kSIST FprEN IEC 60947-10:2026

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.

Niederspannungsschaltgeräte – Teil 10: Halbleiter-Leistungsschalter

Appareillage à basse tension - Partie 10: Disjoncteurs à semi-conducteurs

IEC 60947-10:2026 s'applique aux disjoncteurs à semiconducteurs dont la tension assignée ne dépasse pas 1 000 V en courant alternatif ou 1 500 V en courant continu, et qui sont destinés à être installés et utilisés par des personnes qualifiées ou compétentes.
Le présent document couvre les différents types suivants:
- les disjoncteurs à semiconducteurs (SCCB, Semiconductor Circuit-Breakers), qui comportent des éléments de commutation à semiconducteurs et, pour la fonction de sectionnement, des contacts de sectionnement mécaniques raccordés en série;
- les disjoncteurs hybrides à semiconducteurs (SCHCB, Semiconductor Hybrid Circuit Breakers), qui comportent des éléments de commutation à semiconducteurs et des éléments de commutation mécaniques en parallèle, auxquels s'ajoutent, pour la fonction de sectionnement, des contacts de sectionnement mécaniques raccordés en série.
Dans le présent document, lorsque le terme "disjoncteur" est utilisé seul, il s'applique à ces deux types.
Le présent document s'applique indépendamment des courants assignés, les méthodes de construction et l'emploi prévu des disjoncteurs.
Le présent document a pour objet de spécifier:
a) les caractéristiques des disjoncteurs;
b) les conditions auxquelles doivent satisfaire les disjoncteurs concernant:
1) leur fonctionnement et leur tenue en service normal;
2) leur fonctionnement et leur tenue dans des conditions de circuit anormales spécifiques (par exemple, surcharge ou court circuit);
3) leurs propriétés diélectriques;
4) leurs exigences de compatibilité électromagnétique;
c) les essais destinés à vérifier si ces conditions sont remplies et les méthodes à adopter pour ces essais;
d) les informations à marquer sur les disjoncteurs ou à fournir avec ceux-ci.

Nizkonapetostne stikalne in krmilne naprave - 10. del: Polprevodniški odklopniki

General Information

• Status: Not Published
• Public Enquiry End Date: 27-Mar-2025
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 24-Dec-2025
• Due Date: 11-Feb-2026
• Completion Date: 06-Jan-2026
• Ref Project: FprEN IEC 60947-10:2025 - Low-voltage switchgear and controlgear - Part 10: Semiconductor circuit-breakers

Overview

kSIST FprEN IEC 60947-10:2026 is a draft international standard developed by the International Electrotechnical Commission (IEC) under the scope of CLC. This part of the IEC 60947 series focuses on low-voltage switchgear and controlgear with an emphasis on semiconductor circuit-breakers. The standard addresses classification, characteristics, product information, functional requirements, and testing procedures needed to ensure reliable performance and safety in electrical distribution systems.

Semiconductor circuit-breakers, as outlined in this standard, play a crucial role in modern electrical infrastructures by providing fast and reliable protection against overloads and short circuits. The integration of semiconductor technology enables improved performance compared with traditional electromechanical devices, especially in terms of speed, selectivity, and minimal maintenance.

Key Topics

kSIST FprEN IEC 60947-10:2026 covers several essential areas relevant to the design, application, and evaluation of semiconductor circuit-breakers:

• Classification:
  • Type and operation method of isolation contacts
  • Operating mechanisms for fault and normal conditions
  • Control method, installation, and communication options
  • Degree of protection, current direction, and standby states
• Technical Characteristics:
  • Rated voltages and currents for main and auxiliary circuits
  • Frequency ratings and short-circuit capabilities
  • Surge withstand capability and environmental suitability
• Product Information:
  • Marking and documentation requirements
  • Instructions for installation, operation, maintenance, and end-of-life handling
• Constructional and Performance Requirements:
  • Requirements for isolation, safety, reliability, and integration with digital control systems
  • Electromagnetic compatibility (EMC) and performance in adverse environmental conditions
• Testing and Verification:
  • Comprehensive type, routine, and special tests for ensuring durability and compliance
  • EMC immunity and emission test protocols
  • Tests for mechanical performance, temperature rise, dielectric properties, and switching capabilities

