EN IEC 60947-10:2026

• Abstract:

  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.

• Status: Published
• Publication Date: 02-Jul-2026
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: CLC/TC 121A - Low-voltage switchgear and controlgear
• Drafting Committee: IEC/SC 121A - Low-voltage switchgear and controlgear
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 03-Jul-2026
• Due Date: 31-Jan-2024
• Completion Date: 03-Jul-2026
• Ref Project: SIST EN IEC 60947-10:2026 - Low-voltage switchgear and controlgear - Part 10: Semiconductor circuit-breakers (IEC 60947-10:2026)

• Refers: EN IEC 61000-4-3:2020 - Electromagnetic compatibility (EMC) - Part 4-3 : Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test
• Effective Date: 09-Jun-2026
• Refers: EN IEC 55011:2025 - Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
• Effective Date: 09-Jun-2026
• Refers: EN 61709:2017 - Electric components - Reliability - Reference conditions for failure rates and stress models for conversion
• Effective Date: 09-Jun-2026
• Refers: EN IEC 60068-2-30:2025 - Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
• Effective Date: 09-Jun-2026
• Refers: EN IEC 60749-23:2026 - Semiconductor devices - Mechanical and climatic test methods - Part 23: High temperature operating life
• Effective Date: 09-Jun-2026
• Refers: EN IEC 60664-1:2020 - Insulation coordination for equipment within low-voltage supply systems - Part 1: Principles, requirements and tests
• Effective Date: 09-Jun-2026
• Refers: EN IEC 60068-2-14:2023 - Environmental testing - Part 2-14: Tests - Test N: Change of temperature
• Effective Date: 09-Jun-2026
• Refers: EN 61508-3:2010 - Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3: Software requirements
• Effective Date: 09-Jun-2026
• Refers: EN IEC 60947-2:2025 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
• Effective Date: 09-Jun-2026
• Refers: EN 61000-4-5:2014 - Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test
• Effective Date: 09-Jun-2026
• Refers: EN IEC 61000-4-11:2020 - Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests for equipment with input current up to 16 A per phase
• Effective Date: 09-Jun-2026
• Refers: EN 61000-4-34:2007 - Electromagnetic compatibility (EMC) - Part 4-34: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests for equipment with mains current more than 16 A per phase
• Effective Date: 09-Jun-2026
• Refers: EN 61000-4-29:2000 - Electromagnetic compatibility (EMC) - Part 4-29: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests
• Effective Date: 09-Jun-2026
• Refers: EN 61508-1:2010 - Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements
• Effective Date: 09-Jun-2026
• Refers: EN IEC 60695-2-11:2021 - Fire hazard testing - Part 2-11: Glowing/hot-wire based test methods - Glow-wire flammability test method for end products (GWEPT)
• Effective Date: 09-Jun-2026

Overview

EN IEC 60947-10:2026, published by CLC, specifies requirements for semiconductor circuit-breakers (SCCBs) and semiconductor hybrid circuit-breakers (SCHCBs) for use in low-voltage switchgear and controlgear assemblies. This standard applies to devices with rated voltages up to 1,000 V AC or 1,500 V DC and is intended for installation and operation by instructed or skilled persons. It details characteristics, operational behaviors, dielectric properties, electromagnetic compatibility, testing, and marking requirements for these types of circuit-breakers, regardless of their rated currents, methods of construction, or proposed applications.

Semiconductor circuit-breakers utilize modern solid-state technology to provide rapid and reliable interruption of electrical circuits, while hybrid versions combine both mechanical and semiconductor components for enhanced performance and flexibility.

