prEN IEC 61643-41:2023

SLOVENSKI STANDARD
01-januar-2024
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 41. del: Naprave
za zaščito pred prenapetostnimi udari za nizkonapetostne DC napajalne sisteme -
Zahteve in preskusne metode
Low-voltage surge protective devices - Part 41: Surge protective devices connected to
DC low-voltage power systems - Requirements and test methods
Ta slovenski standard je istoveten z: prEN IEC 61643-41:2023
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

37A/402/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 61643-41 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-11-03 2024-01-26
SUPERSEDES DOCUMENTS:
37A/367/CD, 37A/392/CC
IEC SC 37A : LOW-VOLTAGE SURGE PROTECTIVE DEVICES
SECRETARIAT: SECRETARY:
United States of America Mr Casey Granata
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

SC 37B,TC 64,TC 81,TC 82,TC 109
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.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Low-voltage surge protective devices - Part 41: Surge protective devices connected to DC low-voltage
power systems – Requirements and test methods

PROPOSED STABILITY DATE: 2026
NOTE FROM TC/SC OFFICERS:
This document must be read in conjuction with 37A/401/CDV for IEC 61643-01.

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.

IEC CDV 61643-41/Ed1 © IEC 2023 – 2 – 37A/402/CDV
1 CONTENTS
2 FOREWORD . 4
3 INTRODUCTION . 6
4 1 Scope . 7
5 2 Normative references . 7
6 3 Terms, definitions and abbreviated terms . 7
7 4 Classification . 8
8 4.13 End of life mode of the SPD-assembly . 8
9 5 Void . 8
10 6 Marking and other product information . 8
11 6.2 List of items . 8
12 6.2.100 Markings which are required on the body, or permanently attached to
13 the body, of the SPD: . 8
14 6.2.101 Information to be provided by the manufacturer: . 8
15 6.2.102 Information which shall be provided by the manufacturer for type
16 testing, as applicable: . 8
17 7 Service conditions . 8
18 8 Requirements . 8
19 8.3 Electrical requirements . 9
20 8.3.9 Behaviour under temporary overvoltages . 9
21 9 Tests . 9
22 9.1 General . 9
23 9.1.1 General testing procedures . 9
24 9.3 Electrical tests . 15
25 9.3.3 Protective conductor current I . 15
PE
26 9.3.5 Operating duty test . 15
27 9.3.6 Disconnectors, SC-means and safety performance of overstressed
28 SPDs . 15
29 9.3.9 Behaviour under temporary overvoltages (TOVs) . 19
30 Annex A (normative) Application of annexes from IEC 61643-01 . 22
31 Annex B (normative)  Test voltages for SPDs - U . 23
test
32 Annex C (normative)  TOV Ratings . 25
33 C.1 TOV test values for DC power systems . 25
34 Annex D (informative) DC power systems . 27
35 D.1 General information about DC power system grounding and connection
36 naming . 27
37 D.1.1 TT system . 27
38 D.1.2 TN system . 28
39 D.1.3 IT system . 31
40 Bibliography . 33
IEC CDV 61643-41/Ed1 © IEC 2023 – 3 – 37A/402/CDV
42 FIGURES
43 Figure 1 - Procedure for sample preparation for dedicated overstress test . 18
44 Figure 2 – Example of a test circuit for the TOV tests . 19
45 Figure 3 – Timing diagram for the TOV tests . 20
46 Figure D.1 – TT DC distribution system . 27
47 Figure D.2 – TT DC distribution system with a mid-point . 28
48 Figure D.3 – TN-S DC distribution system . 28
49 Figure D.4 – TN-S DC distribution system with a mid-point . 29
50 Figure D.5 – TN-C DC distribution system. 29
51 Figure D.6 – TN-C DC distribution system with a mid-point . 30
52 Figure D.7 – TN-C-S DC distribution system . 30
53 Figure D.8 – TN-C-S DC distribution system with a mid-point . 31
54 Figure D.9 – IT DC distribution system . 31
55 Figure D.10 – IT DC distribution system with a mid-point . 32
57 TABLES
58 Table 1 – Type test requirements for SPDs . 11
59 Table 2 – Prospective short circuit current and time constant . 16
60 Table A.1 - Application of annexes from IEC 61643-01 . 22
61 Table B.1 – Test voltage values . 24
62 Table C.1 – TOV test values for DC power systems . 25
63 Table C.2 – Prospective short-circuit currents for TOV tests . 26
IEC CDV 61643-41/Ed1 © IEC 2023 – 4 – 37A/402/CDV
66 INTERNATIONAL ELECTROTECHNICAL COMMISSION
67 ____________
69 LOW-VOLTAGE SURGE PROTECTIVE DEVICES –
71 Part 41: Surge protective devices connected
72 to DC low-voltage power systems –
73 Requirements and test methods
77 FOREWORD
78 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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109 indispensable for the correct application of this publication.
110 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
111 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
112 International Standard IEC 61643-41 has been prepared by subcommittee 37A: Low-voltage
113 surge protective devices, of IEC technical committee 37:Surge arresters.
114 This first edition only contains the specific requirements for SPDs for DC applications.
115 The text of this International Standard is based on the following documents:
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
117 Full information on the voting for the approval of this International Standard can be found in
118 the report on voting indicated in the above table.

IEC CDV 61643-41/Ed1 © IEC 2023 – 5 – 37A/402/CDV
119 This document has bee
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