Applications

The adoption of semiconductor circuit-breakers compliant with IEC 60947-10 is increasingly important across various sectors:

• Industrial Automation: Providing fast, programmable protection in automated machinery and robotics, enhancing operational safety and uptime.
• Power Distribution: Enabling selective protection and coordination in low-voltage switchboards, especially where high-speed interruption is essential.
• Renewable Energy Systems: Protecting power electronics and distribution in photovoltaic, wind, and battery energy storage applications where rapid switching is critical.
• Commercial Buildings: Ensuring reliable circuit protection in smart buildings, data centers, and critical infrastructure with high power quality requirements.
• Transport and E-Mobility: Supporting electric vehicle charging infrastructure and traction equipment with dependable semiconductor-based protection.

By integrating testing, marking, and EMC requirements, the standard fosters equipment reliability and regulatory compliance, making it a vital reference for OEMs, integrators, and specifiers.

Related Standards

kSIST FprEN IEC 60947-10:2026 aligns with and builds upon key standards in the low-voltage switchgear and controlgear domain:

• IEC 60947-1: General rules for low-voltage switchgear and controlgear
• IEC 60947-2: Requirements for circuit-breakers
• IEC 60947-3: Switches, disconnectors, switch-disconnectors, and fuse-combination units
• IEC 60947-5: Control circuit devices and switching elements
• IEC 61000 series: Electromagnetic compatibility standards

Adhering to this standard promotes interoperability, safety, and performance in equipment using semiconductor circuit-breakers, and supports compliance with international best practices in electrical protection.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN IEC 60947-10:2025
01-marec-2025
Nizkonapetostne stikalne in krmilne naprave - 10. del: Polprevodniški odklopniki
Low-voltage switchgear and controlgear - Part 10: Semiconductor Circuit-Breakers
Appareillage à basse tension - Partie 10: Disjoncteurs à semi-conducteurs
Ta slovenski standard je istoveten z: prEN IEC 60947-10:2025
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
oSIST prEN IEC 60947-10:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 60947-10:2025
oSIST prEN IEC 60947-10:2025
121A/635/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60947-10 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-01-03 2025-03-28
SUPERSEDES DOCUMENTS:
121A/565/CD, 121A/575A/CC
IEC SC 121A : LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
SECRETARIAT: SECRETARY:
France Mr Michaël LAHEURTE
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 9, TC 22, SC 22G, TC 23, SC 23E, TC 44, TC 64, TC 69
ASPECTS CONCERNED:
Electromagnetic Compatibility, Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of CENELEC,
is drawn to the fact that this Committee Draft for Vote (CDV) is
submitted for parallel voting.
The CENELEC members are invited to vote through the CENELEC
online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware
and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses to be
included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC c lauses. (SEE
AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Low-voltage switchgear and controlgear – Part 10: Semiconductor Circuit-Breakers

PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
SC121A Officers support circulation of CDV for project IEC 60947-10 ED1.
Secretary Note: NC experts are kindly requested to refer their comments to line number.

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

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CONTENTS
FOREWORD . 9
1 Scope . 11
2 Normative references . 11
3 Terms, definitions, symbols and reference clauses . 13
4 Classification . 16
4.1 According to type . 16
4.2 According to the operating mechanism method of the isolation contacts . 16
4.3 According to operation on fault conditions . 16
4.4 According to the method of controlling the operation . 16
4.5 According to the provision for maintenance: . 16
4.6 According to the provision for software upgrade of embedded software . 16
4.7 According to the method of installation. 16
4.8 According to communication method . 16
4.9 According to the behaviour in case of loss of control circuit supply when the
circuit-breaker is in closed position: . 16
4.10 According to the source of control circuit supply . 17
4.10.1 dependent on the main-circuit current (functionally independent of line
voltage or of an external supply) . 17
4.10.2 dependent on line voltage . 17
4.10.3 dependent on an external supply . 17
4.11 According to the degree of protection provided by the enclosure . 17
4.12 According to the direction of current flow and protection . 17
4.12.1 Circuit-breakers protecting in both directions of the current . 17
4.12.2 Circuit-breakers protecting only in one direction of the current, and
preventing current flow in the opposite direction . 17
4.12.3 Circuit-breakers protecting only in one direction of the current, and not
preventing current flow in the opposite direction . 17
4.13 According to the existence of a standby state . 17
4.14 According to the integral cooling method of the breaker . 17
4.15 According to the surge withstand capability . 17
4.16 According to the single-pole voltage rating U for DC applications . 17
e1
4.16.1 Circuit-breakers with each protected pole rated at Ue1 = Ue . 17
4.16.2 Circuit-breakers with each protected pole rated at U < U . 17
e1 e
5 Characteristics of circuit-breaker . 17
5.1 Summary of characteristics . 17
5.2 Type of circuit-breaker . 18
5.3 Rated and limiting values of the main circuit . 18
5.3.1 General . 18
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 . 20
5.3.7 Surge withstand capability . 21
5.4 Control circuits . 21
5.5 Auxiliary Circuits . 22