---

Key Topics

• Scope of Application
  • SCCBs and SCHCBs up to 1,000 V AC/1,500 V DC
  • Devices installed by trained personnel in a variety of low-voltage power systems
• Classification
  • By type, operation mechanism, fault response, isolation method, installation, and communication
  • Special focus on directional protection and surge withstand capabilities
• Characteristics
  • Electrical ratings: voltage, current, frequency, duty cycle, short-circuit capacity
  • Integration with auxiliary and control circuits
  • Isolation function and safety features for the operator
  • Degree of protection provided by enclosure (IP rating)
• Performance Requirements
  • Normal and abnormal service conditions, including overload and short-circuit performance
  • Dielectric properties and temperature-rise limitations
  • Electromagnetic compatibility (EMC) and environmental considerations
• Testing Requirements
  • Type, routine, and special tests for confirming compliance
  • Sequences focused on performance, safety, mechanical operation, and EMC
• Product Information and Marking
  • Clear marking and product information to ensure proper selection, installation, and maintenance
  • Instructions provided for installation, operation, maintenance, decommissioning, and dismantling

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Applications

EN IEC 60947-10:2026 supports a wide range of low-voltage electrical infrastructure across multiple sectors where reliable circuit protection and fast switching are critical. Key application areas include:

• Power Distribution Panels: Rapid circuit interruption to protect electrical distribution systems in commercial and industrial settings
• Renewable Energy Systems: Used in photovoltaic (PV) and battery energy storage systems (BESS), where fast disconnection and current direction control are essential
• Electric Vehicle Charging: Ensures safety and reliability in AC and DC charging solutions
• Industrial Automation: Integrated within motor control centers and process industry equipment for dependable power management
• Critical Infrastructure: Data centers, telecommunications, and transport networks benefit from the high speed and reliability of SCCBs and SCHCBs

The standard also addresses contemporary needs for digital communication, software upgrades, and integration with programmable logic controllers (PLCs), making it relevant for modern smart grid and Industry 4.0 environments.

---

Related Standards

• IEC 60947-1: General rules for low-voltage switchgear and controlgear
• IEC 60947-2: Circuit-breakers
• IEC 60947-3: Switches, disconnectors, switch-disconnectors, and fuse-combination units
• IEC 61643 Series: Low-voltage surge protective devices
• IEC 61000 Series: Electromagnetic compatibility (EMC) standards

EN IEC 60947-10:2026 complements these core standards by addressing the specific characteristics and requirements of semiconductor and hybrid circuit-breakers, supporting the further evolution of safe, efficient, and digital-ready low-voltage electrical installations.

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Keywords: low-voltage switchgear, controlgear, semiconductor circuit-breakers, SCCB, SCHCB, industrial safety, power distribution, IEC 60947-10, electromagnetic compatibility, short-circuit protection, smart grid, CLC, electrical standards

SLOVENSKI STANDARD
01-september-2026
Nizkonapetostne stikalne in krmilne naprave - 10. del: Polprevodniški odklopniki
(IEC 60947-10:2026)
Low-voltage switchgear and controlgear - Part 10: Semiconductor circuit-breakers (IEC
60947-10:2026)
Niederspannungsschaltgeräte – Teil 10: Halbleiter-Leistungsschalter (IEC 60947-
10:2026)
Appareillage à basse tension - Partie 10: Disjoncteurs à semi-conducteurs (IEC 60947-
10:2026)
Ta slovenski standard je istoveten z: EN IEC 60947-10:2026
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60947-10

NORME EUROPÉENNE
EUROPÄISCHE NORM July 2026
ICS 29.130.20
English Version
Low-voltage switchgear and controlgear - Part 10:
Semiconductor circuit-breakers
(IEC 60947-10:2026)
Appareillage à basse tension - Partie 10: Disjoncteurs à Niederspannungsschaltgeräte - Teil 10: Halbleiter-
semiconducteurs Leistungsschalter
(IEC 60947-10:2026) (IEC 60947-10:2026)
This European Standard was approved by CENELEC on 2026-06-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-10:2026 E

