IEEE C37.04g-1986

C37.04g-1986 is a technical standard for voltage circuit breakers rated on a symmetrical current basis, giving engineers and buyers a defined reference for rating and selection. It helps frame how these devices are specified within power, energy, and industrial applications, where current interruption performance and equipment compatibility matter. As a superseded document, C37.04g-1986 is mainly useful for understanding legacy requirements, historical design practices, and older procurement or compliance records.

Overview of C37.04g-1986

This standard addresses the rating basis used for voltage circuit breakers, with particular attention to symmetrical current values. In practical terms, that means it supports a consistent way to describe breaker capability under specified electrical conditions. C37.04g-1986 is relevant to circuit protection and system coordination work where ratings must be compared accurately across equipment types. For users working with older specifications, it can help interpret technical language and align documentation with the intended breaker performance basis.

Typical use cases

C37.04g-1986 is typically consulted when reviewing voltage circuit breaker specifications, comparing rated current values, or checking legacy equipment documentation. It may be used in utility substations, industrial distribution systems, and power equipment procurement where symmetrical current rating terminology appears in drawings, datasheets, or contract requirements. The standard can also support engineering review during maintenance planning, replacement sourcing, or design verification for breaker-related components and system interfaces.

Why it matters

Clear rating definitions matter because circuit breakers must be selected and applied with confidence in fault and load conditions. C37.04g-1986 helps reduce ambiguity in how breaker performance is stated, which supports safer design choices, more consistent testing, and better procurement comparisons. For organizations dealing with legacy installations, the standard can also improve record interpretation and reduce the risk of mismatched equipment ratings. In short, it provides a technical basis for reliable specification and compliance review.

• Voltage circuit breaker rating basis
• Symmetrical current definitions
• Legacy specification reference
• Power and industrial applications
• Superseded technical document