IEC 60947-6-1:2026 RLV

OVERVIEW

IEC 60947-6-1:2026 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its 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.

COMMENTS

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