European foreword
The text of document 121A/712/FDIS, future edition 1 of IEC 60947-10, prepared by SC 121A “Low-
voltage switchgear and controlgear” of IEC/TC 121 “Switchgear and controlgear and their assemblies
for low voltage” was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-07-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-07-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 60947-1:2021.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60947-10:2026 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60335-1:2020 NOTE Approved as EN IEC 60335-1:2023 (not modified) +A11:2023
IEC 60947-4-1:2023 NOTE Approved as EN IEC 60947-4-1:2025 (not modified)
IEC 61000-4-13 NOTE Approved as EN 61000-4-13
IEC 61508-1:2010 NOTE Approved as EN 61508-1:2010 (not modified)
IEC/TR 63201 NOTE Approved as CLC IEC/TR 63201
IEC 63208 NOTE Approved as EN IEC 63208
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-6 - Environmental testing - Part 2–6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC 60068-2-14 - Environmental testing - Part 2–14: Tests - EN IEC 60068-2-14 -
Test N: Change of temperature
IEC 60068-2-30 - Environmental testing - Part 2–30: Tests - EN IEC 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60664-1 2020 Insulation coordination for equipment EN IEC 60664-1 2020
within low-voltage supply systems - Part 1:
Principles, requirements and tests
IEC 60695-2-11 2021 Fire hazard testing - Part 2–11: EN IEC 60695-2-11 2021
Glowing/hot-wire based test methods -
Glow-wire flammability test method for end
products (GWEPT)
IEC 60747-9 - Semiconductor devices - Part 9: Discrete - -
devices - Insulated-gate bipolar transistors
(IGBTs)
IEC 60749-5 - Semiconductor devices - Mechanical and EN IEC 60749-5 -
climatic test methods - Part 5: Steady-state
temperature humidity bias life test
IEC 60749-23 - Semiconductor devices - Mechanical and EN IEC 60749-23 -
climatic test methods - Part 23: High
temperature operating life
IEC 60749-25 - Semiconductor devices - Mechanical and EN 60749-25 -
climatic test methods - Part 25:
Temperature cycling
IEC 60749-34 - Semiconductor devices - Mechanical and EN 60749-34 -
climatic test methods - Part 34: Power
cycling
IEC 60947-1 2020 Low-voltage switchgear and controlgear - EN IEC 60947-1 2021
Part 1: General rules
IEC 60947-2 2024 Low-voltage switchgear and controlgear - EN IEC 60947-2 2025
Part 2: Circuit-breakers
IEC 61000-3-2 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-3-2 -
3–2: Limits - Limits for harmonic current
emissions (equipment input current ≤ 16 A
per phase)
IEC 61000-3-3 - Electromagnetic compatibility (EMC) - Part EN 61000-3-3 -
3–3: Limits - Limitation of voltage changes,
voltage fluctuations and flicker in public
low-voltage supply systems, for equipment
with rated current ≤ 16 A per phase and
not subject to conditional connection
IEC 61000-4-2 2025 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-2 2025
4–2: Testing and measurement techniques
- Electrostatic discharge immunity test
IEC 61000-4-3 2020 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-3 2020
4–3: Testing and measurement techniques
- Radiated, radio-frequency,
electromagnetic field immunity test
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - Part EN 61000-4-4 2012
4–4: Testing and measurement techniques
- Electrical fast transient/burst immunity
test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - Part EN 61000-4-5 2014
4–5: Testing and measurement techniques
- Surge immunity test
IEC 61000-4-6 2023 Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-6 2023
4–6: Testing and measurement techniques
- Immunity to conducted disturbances,
induced by radio-frequency fields
IEC 61000-4-11 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-4-11 -
4–11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current up to 16 A per phase
IEC 61000-4-29 - Electromagnetic compatibility (EMC) - Part EN 61000-4-29 -
4–29: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations on d.c.
input power port immunity tests
IEC 61000-4-34 - Electromagnetic compatibility (EMC) - Part EN 61000-4-34 -
4–34: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current more than 16 A per phase
IEC 61508-1 2010 Functional safety of EN 61508-1 2010
electrical/electronic/programmable
electronic safety-related systems - Part 1:
General requirements
IEC 61508-3 2010 Functional safety of EN 61508-3 2010
electrical/electronic/programmable
electronic safety-related systems - Part 3:
Software requirements
IEC 61709 - Electric components - Reliability - EN 61709 -
Reference conditions for failure rates and
stress models for conversion
IEC 62475 2010 High-current test techniques - Definitions EN 62475 2010
and requirements for test currents and
measuring systems
CISPR 11 2024 Industrial, scientific and medical equipment EN IEC 55011 2025
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
AEC-Q101 Failure mechanism based stress test
qualification for discrete semiconductors in
automotive applications
JEDEC JESD47 Stress-test-driven qualification of
integrated circuit
UL 991:2024 Tests for Safety-Related Controls
Employing Solid-State Devices
IEC 60947-10 ®
Edition 1.0 2026-05
INTERNATIONAL
STANDARD
Low-voltage switchgear and controlgear -
Part 10: Semiconductor circuit-breakers
ICS 29.130.20  ISBN 978-2-8327-1172-9

