IEEE C37.42-2009
Voltage (> 1000 V) Expulsion-Type Distribution-Class Fuses, Fuse and Disconnecting Cutouts, Fuse Disconnecting Switches, and Fuse Links, and Accessories Used with These Devices
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About This Item
C37.42-2009 is a technical standard for voltage above 1000 V expulsion-type distribution-class fuses, fuse and disconnecting cutouts, fuse disconnecting switches, and related fuse links and accessories. It addresses equipment used in power, energy, and industry applications where dependable interruption, insulation, and coordinated protection are important. For purchasers, engineers, and maintenance teams, this standard helps define a common basis for selecting and comparing devices intended for distribution systems and outdoor or utility-type service.
Overview of C37.42-2009
The purpose of C37.42-2009 is to provide a focused framework for the design and application of expulsion-type distribution-class fuse equipment used at voltages above 1000 V. The standard is centered on the fuse device itself, associated disconnecting cutouts, fuse disconnecting switches, fuse links, and accessories that support these assemblies. In practice, it helps establish expectations for ratings, construction, and performance so that equipment can be applied more consistently in higher-voltage distribution environments.
Typical use cases
This standard is commonly relevant to utility distribution feeders, transformer protection, and other medium- to higher-voltage circuits where expulsion-type fuses are used for fault interruption and isolation. It may also apply to disconnecting cutouts and fuse disconnecting switches installed on overhead lines, service points, or related distribution equipment. C37.42-2009 is useful when specifying replacement parts, evaluating fuse links, or coordinating protection devices in power and industrial electrical systems.
Why it matters
For organizations working with distribution-class protection equipment, the standard supports safer and more consistent procurement, design review, and equipment comparison. It helps reduce ambiguity around how fuse assemblies and accessories should be identified and applied, which can matter when coordinating interruption capability, insulation levels, and maintenance practices. Because C37.42-2009 is superseded, it is also important for legacy documentation, historical reference, and checking older equipment specifications against the correct technical basis.
- Voltage above 1000 V application scope
- Expulsion-type distribution-class fuse equipment
- Fuse and disconnecting cutouts
- Fuse disconnecting switches and fuse links
- Accessories for distribution protection assemblies
- Publication Date: 2010
- Standard Status: Superseded
- Publisher: IEEE
- Subject: Power, Energy and Industry Applications
- Official IEEE: Doi link
- New Version Available: C37.42 (2017)
- This Version: C37.42 (2010)
- Previous Version: C37.42 (1996)
- Previous Version: C37.42 (1961)
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