IEEE C37.04f-1990

C37.04f-1990 is a technical standard for voltage circuit breakers rated on a symmetrical current basis, giving engineers a reference for how breaker ratings are defined and applied in power systems. As part of the power, energy and industry applications field, it helps support consistent selection and comparison of switching equipment. For procurement, design, and specification work, C37.04f-1990 provides a focused basis for understanding rated performance in circuit breaker applications.

What is C37.04f-1990?

C37.04f-1990 addresses the rating framework for voltage circuit breakers when current values are expressed on a symmetrical current basis. That makes it relevant to the technical definition of breaker capabilities rather than general electrical practice. The document is useful when evaluating how interrupting and related ratings are stated, interpreted, and compared across equipment. For teams working with breaker specifications, this standard helps establish a common language for rating-related requirements.

Where is C37.04f-1990 used?

C37.04f-1990 is commonly used in power distribution and industrial electrical systems where voltage circuit breakers are selected, specified, or reviewed for service duty. It may apply to engineering documents, procurement specifications, equipment submittals, and compliance checks involving breaker ratings. Typical use cases include switchgear assemblies, feeder protection, and other circuit interruption applications where symmetrical current values are central to equipment comparison and system coordination.

Why is C37.04f-1990 important?

This standard matters because breaker ratings must be understood consistently to support safe design and reliable equipment selection. By defining the rating basis for voltage circuit breakers, C37.04f-1990 helps reduce ambiguity in specifications and testing references. That can improve procurement decisions, limit misinterpretation of performance claims, and support better coordination between system requirements and device capabilities. In practice, it aids risk reduction in electrical power applications.

• Symmetrical current rating basis
• Voltage circuit breaker specification
• Power system equipment comparison
• Procurement and compliance reference
• Breaker performance interpretation