IEC 60947-10:2026-05(en)
IEC 60947-10:2026 © IEC 2026
CONTENTS
FOREWORD . 8
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 12
4 Classification . 15
4.1 According to type . 15
4.2 According to the operating mechanism method of the isolation contacts . 15
4.3 According to the position after tripping . 15
4.4 According to the method of controlling the operation . 16
4.5 According to the provision for software upgrade of embedded software . 16
4.6 According to the method of installation. 16
4.7 According to communication method . 16
4.8 According to the behaviour in case of loss of control circuit supply when the
circuit-breaker is in closed position . 16
4.9 According to the source of control circuit supply . 16
4.10 According to the degree of protection provided by the enclosure . 16
4.11 For DC circuit-breakers, according to the direction of current flow and
protection. 16
4.12 According to the existence of a standby state . 17
4.13 According to the integral cooling method of the breaker . 17
4.14 According to the surge withstand capability . 17
4.15 According to the single-pole voltage rating U for DC applications . 17
e1
5 Characteristics of circuit-breaker . 17
5.1 Summary of characteristics . 17
5.2 Type of circuit-breaker . 17
5.3 Rated and limiting values of the main circuit . 17
5.3.1 General . 17
5.3.2 Rated voltages . 18
5.3.3 Currents . 19
5.3.4 Rated frequency . 19
5.3.5 Rated duty . 19
5.3.6 Short-circuit characteristics . 19
5.3.7 Surge withstand capability . 21
5.3.8 Individual pole inductance . 24
5.4 Control circuits . 24
5.5 Auxiliary circuits . 24
5.6 Releases . 25
5.6.1 Release functions . 25
5.6.2 Characteristics . 25
5.6.3 Current setting of overcurrent releases . 26
5.6.4 Tripping time setting of overcurrent releases . 27
6 Product information . 27
6.1 Nature of the information . 27
6.2 Marking . 27
6.3 Instructions for installation, operation and maintenance instructions,
decommissioning and dismantling . 27
7 Normal service, mounting and transport conditions . 28
IEC 60947-10:2026 © IEC 2026
7.1 Normal service conditions . 28
7.1.1 Ambient air temperature . 28
7.1.2 Altitude . 28
7.1.3 Atmospheric conditions . 28
7.1.4 Shock and vibrations . 28
7.2 Conditions during transport and storage . 28
7.3 Mounting . 28
8 Constructional and performance requirements . 28
8.1 Constructional requirements . 28
8.1.1 General . 28
8.1.2 Withdrawable circuit-breakers . 29
8.1.3 Requirements for isolation function . 30
8.1.4 Clearances and creepage distances . 30
8.1.5 Requirements for the safety of the operator . 30
8.1.6 List of construction breaks . 30
8.1.7 Additional requirements for circuit-breakers provided with a neutral or
mid-point pole . 30
8.1.8 Digital inputs and outputs for use with programmable logic controllers
(PLCs) . 31
8.1.9 Indication of the closed position . 31
8.1.10 Indication of the standby position . 31
8.1.11 Indication of tripping . 31
8.1.12 Fault and abnormal conditions of electronic components . 31
8.1.13 Reliability of the breaking capability function . 31
8.2 Performance requirements . 31
8.2.1 Operating conditions . 31
8.2.2 Temperature rise . 33
8.2.3 Dielectric properties . 34
8.2.4 Ability to make and break under no load, normal load and overload
conditions . 34
8.2.5 Ability to make and break under short-circuit conditions . 35
8.2.6 Requirements for isolation function . 35
8.2.7 Requirements for behaviour in case of loss of control circuit supply . 35
8.3 Electromagnetic compatibility (EMC) . 36
9 Tests . 36
9.1 Kind of tests . 36
9.1.1 General . 36
9.1.2 Type tests. 36
9.1.3 Routine tests . 36
9.1.4 Special tests . 36
9.2 Compliance with constructional requirements . 36
9.2.1 General . 36
9.2.2 Breakdown of components . 36
9.2.3 Components tests . 37
9.3 Type tests . 38
9.3.1 General . 38
9.3.2 Test sequences . 38
9.3.3 General test conditions . 40
9.3.4 Test sequence I: General performance characteristics . 50
IEC 60947-10:2026 © IEC 2026
9.3.5 Test sequence II: Rated short-circuit breaking capacity . 63
9.3.6 Test sequence III: Rated individual pole ultimate short-circuit breaking
capacity at phase-to-neutral AC voltage . 64
9.3.7 Test sequence IV: Maximum admissible short-circuit current rate of rise. 66
9.3.8 Test sequence V: Additional verifications for circuit-breakers dependent
on line voltage (4.9 b)) or on an external voltage (4.9 c)) . 67
9.3.9 Test sequence VI: Rated individual pole ultimate short-circuit breaking
capacity at individual pole rated operational voltage U for DC circuit-
e1
breakers . 69
9.4 Routine tests . 70
9.4.1 General . 70
9.4.2 Mechanical operation tests . 70
9.4.3 Verification of the calibration of overcurrent releases . 70
