IEC 60947-6-1:2026

Overview

IEC 60947-6-1:2026 is the international standard for low-voltage switchgear and controlgear, specifically addressing multiple function equipment - transfer switching equipment (TSE). Published by the International Electrotechnical Commission (IEC), this fourth edition standard supersedes the previous (2021) edition and is available in a Redline version (IEC 60947-6-1:2026 RLV) that highlights all technical changes.

The scope of IEC 60947-6-1:2026 covers transfer switching equipment used in power systems up to 1,000 V AC or 1,500 V DC, enabling load transfer between power supply sources for improved continuity of supply and effective energy management. The standard establishes requirements and testing methods for various types of TSE, including manual, remote, automatic, and specialized transfer switches.

Key Topics

IEC 60947-6-1:2026 includes comprehensive guidelines and specifications for:

• Types of Transfer Switching Equipment:

  • Manually operated TSE (MTSE)
  • Remotely operated TSE (RTSE)
  • Automatic transfer switching equipment (ATSE), including controllers
  • Stand-alone automatic transfer switch (ATS) controllers
  • Bypass/isolation transfer switch equipment (BTSE)
  • ATSE with closed transition functionality
  • TSE for fire pump control applications

• Key technical content:

  • Product characteristics and performance criteria
  • Classification and utilization categories
  • Testing requirements (type, routine, and environmental tests)
  • Marking, installation, operation, and maintenance instructions
  • Constructional and dielectric properties
  • Electromagnetic compatibility (EMC) requirements

• Annexes addressing specific equipment:

  • Annex C: Bypass/isolation transfer switch requirements
  • Annex D: Closed transition ATSE
  • Annex E: Stand-alone ATS controllers
  • Annex F: TSE for electric driven fire pump controllers

• Clarifications in the 2026 edition:

  • Scope and application definitions
  • Updated terminology and definitions
  • Enhanced coverage of new and emerging TSE categories

Applications

IEC 60947-6-1:2026 is essential for manufacturers, design engineers, facility managers, system integrators, and maintenance professionals involved in:

• Critical infrastructure and industrial installations needing secure, reliable transfer between primary and backup power sources
• Data centers, hospitals, and commercial buildings where power continuity is vital
• Electrical panels and switchboards integrating transfer switching as part of their functionality
• Fire safety systems employing transfer switches for electric driven fire pump control
• Projects requiring compliance with international standards for export, certification, or regulatory approval

Implementing TSE according to IEC 60947-6-1:2026 ensures:

• Enhanced safety and operational reliability
• Compliance with international guidelines for product marking, testing, and performance
• Effective energy management in low-voltage power systems

Related Standards

IEC 60947-6-1:2026 is part of the broader IEC 60947 series, which covers low-voltage switchgear and controlgear. For enhanced compliance and system integration, related standards include:

• IEC 60947-1: General rules for low-voltage switchgear and controlgear
• IEC 60947-5-1: Auxiliary contacts for control circuits
• IEC 60079 (all parts): Equipment for explosive atmospheres
• IEC 62310: Static transfer switch equipment
• IEC TR 63201: Embedded software design in electrical equipment
• IEC 63208: Cybersecurity aspects in electrical control systems
• IEC 60034-12: Asynchronous motors and direct-on-line starting categories

For organizations committed to safety, energy continuity, and compliance, staying up to date with IEC 60947-6-1:2026 and its related standards is fundamental for the design, installation, and ongoing management of advanced low-voltage switching solutions.