PC37.13 / D21, Dec 2007 is a technical standard for voltage AC power circuit breakers used in enclosures, addressing design and application concerns relevant to power, energy, and industry applications. It is the kind of document that helps define how enclosed circuit breakers should perform and be evaluated in service. As a revision of C37.13-2006, PC37.13 / D21, Dec 2007 is useful for organizations that need a clear reference for product requirements, consistency, and practical electrical engineering decisions.

Overview of PC37.13 / D21, Dec 2007

This standard focuses on voltage AC power circuit breakers installed in enclosures, where electrical protection, insulation coordination, and equipment arrangement can affect overall reliability. PC37.13 / D21, Dec 2007 provides a structured basis for understanding the expected characteristics of these breakers in enclosed applications. In power and industrial settings, such a document is typically used to support specification writing, design review, and technical comparison of equipment intended for controlled switching and protective duty.

Typical use cases

PC37.13 / D21, Dec 2007 is commonly relevant when selecting or reviewing enclosed AC power circuit breakers for switchgear assemblies, electrical rooms, plant distribution systems, and other managed power installations. It may be used during procurement, engineering documentation, and acceptance checks where breaker performance and enclosure integration matter. The standard is especially useful in projects that require a consistent technical reference for enclosed protection equipment serving industrial facilities, utility-adjacent systems, or large commercial power networks.

Why it matters

For teams working with enclosed power circuit breakers, PC37.13 / D21, Dec 2007 helps reduce ambiguity in design and purchasing decisions. A clear standard supports compliance efforts, improves consistency across equipment selections, and can lower the risk of mismatched ratings or unsuitable applications. It also gives engineers and buyers a common technical language for evaluating performance expectations, which is important when safety, maintainability, and reliable operation are central to the project.

• Voltage AC power circuit breakers in enclosures
• Revision reference: C37.13-2006
• Power, energy, and industrial applications
• Design, specification, and evaluation support
• English-language technical document