prEN IEC 61643-31:2025
(Main)Low-voltage surge protective devices - Part 31: Requirements and test methods for SPDs for photovoltaic installations
Low-voltage surge protective devices - Part 31: Requirements and test methods for SPDs for photovoltaic installations
Parafoudres basse tension - Partie 31: Parafoudres pour usage spécifique y compris en courant continu - Exigences et méthodes d'essai des parafoudres pour installations photovoltaïques
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 31. del: Zahteve in preskusne metode za SPD za fotonapetostne inštalacije
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SLOVENSKI STANDARD
01-januar-2026
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 31. del: Zahteve
in preskusne metode za SPD za fotonapetostne inštalacije
Low-voltage surge protective devices - Part 31: Requirements and test methods for
SPDs for photovoltaic installations
Parafoudres basse tension - Partie 31: Parafoudres pour usage spécifique y compris en
courant continu - Exigences et méthodes d'essai des parafoudres pour installations
photovoltaïques
Ta slovenski standard je istoveten z: prEN IEC 61643-31:2025
ICS:
27.160 Sončna energija Solar energy engineering
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
37A/449/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61643-31 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-11-21 2026-02-13
SUPERSEDES DOCUMENTS:
37A/448/RR
IEC SC 37A : LOW-VOLTAGE SURGE PROTECTIVE DEVICES
SECRETARIAT: SECRETARY:
United States of America Mr David Richmond
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 64,TC 81
ASPECTS CONCERNED:
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 31: Requirements and test methods for SPDs for
photovoltaic installations
PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
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 61643-31 © IEC 2025
1 CONTENTS
3 FOREWORD . 3
4 INTRODUCTION . 6
5 1 Scope . 7
6 2 Normative references . 7
7 3 Terms, definitions and abbreviated terms . 8
8 3.1 Terms and definitions . 8
9 3.1.8 8
10 3.1.23 8
11 3.1.51 8
12 3.2 Acronyms and symbols . 8
13 4 Classification . 9
14 4.5 Type of SPD . 9
15 5 Void . 9
16 6 Marking and other product information . 9
17 6.1 General . 9
18 6.2 List of items . 9
19 6.2.100 Markings which are required on the body, or permanently attached to
20 the body, of the SPD: . 10
21 6.2.101 Information to be provided by the manufacturer: . 10
22 6.2.102 Information which shall be provided by the manufacturer for type
23 testing, as applicable: . 10
24 7 Service conditions . 11
25 7.1 Voltage . 11
26 8 Requirements . 11
27 8.1 General requirements . 11
28 8.3 Electrical requirements . 11
29 8.3.6 Safety performance of overstressed SPDs . 11
30 8.3.9 Behaviour under temporary overvoltages . 12
31 8.4 Mechanical requirements . 12
32 8.4.3 External connections . 12
33 8.6 Additional requirements for specific SPD designs . 12
34 8.6.1 One-port SPDs with separate input/output connections . 12
35 8.6.4 Total Discharge Current I . 12
Total
36 8.6.5 Two port SPDs . 12
37 8.6.6 Short-circuiting SPDs . 12
38 9 Tests . 12
39 9.1 Type testing procedures . 13
40 9.1.1 General . 13
41 9.3 Electrical tests . 17
42 9.3.3 Protective conductor current I . 17
PE
43 9.3.5 Operating duty test . 17
44 9.3.6 Safety performance of overstressed SPDs . 18
45 9.3.9 Behaviour under temporary overvoltages (TOVs) . 22
46 This test from IEC 61643-01 does not apply. . 22
IEC CDV 61643-31 © IEC 2025
47 9.6 Additional tests for specific SPD designs . 22
48 Subclause 9.6 of IEC 61643-01 applies with the following modification: . 22
49 9.6.1 Test for one-port SPDs with separate input/output connections . 22
50 Subclause 9.6.1. of IEC 61643-01 applies with the following modifications: . 22
51 Subclause 9.6.1.1 of IEC 61643-01 applies with the following modifications: . 22
52 Subclause 9.6.1.1.1 of IEC 61643-01 is replaced by: . 22
53 Subclause 9.6.1.2 of IEC 61643-01 does not apply. . 22
54 Subclause 9.6.1.3 of IEC 61643-01 does not apply. . 22
55 9.6.5 Test for two port SPDs only . 22
56 Subclause 9.6.5 of IEC 61643-01 does not apply. . 22
57 Annex AA (normative) Application of annexes from IEC 61643-01 . 23
58 Annex BB (normative) Test to determine the magnitude of the follow current of an
59 SPD . 24
60 Annex CC (informative) Transient behaviour of the PV test source . 25
61 CC.1 Transient behaviour of the PV test source according to 9.3.5.2 . 25
62 CC.2 Test setup using a semiconductor switch to determine the transient
63 behaviour of a PV test source . 25
64 CC.3 Alternative test setup using a fuse . 27
65 Annex DD (normative) Reduced test procedures . 29
66 Bibliography . 31
68 Figure 100 – I/U characteristics for the simulated PV-source . 15
69 Figure 101 – Example of sample preparation for SPD dedicated overstress test . 22
70 Figure CC.1 – Test setup using an adjustable semiconductor switch to determine the
71 transient behaviour of a PV test source . 27
72 Figure CC.2 – Time behaviour of voltage and current during disconnection operating
73 time of a semiconductor switch at a PV-source I = 4 A, open-circuit voltage = 640 V . 28
SC
74 Figure CC.3 – Semiconductor disconnection behaviour (normalized) with intersection
75 point i(t) / u(t) . 28
76 Figure CC.4 – I/U-characteristic of the PV test source calculated from the normalized
77 current and voltage records in Figure C.3 . 29
78 Figure CC.5 – Test setup using a fuse to determine the transient behaviour of a PV
79 test source . 29
80 Figure CC.6 – Normalized disconnection behaviour during operation of a fuse rated
81 0,1 x I at a PV test source with intersection point i(t) and u(t) . 30
SCPV
82 Figure CC.7 – I/U-characteristic of the PV test source calculated from the normalized
83 current and voltage records in Figure CC.6 . 30
85 Table 1 – List of Acronyms and symbols . 10
86 Table 100 – Type test requirements for SPDs . 17
87 Table 102 – Specific power source characteristics for dedicated overstress test . 21
88 Table AA.1 – Application of annexes from IEC 61643-01 . 25
89 Table DD.1 – Reduced test procedure for SPDs complying with IEC 61643-31:2018 . 32
IEC CDV 61643-31 © IEC 2025
92 INTERNATIONAL ELECTROTECHNICAL COMMISSION
93 ____________
95 LOW-VOLTAGE SURGE PROTECTIVE DEVICES –
97 Part 31: Surge protective devices connected to photovoltaic (PV)
98 installations – Requirements and test methods
100 FOREWORD
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