9.4.4 Verification of the operation of undervoltage and shunt releases . 71
9.4.5 Dielectric tests . 71
9.4.6 Test for the verification of clearances less than those corresponding to
case A of IEC 60947-1:2020, Table 13 . 72
9.5 Special tests – Damp heat, salt mist, vibration and shock . 72
Annex A (normative) Coordination between a circuit-breaker and another short-circuit
protective device associated in the same circuit . 79
Annex B (normative) Circuit-breakers incorporating residual current protection . 80
Annex C (normative) Individual pole short-circuit test sequence for AC circuit-breakers . 81
C.1 General . 81
C.2 Test of individual pole short-circuit breaking capacity. 81
C.3 Verification of dielectric withstand, the leakage current and the standby
current . 81
C.4 Verification of overload releases . 81
Annex D (informative) Void . 82
Annex E (informative) Void . 83
Annex F (normative) Additional environmental tests . 84
F.1 General . 84
F.2 List of tests . 84
F.2.1 General . 84
F.2.2 Electromagnetic compatibility (EMC) tests . 84
F.2.3 Suitability for multiple frequencies . 86
F.2.4 Dry heat test . 86
F.2.5 Damp heat test . 86
F.2.6 Temperature variation cycles at a specified rate of change . 86
F.3 General test conditions . 86
F.3.1 General . 86
F.3.2 Conditions for immunity tests . 86
F.3.3 Conditions for emission tests . 87
F.4 Immunity tests . 87
F.4.1 Harmonic currents . 87
F.4.2 Electrostatic discharges . 89
F.4.3 Radiated RF electromagnetic fields . 89
F.4.4 Electrical fast transient/burst (EFT/B) . 89
F.4.5 Surges . 89
F.4.6 Conducted disturbances induced by RF fields (common mode) . 91
IEC 60947-10:2026 © IEC 2026
F.4.7 Current dips . 91
F.4.8 Voltage dips and interruptions . 92
F.5 Emission tests . 93
F.5.1 Harmonics . 93
F.5.2 Voltage fluctuations . 93
F.5.3 Conducted RF disturbances (150 kHz to 30 MHz) . 93
F.5.4 Radiated RF disturbances (30 MHz to 6 GHz). 93
F.6 Suitability for multiple frequencies. 93
F.6.1 General . 93
F.6.2 Test conditions . 93
F.6.3 Test procedure . 93
F.6.4 Test results . 94
F.7 Dry heat test . 94
F.7.1 Test procedure . 94
F.7.2 Test results . 94
F.7.3 Verification of overload releases . 94
F.8 Damp heat test . 94
F.8.1 Test procedure . 94
F.8.2 Verification of overload releases . 94
F.9 Temperature variation cycles at a specified rate of change . 95
F.9.1 Test conditions . 95
F.9.2 Temperature variation cycles without operational performance . 95
F.9.3 Temperature variation cycles with operational performance . 95
Annex G (normative) Power loss . 101
Annex H (normative) Test sequence for AC circuit-breakers suitable for IT systems . 102
H.1 General . 102
H.2 Individual pole short-circuit . 102
H.3 Verification of dielectric withstand, the leakage current and the standby
current . 103
H.4 Verification of overload releases . 103
H.5 Marking . 103
Annex I Void . 104
Annex J (normative) Electromagnetic compatibility (EMC) – Requirements and test
methods for circuit-breakers . 105
J.1 General . 105
J.2 Immunity . 105
J.2.1 General . 105
J.2.2 Electrostatic discharges . 107
J.2.3 Radiated RF electromagnetic fields . 107
J.2.4 Electrical fast transients/bursts (EFT/B) . 108
J.2.5 Surges . 108
J.2.6 Conducted disturbances induced by RF fields (common mode) . 108
J.3 Emission . 108
J.3.1 General . 108
J.3.2 Conducted RF disturbances (150 kHz to 30 MHz) . 109
J.3.3 Radiated RF disturbances (30 MHz to 6 000 MHz) . 109
Annex K (informative) Glossary of symbols and graphical representation of
characteristics . 110
IEC 60947-10:2026 © IEC 2026
Annex L (normative) Circuit-breakers not fulfilling the requirements for overcurrent
protection . 113
Annex M (normative) Modular residual current devices (without integral current
breaking device) . 114
Annex N (normative) Additional requirements for circuit-breakers preventing current
flow in one direction . 115
N.1 Scope and object . 115
N.2 Marking . 115
N.3 Performance requirements . 115
N.4 Tests . 115
Annex O (normative) Additional requirements for circuit breakers including a non-
switching or non-isolating pole . 116
O.1 Scope and object . 116
O.2 Circuit breakers with a non-switching pole . 116
O.2.1 Marking . 116
O.2.2 Performance requirements . 116
O.3 Circuit breakers with a non-isolating pole . 116
O.3.1 General aspects . 116
O.3.2 Marking . 116
O.3.3 Tests . 116
Annex P (normative) Reliability of the breaking capability function . 117
P.1 General . 117
P.2 Evaluation of firmware . 117
P.3 Critical component evaluation . 117
P.4 Breaking capability function . 118
P.5 Circuits to be addressed . 119
P.6 Self-test system . 119
P.7 Switching capability test in case of internal failure . 120
Bibliography . 121

