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Abstract

Status: Published
Publication Date: 15-Mar-2026

ICS: 29.130.20 - Low voltage switchgear and controlgear

Technical Committee: SC 121A - Low-voltage switchgear and controlgear

Current Stage: PPUB - Publication issued
Start Date: 16-Mar-2026
Completion Date: 23-Apr-2026

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IEC 60947-4-2:2020/AMD1:2024/COR1:2026 - Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters - Page 1 preview

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IEC 60947-4-2:2020/AMD1:2024/COR1:2026 - Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters

Release Date:16-Mar-2026

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Corrects: IEC 60947-4-2:2020/AMD1:2024 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters
Effective Date: 06-Feb-2026

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Standard

IEC 60947-4-2:2020/AMD1:2024/COR1:2026 - Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters

Release Date:16-Mar-2026

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Frequently Asked Questions

What is IEC 60947-4-2:2020/AMD1:2024/COR1:2026?

IEC 60947-4-2:2020/AMD1:2024/COR1:2026 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters". This standard covers: Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters

What is the scope of IEC 60947-4-2:2020/AMD1:2024/COR1:2026?

Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters

What ICS categories does IEC 60947-4-2:2020/AMD1:2024/COR1:2026 belong to?

IEC 60947-4-2:2020/AMD1:2024/COR1:2026 is classified under the following ICS (International Classification for Standards) categories: 29.130.20 - Low voltage switchgear and controlgear. The ICS classification helps identify the subject area and facilitates finding related standards.

What standards are related to IEC 60947-4-2:2020/AMD1:2024/COR1:2026?

IEC 60947-4-2:2020/AMD1:2024/COR1:2026 has the following relationships with other standards: It is inter standard links to IEC 60947-4-2:2020/AMD1:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

How can I access IEC 60947-4-2:2020/AMD1:2024/COR1:2026?

IEC 60947-4-2:2020/AMD1:2024/COR1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)

IEC 60947-4-2:2020/AMD1:2024/C...

INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
IEC 60947-4-2 IEC 60947-4-2
Edition 4.0 2020-11 Édition 4.0 2020-11

Amendment 1 - Low-voltage switchgear and Amendement 1 - Appareillage à
controlgear - basse tension -
Part 4-2: Contactors and motor-starters - Partie 4-2 : Contacteurs et démarreurs de
Semiconductor motor controllers, starters and moteurs - Gradateurs, démarreurs et
soft-starters démarreurs progressifs à semiconducteurs de
moteurs
CO RRI G E NDUM 1
Corrections to the French version appear after the English text.
Les corrections à la version française sont données après le texte anglais.

6.2 Marking
Replace the first paragraph by the following:
"Replace, in the third paragraph "k)" with: "j)" and "q)" with "p)".
Delete, in the third paragraph: "time-current characteristics (or range of characteristics) may
be provided in the
...

IEC

IEC 60947-5-3:2026(Main)

Low-voltage switchgear and controlgear - Part 5-3: Control circuit devices and switching elements - Requirements for proximity devices with defined behaviour under fault conditions (PDDB)

IEC 60947-5-3:2026 provides additional requirements to those given in IEC 60947-5-2 and IEC 60947-5-1:2024, Annex D (reed contact magnetic switches). It addresses the fault performance aspects of proximity devices with a defined behaviour under fault conditions (PDDB). It does not address any other characteristics that can be required for specific applications.
This document does not apply to protective equipment to directly detect the presence of persons, that are covered by the IEC 61496 series or IEC TS 62998 series.
NOTE 1 A PDDB device can be used to detect indirectly the presence of a person, for example by detecting the position of a platform on which the operator stands (example, garbage trucks).
This document does not specify requirements for the analogue output of PDDB, if any.
This document does not deal with any specific requirements on acoustic noise as the noise emission of proximity devices is not considered to be a relevant hazard.
A PDDB product is intended to be used as sensing subsystem of a safety related control system according to IEC 62061 or ISO 13849-1. Depending on construction principles and complexity, this document is based on product development of the IEC 61508 series to meet the product specific requirements of one or more of the following:
– IEC 61508 series;
– IEC 62061;
– ISO 13849 series.
NOTE 2 The Functional safety device type classification regarding functional safety correlates with IEC 62683-2-3.
This document includes requirements for PDDB when designed for use as part of an interlocking device according to ISO 14119.
This document does not consider aspects of:
– software updates and self-evolving behaviour;
– explosive atmospheres.
This third edition cancels and replaces the second edition published in 2013. This edition constitutes a technical revision.
This third edition includes the following significant technical changes with respect to the previous edition:
a) Update of the scope, refined fault performance aspects and relation to standards of functional safety.
b) The ‘safe state’ is generally determined as ‘OFF-state’ (see 3.1.8).
c) Update of EMC requirements in 8.2.6 with references to IEC 60947-5-2:2019 for acceptance criteria A, B and C and requirements of Table 17 for acceptance criterion DS.
d) Interface types for binary interfaces are introduced (see 4.6.2 and Annex B).
e) Functional safety device types according to ISO 13849-1:2023 Annex O (see 4.9).
f) Interlocking device type and coding level according to ISO 14119 are adapted (see 4.10 and 4.11).
g) The operating modes target present (4.12.2) and target absent (4.12.3) are introduced.
h) The ‘switching distance’ replaces the terms ‘release’ and ‘operating’. The behaviour of the PDDB is described according to the operating mode (4.12).
i) The context and verification of the switching distances are considered according to ISO/IEC Guide 98-3:2008 (GUM) and IEC TR 63649 (see 8.2.1.3 and 9.4.2).
j) Requirements for electrical equipment class III are refined.
k) The risk time is replaced with the safety response time (3.1.11).
l) Annex A gives a new example of safety related control system.
m) The test sequences (see 9.3.1) are updated for the specific behaviour of a PDDB.

