IEC 62271-111:2012

Overview

IEC 62271-111:2012 is the international standard that specifies requirements, tests and ratings for automatic circuit reclosers (ACRs) and fault interrupters for single- or multi-pole alternating‑current systems with rated maximum voltages above 1 000 V and up to 38 kV. It covers overhead, pad‑mounted, dry‑vault and submersible reclosers and fault interrupters. Edition 2.0 (2012) is a technical revision harmonized with IEEE Std C37.60‑2012 and is intended to be read in conjunction with IEC 62271‑1:2007.

Key Topics and Technical Requirements

• Scope and service conditions: Defines normal and special service conditions (altitude, pollution, temperature, vibration, wind) for indoor and outdoor installations.
• Ratings and characteristics: Requirements for rated voltage, frequency, rated normal current, rated short‑time and peak withstand currents, rated interrupting and making currents, and rated operating sequences.
• Transient Recovery Voltage (TRV): Updated TRV calculation guidance, including harmonization of the amplitude factor (kaf) for cable‑connected systems consistent with IEEE/IEC circuit‑breaker harmonization.
• Design and construction: Enclosure protection (IP/IK), insulation and creepage distances, liquid/gas tightness, tank construction for submersible/dry‑vault units, stored energy and power operation provisions, nameplates and position indication.
• Type tests and routine tests: Dielectric tests, temperature‑rise, short‑time and peak withstand current tests, tightness tests, EMC testing, auxiliary/control circuit tests. Note: radio influence voltage (RIV) test requirements were deleted in this edition.
• Special device types: Addition of specifications and ratings for cutout reclosers and their special requirements.
• Operational mode exclusions: Excludes devices with dependent manual operation (per clause 1.1).

Practical Applications and Who Uses This Standard

IEC 62271‑111 is essential for:

• Utilities and distribution network operators specifying ACRs and fault interrupters for overhead and underground distribution systems.
• Manufacturers and designers developing reclosers, cutout reclosers, and submersible fault interrupters to meet international test and safety benchmarks.
• Test laboratories performing type and routine testing (dielectric, TRV, short‑circuit, EMC).
• Protection and relay engineers, procurement/specification teams, and standards compliance officers ensuring equipment interoperability and safety up to 38 kV.

Typical applications include automated fault isolation and service restoration, rural and urban distribution feeders, pad‑mounted transformer protection, and submarine/submersible installations.

Related Standards

• IEC 62271‑1:2007 - General definitions and common requirements for high‑voltage switchgear and controlgear (to be read together).
• IEEE Std C37.60‑2012 - Harmonized companion standard (joint revision).

Keywords: IEC 62271-111, automatic circuit recloser, fault interrupter, high-voltage switchgear, 38 kV, TRV, IEEE C37.60, type tests, pad-mounted recloser, submersible recloser.