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5.6 Releases . 22
5.6.1 Release functions . 22
5.6.2 Characteristics . 22
5.6.3 Current setting of over-current releases . 22
5.6.4 Tripping time setting of over-current releases . 23
6 Product information . 23
6.1 Nature of the information . 23
6.2 Marking . 24
6.3 Instructions for installation, operation and maintenance instructions,
decommissioning and dismantling . 24
7 Normal service, mounting and transport conditions . 24
8 Constructional and performance requirements . 24
8.1 Constructional requirements . 24
8.1.1 General . 24
8.1.2 Withdrawable circuit-breakers . 25
8.1.3 Requirements for isolation function . 25
8.1.4 Clearances and creepage distances . 25
8.1.5 Requirements for the safety of the operator . 25
8.1.6 List of construction breaks . 25
8.1.7 Additional requirements for circuit-breakers provided with a neutral pole . 26
8.1.8 Digital inputs and outputs for use with programmable logic controllers
(PLCs) . 26
8.1.9 Indication of the standby state position . 26
8.1.10 Indication of tripping . 26
8.1.11 Fault and abnormal conditions of electronic components . 26
8.1.12 Reliability of the Protective Function . 26
8.2 Performance requirements . 27
8.2.1 Operating conditions . 27
8.2.2 Temperature-rise . 28
8.2.3 Dielectric properties . 29
8.2.4 Ability to make and break under no load, normal load and overload
conditions . 29
8.2.5 Ability to make and break under short-circuit conditions . 30
8.2.6 Requirements for isolation function . 30
8.2.7 Requirements for behaviour in case of loss of control circuit supply . 30
8.3 Electromagnetic compatibility (EMC) . 30
9 Tests . 30
9.1 Kind of tests . 30
9.1.1 General . 30
9.1.2 Type tests. 30
9.1.3 Routine tests . 30
9.1.4 Special tests . 31
9.2 Compliance with constructional requirements . 31
9.2.1 General . 31
9.2.2 Breakdown of components . 31
9.2.3 Components tests . 31
9.3 Type tests . 32
9.3.1 General . 32
9.3.2 Test sequences . 32
9.3.3 General test conditions . 33

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9.3.4 Test sequence I: General performance characteristics . 40
9.3.5 Test sequence II: Rated short-circuit breaking capacity . 51
9.3.6 Test sequence III: Rated individual pole ultimate short-circuit breaking
capacity at phase-to-neutral AC voltage . 52
9.3.7 Test sequence IV: Maximum admissible short-circuit current rate of rise. 53
9.3.8 Test sequence V: Additional verifications for circuit-breakers dependent
on line voltage (4.10.2) or on an external voltage (4.10.3) . 54
9.3.9 Test sequence VI: Rated individual pole ultimate short-circuit breaking
capacity at individual pole rated operational voltage Ue1 for DC circuit-
breakers . 55
9.4 Routine tests . 56
9.4.1 General . 56
9.4.2 Mechanical operation tests . 56
9.4.3 Verification of the calibration of overcurrent releases . 57
9.4.4 Verification of the operation of undervoltage and shunt releases . 57
9.4.5 Dielectric tests . 58
9.4.6 Test for the verification of clearances less than those corresponding to
case A of Table 13 of IEC 60947-1:2020 . 59
9.5 Special tests – Damp heat, salt mist, vibration and shock . 59
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 and leakage 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 . 87
F.3.1 General . 87
F.3.2 Electromagnetic compatibility 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
F.4.7 Current dips . 91
F.4.8 Voltage dips and interruptions . 92

