oSIST prEN IEC 60947-2:2022

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

Niederspannungsschaltgeräte - Teil 2: Leistungsschalter

Appareillage à basse tension - Partie 2: Disjoncteurs

Nizkonapetostne stikalne in krmilne naprave - 2. del: Odklopniki

General Information

• Status: Not Published
• Public Enquiry End Date: 14-Sep-2022
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 17-Jun-2022
• Due Date: 04-Nov-2022
• Completion Date: 25-Nov-2022
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request as regards harmonised standards in support of Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
• Ref Project: prEN IEC 60947-2:2022 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers

Relations

• Revised: SIST EN 60947-2:2017/A1:2020 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2016/A1:2019)
• Effective Date: 14-Jan-2020
• Revised: SIST EN 60947-2:2017 - Low-voltage switchgear and controlgear - Part 2: Circuit-breakers (IEC 60947-2:2016)
• Effective Date: 14-Jan-2020

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN IEC 60947-2:2022
01-september-2022
Nizkonapetostne stikalne in krmilne naprave - 2. del: Odklopniki
Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
Niederspannungsschaltgeräte - Teil 2: Leistungsschalter
Appareillage à basse tension - Partie 2: Disjoncteurs
Ta slovenski standard je istoveten z: prEN IEC 60947-2:2022
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
oSIST prEN IEC 60947-2:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 60947-2:2022

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oSIST prEN IEC 60947-2:2022
121A/482/CDV

COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60947-2 ED6
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2022-06-03 2022-08-26
SUPERSEDES DOCUMENTS:
121A/437/CD, 121A/449B/CC

IEC SC 121A : LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
SECRETARIAT: SECRETARY:
France Mr Michaël LAHEURTE
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

SC 23E
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE 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.

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

PROPOSED STABILITY DATE: 2026

NOTE FROM TC/SC OFFICERS:
SC121A Officers support circulation of CDV for project IEC 60947-2 ED6.
Secretary Note: NC experts are kindly requested to refer their comments to line numbers.

Copyright © 2022 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
download this 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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1 CONTENTS
2 FOREWORD . 16
3 1 Scope . 18
4 2 Normative references . 19
5 3 Terms and definitions . 20
6 4 Classification . 24
7 4.1 According to their selectivity category, A or B (see 5.4) . 24
8 4.2 According to the method of controlling the operating mechanism: . 24
9 4.3 According to the provision for maintenance: . 24
10 4.4 According to the method of installation:. 24
11 4.5 According to the degree of protection provided by the enclosure (see 8.1.12
12 of IEC 60947-1:2020) . 24
13 5 Characteristics of circuit-breakers. 24
14 5.1 Summary of characteristics . 24
15 5.2 Type of circuit-breaker . 24
16 5.3 Rated and limiting values of the main circuit . 24
17 5.3.1 General. 24
18 5.3.2 Rated voltages . 25
19 5.3.3 Currents. 25
20 5.3.4 Rated frequency . 25
21 5.3.5 Rated duty . 25
22 5.3.6 Short-circuit characteristics . 26
23 5.4 Selectivity categories . 29
24 5.5 Control circuits . 29
25 5.5.1 Electrical control circuits . 29
26 5.5.2 Air-supply control circuits (pneumatic or electro-pneumatic) . 29
27 5.6 Auxiliary circuits . 29
28 5.7 Releases. 29
29 5.7.1 Types . 29
30 5.7.2 Characteristics . 30
31 5.7.3 Current setting of overcurrent releases . 30
32 5.7.4 Tripping time setting of overcurrent releases. 31
33 5.8 Integral fuses (integrally fused circuit-breakers) . 31
34 6 Product information . 31
35 6.1 Nature of the information . 31
36 6.2 Marking . 31
37 6.3 Instructions for installation, operation and maintenance . 33
38 7 Normal service, mounting and transport conditions . 33
39 8 Constructional and performance requirements . 34
40 8.1 Constructional requirements . 34
41 8.1.1 General. 34
42 8.1.2 Withdrawable circuit-breakers . 34
43 8.1.3 Isolation . 34
44 8.1.4 Clearances and creepage distances . 34
45 8.1.5 Requirements for the safety of the operator . 35
46 8.1.6 List of construction breaks . 35