Figure 1 – Test arrangement (connecting cables not shown) for short-circuit tests . 74
Figure 2 – Example of diagram for the temperature stabilization (see 9.3.3.7) of two-
pole DC circuit-breakers classified under 4.9 b) . 75
Figure 3 – Example of diagram for the temperature stabilization (see 9.3.3.7) of
three-pole AC circuit-breakers classified under 4.9 b) . 76
Figure 4 – Test circuit for the breaking operation of circuit breakers that cannot be
switched to the closed position without line power for the "O" operation . 77
Figure 5 – Examples for applying test and control circuit supply voltages for the
measurement of standby current for circuit-breakers classified under 4.9 b) . 78
Figure 6 – Example of a circuit-breaker tripping operation . 78
Figure 7 – Example of a reference curve, calibration curve and breaking curve . 78
Figure F.1 – Representation of test current produced by back-to-back thyristors in
accordance with F.4.1 . 96
Figure F.2 – Test circuit for immunity and emission tests for DC circuit-breakers . 97
Figure F.3 – Test circuit for immunity and emission tests for AC circuit-breakers –
Three-phase connection example . 97
Figure F.4 – Test current for the verification of the influence of the current dips and
interruptions in accordance with F.4.7.1 . 98
IEC 60947-10:2026 © IEC 2026
Figure F.5 – Test circuit for the verification of the influence of surges in the main circuit
(line-to-earth) in accordance with F.4.5 for DC circuit-breakers – Two-pole connection
example . 98
Figure F.6 – Test circuit for the verification of the influence of surges in the main circuit
(line-to-earth) in accordance with F.4.5 for AC circuit-breakers – Three-phase
connection example . 99
Figure F.7 – Test circuit for the verification of the influence of surges in the main circuit
(line-to-line) in accordance with F.4.5 for DC circuit-breakers – Two-pole connection
example . 99
Figure F.8 – Test circuit for the verification of the influence of surges in the main circuit
(line-to-line) in accordance with F.4.5 for AC circuit-breakers – Four-phase connection
example . 100
Figure F.9 – Temperature variation cycles at a specified rate of change in accordance
with F.9.2 . 100
Figure K.1 – Relationship between symbols and tripping characteristics . 112
Figure P.1 – Critical component investigation flowchart . 118

