IEEE 62271-111-2005

IEEE 62271-111-2005 is a technical standard for high-voltage switchgear and controlgear, focused on overhead, pad-mounted, dry vault, and submersible automatic circuit reclosers and fault interrupters for alternating current systems up to 38 kV. It is relevant to power, energy, and industrial applications where distribution protection and switching need to be defined with care. The standard helps align equipment requirements, ratings, and performance expectations for these specific installation environments.

IEEE 62271-111-2005 overview

This standard addresses automatic circuit reclosers and fault interrupters used in medium-voltage AC distribution systems. IEEE 62271-111-2005 provides a technical basis for equipment intended for overhead lines and enclosed or submerged installations, including pad-mounted and dry vault service. Its scope is closely tied to high-voltage switchgear and controlgear practice, making it useful for comparing designs, specifying operating characteristics, and evaluating suitability for systems up to 38 kV. The document is superseded, so it is mainly used for legacy reference and historical compliance review.

Typical use cases

IEEE 62271-111-2005 is typically consulted when selecting or reviewing automatic reclosers and fault interrupters for utility distribution feeders, industrial power networks, and constrained installation sites. It is particularly relevant for overhead circuits, pad-mounted gear serving local distribution, and equipment placed in dry vault or submersible locations where environmental conditions shape the design. Engineers and procurement teams may use it to compare protection equipment, define acceptance expectations, and support specification work for AC systems operating up to 38 kV.

Why this standard matters

This standard matters because protective switching equipment must perform consistently under fault conditions while fitting the chosen installation type. IEEE 62271-111-2005 helps reduce ambiguity in design, rating, and testing for reclosers and fault interrupters, which supports safer operation and more predictable procurement decisions. For organizations maintaining or reviewing legacy systems, it also offers a clear reference point for technical documentation, compatibility checks, and risk control. Its superseded status makes accurate document selection especially important.

• Automatic circuit reclosers
• Fault interrupters for AC systems
• Overhead, pad-mounted, and vault applications
• Submersible equipment considerations
• Up to 38 kV distribution service