IEEE C37.20.3-1987

C37.20.3-1987 is a standard for enclosed interrupter switchgear used in power, energy, and industrial applications. It addresses the technical expectations for equipment that combines interruption and switching functions within an enclosed assembly, helping engineers and buyers evaluate design, rating, and construction considerations more consistently. As an established document, C37.20.3-1987 is useful when specifying switchgear for systems where dependable operation, safe access, and coordinated performance are important.

Overview of C37.20.3-1987

This standard focuses on the enclosed interrupter switchgear category, which generally sits between basic switching equipment and more complex medium-voltage assemblies. It is intended to guide how the equipment is defined and assessed for electrical performance, enclosure requirements, and practical installation expectations. For technical teams working with power distribution equipment, C37.20.3-1987 provides a reference point for comparing products, documenting requirements, and supporting consistent engineering decisions across projects.

Typical use cases

Enclosed interrupter switchgear covered by this standard is commonly used in electrical distribution environments where switching and interruption need to be contained in a rugged enclosure. Typical applications may include industrial power systems, utility-related distribution equipment, and plant or facility feeders that require controlled isolation and dependable service. C37.20.3-1987 is especially relevant when specifying gear for switchboards, feeder sections, or other assemblies where space, access, and operational safety are key considerations.

Why it matters

In procurement and design work, C37.20.3-1987 helps create a shared basis for compliance, testing, and product comparison. That can reduce ambiguity when evaluating switchgear construction, ratings, and expected performance in service. Using a defined standard also supports safer selection and more consistent documentation, which matters when equipment must integrate into a larger power system without unnecessary risk. For projects that depend on enclosed interrupter switchgear, the standard helps keep expectations clear.

• Enclosed interrupter switchgear requirements
• Power and industrial distribution context
• Equipment rating and construction reference
• Selection, testing, and specification support