IEEE C37.27-1987
Voltage AC Nonintegrally Fused Power Circuit Breakers (Using Separately Mounted Current-Limiting Fuses)
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About This Item
C37.27-1987 is a technical standard for voltage AC nonintegrally fused power circuit breakers using separately mounted current-limiting fuses. It addresses how this equipment is defined, rated, and evaluated within power, energy, and industrial applications. For engineers and buyers, the standard helps clarify the expected behavior of breaker-and-fuse combinations, supporting safer design choices, more consistent procurement, and better alignment with operating requirements in AC power systems.
About C37.27-1987
This standard focuses on AC power circuit breakers that are not integrally fused, but instead rely on separately mounted current-limiting fuses for protection. C37.27-1987 is relevant where coordination between the breaker and the external fuse affects performance, interruption duty, and system protection. In practice, it serves as a technical reference for describing equipment capabilities and boundaries, helping users compare products on a common basis when specifying or reviewing breaker assemblies for power applications.
Where is C37.27-1987 used?
C37.27-1987 is typically used in electrical power systems and industrial installations where medium- or high-voltage AC circuit breakers are paired with separately mounted current-limiting fuses. These arrangements may appear in substations, switchgear lineups, feeder protection schemes, and other equipment rooms where coordinated interruption is important. The standard is most useful when the breaker-fuse combination must be selected to fit a defined duty, operating level, and protection strategy within a broader power distribution workflow.
Importance in practice
In practice, the value of C37.27-1987 lies in helping teams specify and evaluate breaker and fuse combinations with greater confidence. It can support compliance reviews, procurement decisions, and design verification by giving a common technical frame for ratings and expected performance. For systems that depend on current-limiting fuses as part of the protection scheme, the standard helps reduce ambiguity, improve consistency between vendors, and lower the risk of mismatched equipment in service.
- Voltage AC breaker applications
- Separately mounted current-limiting fuses
- Power system protection coordination
- Equipment rating and specification
- Industrial and utility electrical use
- Publication Date: 1987
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
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