant to engineers working with medium- and high-voltage circuit breakers, utility substation equipment, and associated test documentation. Procurement teams and standards specialists may also consult it when evaluating whether an older breaker requirement set aligns with later harmonized language or when tracing technical requirements across revisions.
Why it matters
Clear definitions for transient recovery voltage support safer and more consistent circuit breaker design, testing, and selection. For equipment rated on a symmetrical current basis, small wording differences can affect how interruption performance is interpreted and how compliance evidence is prepared. PC37.09b reduces ambiguity in technical documentation, which can improve coordination between manufacturers, users, and test laboratories. It is especially useful when consistency across related standards is needed for risk reduction and specification control.
- Voltage circuit breakers
- Symmetrical current basis ratings
- Transient recovery voltage terminology
- IEC 62271-100 harmonization
- Legacy amendment reference
- Publication Date: 2010
- Standard Status: Inactive
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications; Components, Circuits, Devices and Systems
- Official IEEE: Doi link
- New Version Available: PC37.09 (2025)
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- This Version: PC37.09 (2010)
- Previous Version: PC37.09 (2009)
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- Previous Version: PC37.09 (2006)
- Previous Version: PC37.09 (2006)
- Previous Version: PC37.09 (2004)
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