IEC 60947-6-2:2020

Overview

IEC 60947-6-2:2020 is an international standard published by the International Electrotechnical Commission (IEC) that specifies requirements for low-voltage switchgear and controlgear. This part 6-2 focuses on multiple function equipment, specifically control and protective switching devices (CPS) or equipment. It applies to CPS devices with main contacts designed for circuits with rated voltages up to 1,000 V AC or 1,500 V DC.

The standard addresses CPS devices that provide essential protective and control functions for circuits and motors. These devices are uniquely operated by automated control mechanisms rather than manual operation and are designed to ensure service continuity after over-current events. Additionally, CPS may include features such as isolation capabilities and communication functions.

The 2020 edition is the third edition, canceling and replacing the 2002 second edition and its 2007 amendment. It includes major technical revisions and alignment with related IEC standards to ensure harmonized requirements across device types.

Key Topics

• Scope and Application
  Covers CPS devices for low-voltage circuits with control and protection needs integral to motor and circuit management.

• Control and Protection Functions
  Devices operate automatically (not manual) to provide overload protection, short-circuit interruption, continuity of service, and additional isolation or communication functions.

• Rated Voltage and Current Parameters
  Specifies rated voltages (up to 1,000 V AC, 1,500 V DC), rated currents, making and breaking capacities, and short-circuit performance parameters ensuring device reliability under various electrical loads.

• Constructional Requirements
  Details on materials, components, terminals (including screwless type), protective earth provisions, enclosure requirements, and marking to ensure safety, durability, and ease of use.

• Performance and Testing
  Includes operational tests under no load, normal load, overload, and short-circuit conditions. Testing methodology covers temperature-rise, dielectric strength, electromagnetic compatibility (EMC), and endurance for various components.

• Harmonization with Related Standards
  Aligns with IEC 60947-1 (general requirements), IEC 60947-2 (circuit breakers), and IEC 60947-4-1 (contactors and motor starters), particularly on safety, EMC, operational testing, and functional safety data.

• Functional Safety and Reliability
  Introduces procedures for determining electromechanical CPS data relevant to safety applications, including reliability metrics and additional annexes covering load monitoring and electronic safety aspects.

Applications

IEC 60947-6-2:2020 standard is critical for industries and sectors relying on robust low-voltage control and protection equipment, including:

• Industrial Motor Control Systems
  Ensures motors are protected and controlled via reliable CPS devices, offering continuous service even after overcurrent conditions.

• Automation and Process Control
  CPS devices operating automatically within control circuits enhance safety and reduce manual intervention, supporting high-efficiency operations.

• Electrical Switchgear Manufacturing
  Manufacturers depend on this standard to design and test CPS products that meet global quality, safety, and interoperability requirements.

• Power Distribution and Control Panels
  Implementation in switchgear assemblies provides essential protective switching functions for circuits in residential, commercial, and industrial installations.

• Functional Safety Engineering
  The standard aids system integrators selecting CPS devices with verified reliability and designated safety performance levels for safety-critical applications.

Related Standards

• IEC 60947-1: Low-voltage switchgear and controlgear – General rules. Provides overarching principles for device classification, common testing, and safety requirements to which IEC 60947-6-2 aligns.

• IEC 60947-2: Circuit breakers. Shares harmonized testing procedures, especially for under-voltage relays, shunt releases, and coordination with short-circuit protective devices referenced in IEC 60947-6-2.

• IEC 60947-4-1: Contactors and motor-starters – Electromechanical contactors and motor-starters. Incorporates consistent short-circuit tests, operational reliability, and supplementary annexes for monitoring and electronic safety, referenced by IEC 60947-6-2.

Summary

IEC 60947-6-2:2020 is a comprehensive technical standard establishing requirements for multiple function control and protective switching devices in low-voltage electrical systems. It supports enhanced device safety, reliability, and operational efficiency through harmonized testing, constructional mandates, and functional safety provisions. Companies involved in the design, manufacturing, and application of CPS devices in industrial and commercial sectors should adhere to this standard to ensure compliance with international best practices and achieve optimal performance and safety in low-voltage switchgear assemblies.

Keywords: IEC 60947-6-2, low-voltage switchgear, controlgear standard, control and protective switching devices, CPS, motor protection, electrical safety, low-voltage circuits, functional safety, electrical testing, EMC requirements, switchgear manufacturing.