Standard
177 pages
English and French language
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Standard
177 pages
English and French language
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18-Aug-2026
29.130.20
SC 121A

IEC

IEC 60947-10:2026(Main)

Low-voltage switchgear and controlgear - Part 10: Semiconductor circuit-breakers

IEC 60947-10:2026 applies to semiconductor circuit-breakers with a rated voltage up to 1 000 V AC or 1 500 V DC, intended to be installed and operated by instructed or skilled persons.
This document covers the following different types:
- semiconductor circuit-breakers (SCCBs) having semiconductor switching elements and, for isolation function, mechanical isolation contacts connected in series;
- semiconductor hybrid circuit-breakers (SCHCBs) having semiconductor switching elements and mechanical switching elements in parallel and in addition, for isolation function, mechanical isolation contacts connected in series.
In this document, where the term "circuit-breaker" only is used, it applies to both types.
This document applies regardless of the rated currents, the method of construction or the proposed applications of the circuit-breakers.
The object of this document is to state:
a) the characteristics of circuit-breakers;
b) the conditions with which circuit-breakers shall comply with reference to:
1) operation and behaviour in normal service;
2) operation and behaviour under specific abnormal circuit conditions (e.g. overload or short-circuit);
3) dielectric properties;
4) requirements on electromagnetic compatibility;
c) tests intended for confirming that these conditions have been met and the methods to be adopted for these tests;
d) information to be marked on or given with the circuit-breakers.

Standard
250 pages
English and French language
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Standard
250 pages
English and French language
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11-May-2026
29.130.20
SC 121A

IEC

IEC 60947-6-1:2026(Main)

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

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.

Standard
97 pages
English language
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Standard
195 pages
English language
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Standard
104 pages
French language
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IEC

IEC 60947-5-5:2026(Main)

Low-voltage switchgear and controlgear - Part 5-5: Control circuit devices and switching elements - Electrical emergency stop device with mechanical latching function

IEC 60947-5-5:2026 This edition includes the following significant technical changes with respect to the previous edition:
a) re-shaping the document with the clause numbers and names to be in line with other documents of the 60947 series;
b) review of the test method to reasonably determine that the latch mechanism meets the requirements of the document;
c) new Annex B for special requirements for illuminated push-button type emergency stop devices, including the reference to a function to distinguish between "active and inactive" by changing the colour of the push-button depending on the illumination.
This part of IEC 60947-5 provides detailed specifications relating to the electrical and mechanical construction of emergency stop devices with mechanical latching function and to their testing.
This document is applicable to electrical control circuit devices and switching elements which are used to initiate an emergency stop signal. Such devices can be provided with their own enclosure and will be installed according to the product documentation.
This document does not apply to:
– emergency stop devices for non-electrical control applications, for example hydraulic or pneumatic;
– emergency stop devices without mechanical latching function.
An emergency stop device conforming to this document can also be used as part of an emergency switching off means in compliance with IEC 60364-5-53.
NOTE See also IEC 60204-1:2016 and IEC 60204-1:2016/AMD1:2021, 9.2.3.4.
This document does not address specific requirements on acoustic noise as the noise emission of electrical emergency stop devices with mechanical latching function is not considered to be a relevant hazard.
This second edition cancels and replaces the first edition published in 1997. This edition constitutes a technical revision.

Standard
24 pages
English language
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Standard
25 pages
French language
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Standard
49 pages
English and French language
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IEC

IEC 60947-3:2020/AMD1:2025(Amendment)

Amendment 1 - Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units

Standard
54 pages
English and French language
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IEC

IEC 60947-3:2020(Main)

Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units

IEC 60947-3:2020 applies to switches, disconnectors, switch-disconnectors and fuse-combination units and their dedicated accessories to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 1 000 V AC or 1 500 V DC. This fourth edition cancels and replaces the third edition published in 2008, Amendment 1:2012 and Amendment 2:2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- addition of critical load current tests for DC switches (see 9.3.9);
- addition of requirements for a conditional short-circuit rating for disconnectors, switches, and switch-disconnectors protected by circuit-breakers (see 9.3.7.2);
- addition of new categories for high-efficiency motors switching (see Annex A);
- addition of new Annex E for connection to aluminium conductors;
- addition of new Annex F for power losses measurement.
The contents of the corrigendum of October 2021 have been included in this copy.

