IEEE 320-1972

IEEE 320-1972 is a technical standard that provides an application guide for high voltage circuit breakers rated on a symmetrical current basis. It is intended to support engineers and specifiers working with power-system switching equipment by clarifying how such breakers are selected and applied. In the context of power, energy, and industrial applications, the document helps promote consistent rating practice, safer engineering decisions, and better alignment between breaker capability and system requirements.

What is IEEE 320-1972?

IEEE 320-1972 is a guidance document for the application of high voltage circuit breakers when ratings are expressed using symmetrical current. That makes it relevant to electrical equipment where breaker performance, interrupting duty, and system fault conditions must be considered together. The standard is useful for understanding how the breaker rating basis should be interpreted in design and specification work. As a superseded IEEE 320-1972 standard, it also serves as a reference point for historical engineering practice.

Where is IEEE 320-1972 used?

This standard is commonly used in power-system planning, substation equipment selection, and specification of high voltage switching devices. It may be referenced by engineers responsible for utility networks, industrial electrical distribution, and other installations where circuit breakers must handle symmetrical fault current conditions. IEEE 320-1972 is especially relevant when comparing breaker ratings, reviewing application assumptions, or documenting procurement requirements for high voltage equipment in components, circuits, devices, and systems.

Why is IEEE 320-1972 important?

IEEE 320-1972 matters because correct breaker application is central to electrical safety and reliable interruption performance. By focusing on symmetrical current rating practice, it helps reduce ambiguity in design reviews, compliance checks, and equipment comparison. That can support more consistent procurement decisions and better coordination between system requirements and breaker capability. For projects involving high voltage circuit breakers, the standard provides a useful technical basis for controlling risk and improving engineering consistency.

• High voltage circuit breaker application guidance
• Symmetrical current rating basis
• Power and industrial electrical systems
• Specification and procurement reference
• Historical superseded IEEE document