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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 1 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 . 95
F.9 Temperature variation cycles at a specified rate of change . 95
F.9.1 Test conditions . 95
F.9.2 Test procedure . 95
F.9.3 Acceptance criteria . 95
F.9.4 Verification of overload releases . 95
Annex G (normative) Power Loss . 102
Annex H (normative) Test sequence for AC circuit-breakers suitable for IT systems . 103
H.1 General . 103
H.2 Individual pole short-circuit . 103
H.3 Verification of dielectric withstand and leakage current . 104
H.4 Verification of overload releases . 104
H.5 Marking . 104
Annex I Void . 105
Annex J (normative) Electromagnetic compatibility (EMC) – Requirements and test
methods for circuit-breakers . 106
J.1 General . 106
J.2 Immunity . 106
J.2.1 General . 106
J.2.2 Electrostatic discharges . 109
J.2.3 Radiated RF electromagnetic fields . 109
J.2.4 Electrical fast transients/bursts (EFT/B) . 110
J.2.5 Surges . 110
J.2.6 Conducted disturbances induced by RF fields (common mode) . 110
J.3 Emission . 110
J.3.1 General . 110
J.3.2 Conducted RF disturbances (150 kHz to 30 MHz) . 111
J.3.3 Radiated RF disturbances (30 MHz to 6 000 MHz) . 111
Annex K (informative) Glossary of symbols and graphical representation of
characteristics . 112
Annex L (normative) Circuit-breakers not fulfilling the requirements for overcurrent
protection . 115

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Annex M (normative) Modular residual current devices (without integral current
breaking device) . 116
Annex N (normative) Additional requirements for circuit-breakers preventing current
flow in one direction . 117
N.1 Scope and object . 117
N.2 Marking . 117
N.3 Performance requirements . 117
N.4 Tests . 117
Annex O (normative) Additional requirements for circuit breakers including a non-
switching or non-isolating pole . 118
O.1 Scope and object . 118
O.2 Circuit breakers with a non-switching pole . 118
O.2.1 General aspects . 118
O.2.2 Marking . 118
O.2.3 Performance requirements . 118
O.3 Circuit breakers with a non-isolating pole . 118
O.3.1 General aspects . 118
O.3.2 Marking . 118
O.3.3 Tests . 118
Annex P (normative) Reliability of the Protective Function . 119
P.1 General . 119
P.2 Evaluation of firmware . 119
P.3 Critical component evaluation . 119
P.4 Protective Function . 120
P.5 Circuits to be addressed . 121
P.6 Self-test system . 121
P.7 Switching Capability Test in case of internal failure . 121
Bibliography . 123

Figure 1 – Test arrangement (connecting cables not shown) for short-circuit tests . 71
Figure 2 – example of diagram for the temperature stabilization (see 9.3.3.7) of three-
pole AC circuit-breakers (when tested in 9.3.4.6 or in 9.3.7) and for single-pole DC
circuit-breakers . 72
Figure 3 – example of diagram for the temperature stabilization (see 9.3.3.7) of two-
pole DC circuit-breakers . 73
Figure 4 – example of diagram for the temperature stabilization (see 9.3.3.7) of three-
pole AC circuit-breakers (when tested in 9.3.4.6 or in 9.3.7) . 74
Figure 5 – Test circuit for withstand to surges for AC circuit-breakers . 75
Figure 6 – Test circuit for withstand to surges for DC circuit-breakers . 76
Figure 7 – 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 8 – Example of a circuit-breaker tripping operation (for information only) . 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 – Void . 97
Figure F.4 – Test circuit for immunity and emission tests for AC circuit-breakers –
Three-phase connection example . 97