Table 1 – Ratio n between short-circuit making capacity and short-circuit breaking
capacity and related power factor (for AC circuit-breakers) (see 5.3.6.3) . 19
Table 2 – Product information . 22
Table 3 – Preferred values of the rated control circuit supply voltage, if different from
that of the main circuit . 24
Table 4 – Temperature-rise limits for terminals and accessible parts . 26
Table 5 – Characteristics of the opening operation of inverse time-delay overcurrent
opening releases . 26
Table 6 – Number of operating cycles . 35
Table 7 – Overall schema of test sequences . 39
Table 8 – Number of samples for test . 41
Table 9 – Values of power factors and circuit inductance corresponding to test currents . 45
Table 10 – Test sequences I . 50
Table 11 – Maximum standby current. 55
Table 12 – Test circuit characteristics for overload performance . 59
Table 13 – Test sequence II: Rated short-circuit breaking capacity . 63
Table 14 – Test sequence III: Rated individual pole ultimate short-circuit breaking
capacity at phase-to-neutral AC voltage . 65
Table 15 – Test sequence IV: Maximum admissible short-circuit current rate of rise . 66
Table 16 – Test sequence VI: Rated individual pole ultimate short-circuit breaking
capacity at individual pole rated operational voltage U for DC circuit-breakers . 69
e1
Table 17 – Principle for the application of the alternative test programs . 73
Table 18 – Applicability of tests or test sequences to 1, 2 and 4-pole circuit-breakers
according to the alternative program 1 . 73
Table 19 – Applicability of tests or test sequences to 1, 2 and 3-pole circuit-breakers
according to the alternative program 2 . 73
Table C.1 – Tests of Annex C . 81
Table F.1 – Test details for EMC tests . 84
Table F.2 – Performance criteria for immunity tests . 85
Table F.3 – Test parameters for current dips and interruptions . 91
Table F.4 – AC test criteria for voltage dips and interruptions . 92
IEC 60947-10:2026 © IEC 2026
Table F.5 – DC test criteria for voltage dips and interruptions . 92
Table H.1 – Tests of Annex H . 102
Table H.2 – Product information . 103
Table J.1 – EMC – Immunity tests . 106
Table J.2 – EMC – Emission tests . 109
Table K.1 – Symbols and graphical representation of characteristics . 110

IEC 60947-10:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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Low-voltage switchgear and controlgear -
Part 10: Semic
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