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47 8.1.7 Additional requirements for circuit-breakers provided with a neutral
48 pole . 35
49 8.1.8 Digital inputs and outputs for use with programmable logic controllers
50 (PLCs) . 35
51 8.2 Performance requirements . 36
52 8.2.1 Operating conditions . 36
53 8.2.2 Temperature-rise . 38
54 8.2.3 Dielectric properties . 39
55 8.2.4 Ability to make and break under no load, normal load and overload
56 conditions . 40
57 8.2.5 Ability to make and break under short-circuit conditions . 42
58 8.2.6 Vacant . 42
59 8.2.7 Requirements for isolation . 42
60 8.2.8 Specific requirements for integrally fused circuit-breakers . 42
61 8.2.9 Co-ordination between a circuit-breaker and another short-circuit
62 protective device . 43
63 8.3 Electromagnetic compatibility (EMC) . 43
64 9 Tests . 43
65 9.1 Kind of tests . 43
66 9.1.1 General. 43
67 9.1.2 Type tests . 43
68 9.1.3 Routine tests . 43
69 9.1.4 Special tests . 43
70 9.2 Compliance with constructional requirements . 43
71 9.3 Type tests . 44
72 9.3.1 General. 44
73 9.3.2 Test sequences . 45
74 9.3.3 General test conditions . 52
75 9.3.4 Test sequence I: General performance characteristics . 62
76 9.3.5 Test sequence II: Rated service short-circuit breaking capacity . 71
77 9.3.6 Test sequence III: Rated ultimate short-circuit breaking capacity . 74
78 9.3.7 Test sequence IV: Rated short-time withstand current . 75
79 9.3.8 Test sequence V: Performance of integrally fused circuit-breakers. 77
80 9.3.9 Test sequence VI: Combined test sequence. 79
81 9.3.10 Test sequence VII: Critical DC load current . 80
82 9.3.11 Test sequence VIII: Rated individual pole ultimate short-circuit
83 breaking capacity at phase-to-neutral AC voltage . 81
84 9.4 Routine tests. 82
85 9.4.1 General. 83
86 9.4.2 Mechanical operation tests . 83
87 9.4.3 Verification of the calibration of overcurrent releases . 83
88 9.4.4 Verification of the operation of undervoltage and shunt releases . 84
89 9.4.5 Additional tests for CBRs . 84
90 9.4.6 Dielectric tests . 85
91 9.4.7 Test for the verification of clearances less than those corresponding to
92 case A of Table 13 of IEC 60947-1:2020 . 86
93 9.5 Special tests – Damp heat, salt mist, vibration and shock . 86
94 Annex A (normative) Coordination between a circuit-breaker and another short-circuit
95 protective device associated in the same circuit . 89
96 A.1 General . 89

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97 A.2 Object . 89
98 A.3 General requirements for the co-ordination of a circuit-breaker with another
99 SCPD . 89
100 A.4 Type and characteristics of the associated SCPD . 89
101 A.5 Verification of selectivity . 89
102 A.6 Verification of back-up protection . 89
103 Annex B (normative)  Circuit-breakers incorporating residual current protection . 91
104 B.1 General . 91
105 B.1.1 Preamble . 91
106 B.1.2 Object . 91
107 B.2 Terms and definitions . 92
108 B.2.1 Terms and definitions relating to currents flowing from live parts to
109 earth . 92
110 B.2.2 Terms and definitions relating to the energization of a CBR . 92
111 B.2.3 Terms and definitions relating to the operation and the functions of a
112 CBR . 93
113 B.2.4 Terms and definitions relating to values and ranges of energizing
114 quantities . 94
115 B.3 Classification . 95
116 B.3.1 Classification according to the method of operation of the residual
117 current function . 95
118 B.3.2 Classification according to the possibility of adjusting the residual
119 operating current . 95
120 B.3.3 Classification according to time delay of the residual current function . 95
121 B.3.4 Classification according to behaviour in presence of a DC component . 95
122 B.4 Characteristics of CBRs concerning their residual current function . 95
123 B.4.1 Rated values . 95
124 B.4.2 Preferred and limiting values. 96
125 B.4.3 Value of the rated residual short-circuit making and breaking capacity
126 (I ) . 97
m
127 B.4.4 Operating characteristics in the case of an earth fault current in the
128 presence or absence of a DC component . 98
129 B.5 Marking . 98
130 B.6 Normal service, mounting and transport conditions . 100
131 B.7 Design and operating requirements . 100
132 B.7.1 Design requirements . 100
133 B.7.2 Operating requirements . 100
134 B.7.3 Electromagnetic compatibility . 104
135 B.8 Tests . 104
136 B.8.1 Test sequences . 104
137 B.8.2 Verification of the operating characteristics . 107
138 B.8.3 Verification of dielectric properties . 109
139 B.8.4 Verification of the operation of the test device at the limits of rated
140 voltage . 109
141 B.8.5 Verification of the limiting value of the non-operating current under
142 overcurrent conditions . 110
143 B.8.6 Verification of the resistance against unwanted tripping due to surge
144 currents resulting from impulse voltages . 110
145 B.8.7 Additional verifications for CBRs of types A and B . 111
146 B.8.8 Additional verifications for CBRs of type B . 113

