prEN IEC 60127-7:2024

SLOVENSKI STANDARD
01-december-2024
Miniaturne varovalke - 7. del: Miniaturni taljivi vložki za posebne namene
Miniature fuses - Part 7: Miniature fuse-links for special applications
Geräteschutzsicherungen - Teil 7: G-Sicherungseinsätze für besondere Anwendungen
Coupe-circuit miniatures - Partie 7: Eléments de remplacement miniatures pour
applications spéciales
Ta slovenski standard je istoveten z: prEN IEC 60127-7:2024
ICS:
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.

32C/647/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60127-7 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-10-18 2025-01-10
SUPERSEDES DOCUMENTS:
32C/630/CD, 32C/641A/CC
IEC SC 32C : MINIATURE FUSES
SECRETARIAT: SECRETARY:
China Mr Jun Cai
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
SC 32B
ASPECTS CONCERNED:
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:
Miniature fuses - Part 7: Miniature fuse-links for special applications

PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
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 60127-7/Ed3 © IEC 2024 2 32C/647CDV
CONTENTS
1 Scope . 3
2 Normative references . 3
3 Terms and definitions . 4
4 General requirements . 5
5 Standard ratings . 5
6 Marking . 5
7 General notes on tests . 6
8 Dimensions and construction . 11
9 Electrical requirements . 12
10 Standard sheets . 23
Annex A (normative) Guidance on ratings to be specified by the manufacturer or to be
agreed upon with the testing house .28
Bibliography .29

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1 Miniature fuses - Part 7: Miniature fuse-links for special application
3 1 Scope
4 This part of IEC 60127 covers requirements for miniature fuse-links for special applications.

5 This part of IEC 60127 is applicable to fuse-links with a rated voltage not exceeding 1 000 V, a
6 rated current not exceeding 125 A and a rated breaking capacity not exceeding 50 kA.
8 Note：Nominal currents above 20A are intended for protection of low power electric devices at low
voltage and not for energy distribution.

9 It does not apply to fuses completely covered by the subsequent parts of IEC 60269-1.

10 It does not apply to miniature fuse-links for appliances intended to be used under special
11 conditions, such as in corrosive or explosive atmospheres.

12 This part of IEC 60127 applies in addition to the requirements of IEC 60127-1.

13 Miniature fuse-links for special applications are not intended to be replaced by the end-user of
14 an electrical / electronic appliance.

15 The object of this part of IEC 60127 is to establish uniform test methods for miniature fuse-links
16 for special applications, so as to allow verification of the values (for example melting time and
17 breaking capacity values) specified by the manufacturer.

19 2 Normative references
20 The following documents, in whole or in part, are normatively referenced in this document and
21 are indispensable for its application. For dated references, only the edition cited applies. For
22 undated references, the latest edition of the referenced document (including any amendments)
23 applies.
24 IEC 60068-2-21:2021, Environmental testing – Part 2-21: Tests – Test U: Robustness of
25 terminations and integral mounting devices

26 IEC 60127-1:2023, Miniature fuses – Part 1: Definitions for miniature fuses and general
27 requirements for miniature fuse-links
28 IEC 60127-4:20XX, Miniature fuses – Part 4: Universal modular fuse-links (UMF) – Through-
29 hole and surface mount types
31 IEC 60127-6:2023, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links

32 IEC 60664-1:2020, Insulation coordination for equipment within low-voltage systems – Part 1:
33 Principles, requirements and tests

34 IEC 60695-2-12:2021, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –
35 Glow-wire flammability index (GWFI) test method for materials
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37 IEC 60695-2-13:2021, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –
38 Glow-wire ignition temperature (GWIT) test method for materials
40 IEC 60695-4:2021, Fire hazard testing – Part 4: Terminology concerning fire tests for
41 electrotechnical products
42 IEC 61249-2-7:2002, Materials for printed boards and other interconnecting structures – Part
43 2-7: Reinforced base materials clad and unclad – Epoxide woven E-glass laminated sheet of
44 defined flammability (vertical burning test), copper-clad

46 IPC 7351B: 2010 Generic requirements for surface mount design and land pattern standard
48 ISO 3:1973, Preferred numbers – Series of preferred numbers

49 3 Terms and definitions
50 For the purposes of this document, the terms and definitions given in Clause 3 of IEC 60127-
51 1:2023, except 3.5, as well as the following apply.

52 3.1
53 miniature fuse-link for special applications
54 enclosed fuse-link which is not covered in IEC 60127-2, IEC 60127-3 or IEC 60127-4 and of
55 rated breaking capacity not exceeding 50 kA, with a width and height not exceeding 12 mm and
56 a length not exceeding 50 mm

57 Note 1 to entry: Special precautions may be necessary to ensure that the fuse-links will be replaced by a fuse-link
58 with the same technical parameters.

59 Note 2 to entry: For fuse-links having a metallic cap at each end, any member of terminals or terminations other
60 than the metallic cap such as wire terminations, pins and bolt-in contacts may not be included in the total length of
61 50 mm and the width and height of 12 mm.

