IEEE C37.62-2020

C37.62-2020 is a technical standard for mounted dry vault, submersible, and overhead fault interrupters used on alternating current systems up to and including 38 kV. It addresses the performance and design expectations for interruption devices used in power distribution equipment, where reliable fault clearing is important to system continuity and safety. For engineers, purchasers, and compliance teams, this standard helps define a common basis for evaluating equipment intended for medium-voltage applications.

C37.62-2020 overview

This standard focuses on fault interrupters in medium-voltage AC systems, including equipment installed in dry vaults, below grade, or on overhead distribution structures. C37.62-2020 is intended to guide how these devices are specified, rated, and assessed for use in power and energy applications. It is especially relevant where interruption performance, insulation coordination, and operating conditions must align with the surrounding installation environment. The document supports consistent engineering and procurement decisions for related equipment.

Typical use cases

C37.62-2020 is commonly used when selecting or evaluating fault interrupters for distribution networks serving utility feeders, industrial plants, and other AC systems up to 38 kV. It is relevant for mounted dry vault installations in enclosed utility spaces, submersible applications in wet or underground locations, and overhead installations on poles or structures. The standard may also support specification work for switching and protection equipment where fault interruption characteristics need to match the system layout and service conditions.

Why this standard matters

In practice, C37.62-2020 helps reduce uncertainty in design, testing, and procurement of fault interrupters for medium-voltage systems. By setting a common technical reference, it supports safer equipment selection, more consistent performance expectations, and clearer compliance checks. This is important when different installation environments place different demands on insulation, enclosure integrity, and operating reliability. Using the standard can also help compare products more objectively during specification review and acceptance testing.

• Fault interrupters for AC systems up to 38 kV
• Mounted dry vault, submersible, and overhead applications
• Medium-voltage power and energy equipment context
• Specification, rating, and performance reference
• Safety and compliance support for procurement