FprEN IEC 60947-2:2024
(Main)Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
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
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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.
oSIST prEN IEC 60947-2:2022
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.
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.
oSIST prEN IEC 60947-2:2022
IEC CDV 60947-2 © IEC 2022 2 121A/482/CDV
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
oSIST prEN IEC 60947-2:2022
IEC CDV 60947-2 © IEC 2022 3 121A/482/CDV
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
oSIST prEN IEC 60947-2:2022
IEC CDV 60947-2 © IEC 2022 4 121A/482/CDV
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 .
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