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IEC 60947-6-1 Ed. 4.0 b:2026

Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment
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IEC 60947-6-1 Ed. 4.0 b:2026

Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment

IEC 60947-6-1 Ed. 4.0 b:2026

IEC 60947-6-1:2026 is available as IEC 60947-6-1:2026 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60947-6-1:2026 applies to transfer switching equipment (TSE), to be used in power systems for ensuring the continuity of the supply and allowing the energy management of the installation, by transferring a load between power supply sources, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC.

Specific requirements for bypass/isolation transfer switch equipment are given in Annex C, ATSE having closed transition capability are given in Annex D, stand-alone ATS controllers are given in Annex E, and TSE for electric driven fire pump controllers are given in Annex F.

It covers:

  • manually operated transfer switching equipment (MTSE);
  • remotely operated transfer switching equipment (RTSE);
  • automatic transfer switching equipment (ATSE), including the controller;
  • stand-alone ATS controllers;
  • bypass/isolation transfer switch equipment (BTSE);
  • ATSE having closed transition capability;
  • fire pump TSE.

It does not cover:

  • TSE configurations that are not fully manufacturer type tested or marked according to this document as a complete transfer switch;
  • auxiliary contacts (for guidance, see IEC 60947-5-1);
  • transfer switches used in explosive atmospheres (for guidance, see IEC 60079 (all parts));
  • embedded software design (for guidance, see IEC TR 63201);
  • cybersecurity aspects (for guidance, see IEC 63208);
  • TSE rated for direct-on-line starting asynchronous motor of design NE and HE, according to IEC 60034-12 (for guidance, see AC-3e utilisation category according to IEC 60947 4 1);
  • other types of TSE under consideration including overlapping neutral TSE, multi-source TSE (i.e. TSE with more than two sources of supply), TSE with load-shedding functions, bus-tie TSE, and hybrid TSE;
  • static transfer switches covered by IEC 62310 series.

This fourth edition cancels and replaces the third edition published in 2021. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:

  • clarification of scope;
  • clarification of terms and definitions;
  • Annex C for Bypass/Isolation Transfer Switch Equipment;
  • Annex D for ATSE having closed transition capability;
  • Annex E for Stand-alone ATS controller;
  • Annex F for TSE used with electric driven fire pump control equipment.
SDO IEC: International Electrotechnical Commission
Document Number IEC 60947
Publication Date Not Available
Language b - English & French
Page Count
Revision Level 4.0
Supercedes
Committee 121A
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