IEC 62271-110:2023

Overview

IEC 62271-110:2023 - High-voltage switchgear and controlgear – Part 110: Inductive load switching - is the fifth edition of the IEC standard that defines requirements and type-test procedures for AC switching devices used to interrupt or make inductive currents on high‑voltage systems. It applies to indoor and outdoor switching equipment operating at 50 Hz or 60 Hz on systems above 1 000 V, and covers switching of high-voltage motor currents and shunt‑reactor currents. This edition is a technical revision that updates references to the latest editions of IEC 62271-100 (circuit‑breakers) and IEC 62271-106 (high-voltage contactors).

Key topics and technical requirements

• Scope and exclusions
  • Applies to circuit-breakers and contactors used for motor and shunt reactor switching.
  • Explicitly excludes switching of transformer magnetizing currents and certain neutral‑reactor earthing schemes (see IEC TR 62271-306 for related guidance).
• Type tests and test-duties
  • Defines type-test procedures for motor current switching and shunt reactor switching, including required test circuits, measurements and reporting.
  • Specifies test-duties (operational sequences) to verify device performance under realistic inductive load conditions.
• Transient performance
  • Addresses transient phenomena such as transient recovery voltage (TRV), current chopping, virtual current chopping, suppression peak and recovery peak and includes provisions for measuring and limiting these effects.
• Test circuits and parameters
  • Provides standardised test circuit configurations, supply and load characteristics, connecting lead requirements, earthing arrangements and test voltages for different in‑service scenarios.
• Documentation
  • Requires detailed test reports documenting behavior, measurements, and post‑test condition of the switching device.

Practical applications - who uses this standard

• Manufacturers of high‑voltage circuit-breakers, contactors and switchgear use IEC 62271-110:2023 to design and validate products for safe inductive load switching.
• Independent test laboratories and certification bodies apply the standard’s type‑test procedures to assess compliance and performance.
• Utilities, substations and industrial power system designers rely on the standard to select equipment suitable for switching motors and shunt reactors without undue overvoltages or equipment damage.
• Procurement and compliance teams cite the standard in specifications and contracts to ensure interoperability and safety.

Related standards

• IEC 62271-1 - Common specifications for AC high‑voltage switchgear and controlgear
• IEC 62271-100 - Alternating‑current circuit‑breakers
• IEC 62271-106 - High‑voltage contactors and motor‑starters
• IEC TR 62271-306 - Guidance on special switching duties
• IEC 60050-441 - Electropedia vocabulary for switchgear and controlgear

Using IEC 62271-110:2023 helps ensure reliable, repeatable testing and consistent performance of high‑voltage switching equipment under inductive load duties, reducing the risk of overvoltages and improving overall system safety.