IEC 62271-106:2011

Overview

IEC 62271-106:2011 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies requirements for high-voltage alternating current (a.c.) contactors, contactor-based controllers, and motor-starters. This standard applies to devices intended for indoor installation and operation on electrical systems with voltages above 1,000 V and up to 24,000 V, operating at frequencies up to and including 60 Hz. It focuses primarily on three-pole devices for three-phase systems and single-pole devices for single-phase systems, including specific guidelines on various types of motor starters and controllers.

This standard replaces the earlier IEC 60470:1999 edition, extending the voltage range and introducing several technical revisions. It serves as a critical reference for manufacturers, users, and professionals involved in the design, testing, and application of high-voltage switchgear and controlgear in industrial, commercial, and utility environments.

Key Topics

• Scope and Application
  IEC 62271-106 covers a.c. contactors, contactor-based controllers, and motor-starters for indoor use on systems with voltages between 1 kV and 24 kV, up to 60 Hz. It includes three-pole devices for three-phase and single-pole devices for single-phase systems. The standard excludes two-pole contactors/starter agreements unless mutually arranged by manufacturers and users.

• Devices Covered

  • Direct-on-line starters
  • Reversing starters
  • Two-direction starters
  • Reduced voltage starters, including autotransformer, rheostatic, and reactor starters
    It excludes circuit-breaker-based starters and some specialized motor starters such as unbalanced rheostatic rotor starters.

• Ratings and Definitions
  The standard adds new rated voltages of 15, 17.5, and 24 kV and introduces definitions related to capacitor switching classes. Ratings for capacitor switching currents and starting duties of reduced voltage starters are detailed.

• Design and Construction
  Requirements for design, construction, and the integration of auxiliary equipment and operating devices are addressed to ensure reliable performance and safety.

• Testing and Performance
  Detailed type tests include making and breaking capacities, short-circuit current tests, capacitive current switching tests, and temperature rise evaluations. Tolerances on test quantities are specified to ensure consistent testing results.

• Safety and Environmental Impact
  The standard outlines safety requirements and the influence of products on the environment, supporting sustainable and safe operational practices.

• Documentation and Maintenance
  IEC 62271-106 provides guidance on the information needed for enquiries, tenders, and orders, as well as recommendations for transport, storage, installation, operation, and maintenance.

Applications

IEC 62271-106:2011 is essential for:

• Manufacturers developing high-voltage a.c. contactors, controlgear, and motor-starting equipment to ensure compliance with international safety, design, and performance requirements.
• Electrical engineers and system designers specifying equipment for medium voltage (1 kV to 24 kV) electrical power distribution, ensuring compatibility with rated voltage, frequency, and system requirements.
• Industrial facilities and utility companies employing reliable motor-starters and controllers to manage heavy electrical loads, enhance operational safety, and maintain system stability.
• Testing and certification bodies performing type and routine tests to verify compliance and product quality according to international standards.

This standard helps optimize motor control equipment for diverse high-voltage environments, contributing to improved energy efficiency, reduced downtime, and enhanced safety.

Related Standards

IEC 62271-106 references and is intended to be used in conjunction with:

• IEC 62271-1:2007 – General requirements for high-voltage switchgear and controlgear
• Standards governing electronic protective relays that have replaced the obsolete overload relay requirements formerly included in this standard
• Other parts within the IEC 62271 series that cover complementary aspects of high-voltage switchgear and controlgear technologies

For further definition of terms and electrical vocabulary, users are encouraged to consult Electropedia, the IEC’s online dictionary of electronic and electrical terms, ensuring consistency in interpretations and communications.

Keywords: IEC 62271-106, high-voltage switchgear, a.c. contactors, motor starters, contactor-based controllers, electrical standards, medium voltage equipment, switchgear testing, rated voltage 24 kV, IEC standards, motor controlgear, electrical safety, power distribution equipment.