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Figure F.5 – Test current for the verification of the influence of the current dips and
interruptions in accordance with F.4.7.1 . 98
Figure F.6 – Void . 98
Figure F.7 – Void . 98
Figure F.8 – Void . 98
Figure F.9 – Void . 98
Figure F.10 – 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 . 99
Figure F.11 – 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.12 – Void . 100
Figure F.13 – 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 . 100
Figure F.14 – 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.15 – Temperature variation cycles at a specified rate of change in
accordance with F.9.1 . 101
Figure K.1 – Relationship between symbols and tripping characteristics . 114
Figure P.1 – Critical Component Investigation Flowchart . 120

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) . 60
Table 2 – (vacant) . 60
Table 3 – Preferred values of the rated control supply voltage, if different from that of
the main circuit . 60
Table 4 – Product information . 60
Table 5 – Characteristics of the opening operation of inverse time-delay over-current
opening releases . 62
Table 6 – Temperature-rise limits for terminals and accessible parts . 62
Table 7 – Number of operating cycles . 63
Table 8 – Type tests . 63
Table 9 – Alphabetical index of tests . 64
a
Table 10 – Overall schema of test sequences . 65
Table 11 – Void . 66
Table 12 – Principle for the application of the alternative test programs . 66
Table 13 – Applicability of tests or test sequences to 1, 2 and 4-pole circuit-breakers
according to the alternative program 1 . 66
Table 14 – Applicability of tests or test sequences to 1, 2 and 3-pole circuit-breakers
according to the alternative program 2 . 66
Table 15 – Number of samples for test (1 of 2) . 66
Table 15 (2 of 2) . 67
Table 16 – Values of power factors and circuit inductance corresponding to test
currents . 68
Table 17 – Test sequences I . 68

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Table 18 – Test circuit characteristics for overload performance . 68
Table 19 – Test sequence II: Rated short-circuit breaking capacity . 69
Table 20 – Void . 69
Table 21 – Test sequence III: Rated individual pole ultimate short-circuit breaking
capacity at phase-to-neutral AC voltage . 69
Table 22 – Test sequence IV: Maximum admissible short-circuit current rate of rise . 69
Table 23 – Maximum standby current. 69
Table 24 – Test sequence VI: Rated individual pole ultimate short-circuit breaking
capacity at individual pole rated operational voltage U e1 for DC circuit-breakers . 70
Table C.1 – Tests of Annex C . 81
Table F.1 – Test details for EMC tests . 85
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
Table F.5 – DC test criteria for voltage dips and interruptions . 92
Table H.1 – Tests of Annex H . 103
Table H.2 – Product information . 104
Table J.1 – EMC – Immunity tests . 108
Table J.2 – Void . 109
Table J.3 – EMC – Emission tests . 111
Table J.4 – Void . 111
Table K.1 – symbols and graphical representation of characteristics . 112

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 10: Semiconductor circuit-breakers

FOREWORD
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out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60947-10 has been prepared by subcommittee 121A: Low-voltage switchgear and
controlgear, of IEC technical committee 121: Switchgear and controlgear and their assemblies
for low-voltage.
The text of this International Standard is based on the following documents:
FDIS Report on voting
121A/XX/FDIS 121A/XX/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.

oSIST prEN IEC 60947-10:2025
121A/635/CDV 10 IEC CDV 60947-10 © IEC 2024
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
The National Committees are requested to note that for this document the stability date
is 20XX.
THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE DELETED
AT THE PUBLICATION STAGE.
oSIST prEN IEC 60947-10:2025
IEC CDV 60947-10 © IEC 2024 – 11 – 121A/635/CDV
1 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
3 Part 10: Semiconductor circuit-breakers
5 1 Scope
6 This part of IEC 60947 series applies to semiconductor circuit-breakers, intended to be installed
7 and operated by instructed or skilled persons, the main terminals of which are intended to be
8 connected to circuits, the rated voltage of which does not exceed 1 000 V AC. or 1 500 V DC.
9 This document covers the following different types:
10 – Semiconductor Circuit-Breakers (SCCBs) have semiconductor switching elements and, for
11 isolation function, mechanical switching elements connected in series.
12 – Semiconductor Hybrid Circuit-Breakers (SCHCBs) have semiconductor switching elements
13 and mechanical switching elements in paralle
...