IEEE PC37.013a/D6

IEEE PC37.013a/D6 is an unapproved draft IEEE standard for AC high voltage generator circuit breakers rated on a symmetrical current basis, with Amendment 1 adding a supplement for generators rated 10-100 MVA. It addresses technical requirements that help align breaker selection, rating, and application with generator system conditions. For power, energy, and industrial applications, this draft matters because it supports more consistent engineering decisions where generator protection and switching performance are critical.

Overview of IEEE PC37.013a/D6

This document focuses on AC high voltage generator circuit breakers used in generator-connected power systems. The scope indicated by IEEE PC37.013a/D6 centers on symmetrical current ratings and the amendment’s supplement for 10-100 MVA generators, which suggests attention to a defined operating range and associated application needs. As a draft standard, it is relevant to engineers and technical teams reviewing breaker suitability, coordination, and design expectations for generator switching equipment.

Typical use cases

IEEE PC37.013a/D6 is typically relevant in generator sets, plant auxiliary systems, and industrial power installations where a high voltage circuit breaker must interrupt or isolate generator output under symmetrical current conditions. It may be used when evaluating equipment for medium-sized generators in the 10-100 MVA range, especially in projects that require coordinated protection, switching, and system integration. Procurement and engineering teams may also use it when comparing breaker specifications for generator-connected applications.

Why it matters

This standard matters because generator circuit breakers must perform reliably under demanding electrical conditions, and rating clarity helps reduce design and application risk. IEEE PC37.013a/D6 supports more consistent specification and review of breaker capability, which can improve compliance checks, testing alignment, and procurement decisions. For projects involving generator protection, using a defined technical reference helps avoid mismatches between equipment ratings and actual system requirements, supporting safer and more predictable operation.

• AC high voltage generator circuit breakers
• Symmetrical current rating basis
• Generator applications in the 10-100 MVA range
• Equipment selection and rating verification
• Protection and switching coordination