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147 B.8.9 Verification of the behaviour of CBRs functionally dependent on line
148 voltage classified under B.3.1.2.1 . 117
149 B.8.10 Verification of the behaviour of CBRs functionally dependent on line
150 voltage classified under B.3.1.2.2 . 118
151 B.8.11 Verification of the residual short-circuit making and breaking capacity . 119
152 B.8.12 Verification of the effects of environmental conditions . 120
153 B.8.13 Verification of electromagnetic compatibility . 120
154 B.8.14 Test for variations or interruptions of voltage and for voltage dips . 122
155 Annex C (normative)  Individual pole short-circuit test sequence . 135
156 C.1 General . 135
157 C.2 Test of individual pole short-circuit breaking capacity . 135
158 C.3 Verification of dielectric withstand and leakage current . 135
159 C.4 Verification of overload releases . 135
160 Annex D (normative) Additional requirements for circuit-breakers intended for
161 connection of aluminium conductors . 136
162 D.1 General . 136
163 D.2 Terms and definitions . 136
164 D.3 Classification . 137
165 D.4 Characteristics . 137
166 D.5 Product information . 137
167 D.5.1 Nature of information . 137
168 D.5.2 Marking. 137
169 D.5.3 Instructions for installation, operation and maintenance . 137
170 D.6 Normal service, mounting and transport conditions . 138
171 D.7 Constructional and performance requirements . 138
172 D.8 Tests . 138
173 D.8.1 General. 138
174 D.8.2 Current cycling test . 139
175 D.8.3 Climatic test . 143
176 D.8.4 Mechanical properties of terminals . 144
177 D.8.5 Test for insertability of unprepared round aluminium conductors
178 having the maximum cross-section . 144
179 Annex E (informative) Items subject to agreement between manufacturer and user . 148
180 Annex F (normative) Additional tests for circuit-breakers with electronic overcurrent
181 protection . 149
182 F.1 General . 149
183 F.2 List of tests . 149
184 F.2.1 General. 149
185 F.2.2 Electromagnetic compatibility (EMC) tests . 149
186 F.2.3 Suitability for multiple frequencies . 150
187 F.2.4 Dry heat test . 150
188 F.2.5 Damp heat test . 150
189 F.2.6 Temperature variation cycles at a specified rate of change . 150
190 F.3 General test conditions . 150
191 F.3.1 General. 150
192 F.3.2 Electromagnetic compatibility tests . 150
193 F.4 Immunity tests . 151
194 F.4.1 Harmonic currents . 151
195 F.4.2 Electrostatic discharges . 152

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196 F.4.3 Radiated RF electromagnetic fields . 153
197 F.4.4 Electrical fast transient/burst (EFT/B) . 153
198 F.4.5 Surges . 153
199 F.4.6 Conducted disturbances induced by RF fields (common mode) . 153
200 F.4.7 Current dips . 154
201 F.5 Emission tests . 154
202 F.5.1 Harmonics . 154
203 F.5.2 Voltage fluctuations . 154
204 F.5.3 Conducted RF disturbances (150 kHz to 30 MHz) . 155
205 F.5.4 Radiated RF disturbances (30 MHz to 1 GHz) . 155
206 F.6 Suitability for multiple frequencies . 155
207 F.6.1 General. 155
208 F.6.2 Test conditions . 155
209 F.6.3 Test procedure . 155
210 F.6.4 Test results . 156
211 F.7 Dry heat test . 156
212 F.7.1 Test procedure . 156
213 F.7.2 Test results . 156
214 F.7.3 Verification of overload releases . 156
215 F.8 Damp heat test . 156
216 F.8.1 Test procedure . 156
217 F.8.2 Verification of overload releases . 157
218 F.9 Temperature variation cycles at a specified rate of change . 157
219 F.9.1 Test conditions . 157
220 F.9.2 Test procedure . 157
221 F.9.3 Test results . 157
222 F.9.4 Verification of overload releases . 157
223 Annex G (normative) Power loss . 171
224 G.1 General . 171
225 G.2 Determination method . 171
226 G.2.1 AC circuit-breakers of rated current exceeding 400 A. 171
227 G.2.2 AC circuit-breakers of rated current not exceeding 400 A . 172
228 G.2.3 DC circuit-breakers . 172
229 G.3 Test conditions . 172
230 G.4 Test method . 172
231 G.4.1 General. 172
232 G.4.2 Voltage drop measurements . 173
233 G.4.3 Current measurement . 173
234 Annex H (normative) Test sequence for circuit-breakers for IT systems .
...