IEEE C37.04h-1990

C37.04h-1990 is a technical standard for voltage circuit breakers rated on a symmetrical current basis, providing guidance relevant to power, energy, and industrial applications. It helps define how these breakers are rated and evaluated so their performance can be compared more consistently across equipment and procurement requirements. For organizations working with medium- and high-power switching gear, this standard supports clearer engineering decisions, better specification alignment, and more reliable selection of circuit protection equipment.

About C37.04h-1990

C37.04h-1990 addresses the rating framework for voltage circuit breakers when symmetrical current is the basis for assessment. In practice, this matters because breaker ratings influence how equipment is specified, tested, and matched to system fault conditions. The standard is commonly used as a reference point for understanding rated performance characteristics and ensuring that circuit breakers are described in a consistent technical manner. For buyers and engineers, C37.04h-1990 can help reduce ambiguity during review and approval.

Where is C37.04h-1990 used?

This standard is most relevant in electrical power systems and industrial distribution environments where voltage circuit breakers are selected for switching and fault-interruption duties. It may be used when reviewing switchgear assemblies, comparing breaker ratings, or checking compliance documentation for power equipment. Typical use cases include utility substations, plant electrical rooms, and other installations that rely on rated interruption performance. C37.04h-1990 is especially useful when symmetrical current rating data must be interpreted consistently.

Importance in practice

Using C37.04h-1990 helps improve consistency in design and procurement by giving engineers and purchasers a common basis for breaker ratings. That reduces the risk of misapplication, especially where interrupting duty and system fault levels must be aligned carefully. It also supports more reliable testing and documentation, since equipment can be compared against a defined technical reference rather than informal descriptions. For power applications, that kind of clarity is important for safety, performance, and long-term equipment selection.

• Voltage circuit breaker rating basis
• Symmetrical current evaluation
• Power and industrial electrical systems
• Specification and procurement reference
• Performance and compliance review