Standard
217 pages
English language
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Standard
190 pages
English and French language
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IEC

IEC 60947-7-1:2025(Main)

Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for copper conductors

IEC 60947-7-1:2025 specifies requirements for terminal blocks and test disconnect terminal blocks according to Annex D with screw-type or screw-less-type clamping units primarily intended for industrial or similar use and to be fixed to a support to provide electrical and mechanical connection between copper conductors. It applies to terminal blocks intended to connect round copper conductors, with or without special preparation, having a cross-section between 0,05 mm2/30 AWG and 300 mm2/600 kcmil, intended to be used in circuits of a rated voltage not exceeding 1 000 V AC up to 1 000 Hz or 1 500 V DC. The tests on terminal blocks are made with AC or DC supply as required in relevant clauses of this document.
This fourth edition cancels and replaces the third edition published in 2009. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Scope extension for smaller conductor cross-sections;
b) Implementation of a contact pressure via insulation material (CoPI) test;
c) Introduction of new informative Annex E for larger cross-sections;
d) Reorganisation of all tables merged into two tables for electrical and mechanical values;
e) Implementation of AWG-sizes conductor types as an equivalent type of metric conductor with examples in Annex C;
f) Reorganisation of Annex D test disconnect terminal blocks to enhance readability;
g) Introduction of new informative Annex A for main characteristics of terminal blocks.

Standard
99 pages
English and French language
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14-Apr-2025
29.130.20
SC 121A

IEC

IEC 60947-4-2:2020(Main)

Low-voltage switchgear and controlgear – Part 4-2: Contactors and motor-starters – Semiconductor motor controllers, starters and soft-starters

IEC 60947-4-2:2020 applies to semiconductor motor controllers, starters and soft-starters which can include a series mechanical switching device, intended to be connected to circuits the rated voltage of which does not exceed 1 000 V AC.
This fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- scope exclusions;
- editorial correction of notes and hanging paragraphs;
- reference to IEC 62683-1;
- safety aspects related to:
- general aspects;
- limited energy circuits;
- electronic circuits;
- mention of dedicated wiring accessories;
- power consumption measurement;
- alignment to IEC 60947-1:2020.

Standard
228 pages
English language
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Standard
230 pages
English and French language
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04-Nov-2024
29.130.20
SC 121A

IEC

IEC 60947-4-2:2020/AMD1:2024(Amendment)

Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters

CORRECTED VERSION 2026-03
The content of the corrigendum 1 (2026-03) has been included in this copy.

Standard
32 pages
English and French language
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04-Nov-2024
29.130.20
SC 121A

IEC

IEC 60947-2:2024(Main)

Low-voltage switchgear and controlgear - Part 2: Circuit-breakers

IEC 60947-2:2024 applies to circuit-breakers, intended to be installed and operated by instructed or skilled persons, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC; it also contains additional requirements for integrally fused circuit-breakers.
This document also applies to circuit-breakers with ratings at or below 1 000 V AC, additionally having one or more ratings above 1 000 V AC but not exceeding 1 500 V AC.
This sixth edition cancels and replaces the fifth edition published in 2016 and its Amendment 1: 2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) suitability for isolation (see Clause 1);
b) removal of the classification according to the interrupting medium, according to the design, according to the suitability for isolation (see Clause 4);
c) adjustment of current settings with an external device connectable to the release (see 5.7.3);
d) requirements for circuits with protective separation (see 8.2.3.8);
e) additional tests for ground-fault overcurrent releases (see 9.3.4.2.5);
f) additional tests concerning dielectric properties in tripped position (see 9.3.4.3);
g) use of DC voltage for dielectric tests (see 9.3.4.6.2 and 9.4.6);
h) tests of individual pole breaking capacity under phase-to-neutral AC voltage (see 9.3.11);
i) improvement of measurement of power loss in Annex G;
j) changes in EMC tests (see Annex J);
k) introduction of CBI class W in Annex L.

Standard
863 pages
English language
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Standard
565 pages
English and French language
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09-Oct-2024
29.130.20
SC 121A

General Information

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IEC 60947-4-2:2020/AMD1:2024/COR1:2026 - Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters

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IEC 60947-4-2:2020/AMD1:2024/COR1:2026 - Corrigendum 1 - Amendment 1 - Low-voltage switchgear and controlgear - Part 4-2: Contactors and motor-starters - Semiconductor motor controllers, starters and soft-starters

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