62 3.2
63 t to t
1 8
64 limit values for time/current characteristic

65 3.3
66 I
67 test current for testing at elevated temperature of 70 °C

68 Note 1 to entry: Preferred values are 0,8 I or 1,0 I or 1,1 I .
N N N
69 3.4
70 I (A)
test
71 test current for endurance testing according to method A

72 Note 1 to entry: Preferred values are 1,0 I or 1,05 I or 1,2 I .
N N N
73 3.5
74 I (B)
test
75 test current for endurance testing according to method B

76 Note 1 to entry: Preferred values are 0,8 I or 1,0 I .
N N
77 3.6
78 I (A)
OVL
79 test current for measuring the maximum sustained dissipation according to method A

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80 Note 1 to entry: Preferred values are 1,0 I or 1,25 I or 1,35 I or 1,5 I . 1,0 I is allowable only for n omi n al currents above
N N N N N
81 20 A.
82 3.7
83 I (B)
OVL
84 test current for measuring the maximum sustained dissipation according to method B

85 Note 1 to entry: Preferred values are 1,0 I or 1,25 I .
N N
86 4 General requirements
87 Clause 4 of IEC 60127-1:2006 applies.

88 5 Standard ratings
89 Clause 5 of IEC 60127-1:2006 does not apply.

90 Replacement:
91 The following ratings shall be agreed upon between the testing house and the manufacturer:
92 – rated voltage;
93 – rated current (see standard sheet 1 for preferred ratings);
94 – rated breaking capacity (a.c. and/or d.c.);
95 – time/current characteristic (at least at 2,0 I or 2,1 I and 10 I ).
N N N
96 The following may be agreed upon on an optional basis:
97 – test at elevated temperature;
98 – time/current characteristic (additionally at 2,75 I and 4 I ).
N N
99 Any additional specified values are given in standard sheet 1.

100 6 Marking
101 Clause 6 of IEC 60127-1:2006 applies except as follows.

102 6.1
103 Replacement:
104 d) Not applicable.
105 NOTE A symbol denoting the time/current characteristic cannot be stated, because this part of IEC 60127 does not
106 specify any values for this parameter.

107 Addition:
108 e) Type designation.
109 f) Rated breaking capacity in amperes (A) or in kilo amperes (kA).
110 6.2
111 Deletion of NOTE 2.
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112 6.3
113 Addition after first paragraph:

114 Furthermore the rated breaking capacity in amperes (A) or in kilo amperes (kA) shall be marked
115 on the package label.
116 6.4
117 Addition of heading title and replacement of text:

118 6.4 Colour coding for miniature fuse-links for special applications
119 Marking of fuse-links by means of colour bands according to IEC 60127-1:2006, Annex A, is
120 not permitted. It is, however, possible to use colour markings that clearly differ from this colour
121 band system. In this case, the manufacturer shall provide the relevant information, for example
122 colour key.
123 Additional subclause:
124 6.101 Where marking is impracticable due to space limitations, the relevant information should
125 appear on the smallest package and in the manufacturer’s technical literature.

126 7 General notes on tests
127 Clause 7 of IEC 60127-1:2006 applies except as follows.

128 7.2 Type tests
129 7.2.1
130 Replacement:
131 For testing the individual current ratings of fuses with a.c. or d.c. breaking capacity, the number
132 of fuse-links required is 51, of which 12 are kept as spares. For fuse-links with wire terminations
133 six extra samples (E1 to E6) have to be taken by random and not sorted according to voltage
134 drop. If necessary, these samples can be used as additional spares after performing the tests
135 according to 8.3.
136 The testing schedule is shown in Table 2.

137 For testing the individual current ratings of fuses with a.c. and d.c. breaking capacity, the
138 number of fuse-links required is 63, of which 9 are kept as spares. For fuse-links with wire
139 terminations six extra samples (E1 to E6) have to be taken by random and not sorted according
140 to voltage drop. If necessary, these samples can be used as additional spares after performing
141 the tests according to 8.3.The testing schedule is shown in Table 3.

142 For testing the maximum ampere rating of a homogenous series with a.c. or d.c. breaking
143 capacity the number of fuse-links required is 51, of which 22 are kept as spares. For fuse-links
144 with wire terminations six extra samples (E1 to E6) have to be taken by random and not sorted
145 according to voltage drop. If necessary, these samples can be used as additional spares after
146 performing the tests according to 8.3.

147 The testing schedule is shown in Table 4.

148 For testing the maximum ampere rating of a homogenous series with a.c. and d.c. breaking
149 capacity the number of fuse-links required is 66, of which 32 are kept as spares. For fuse-links

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150 with wire terminations six extra samples (E1 to E6) have to be taken by random and not sorted
151 according to voltage drop. If necessary, these samples can be used as additional spares after
152 performing the tests according to 8.3.

153 The testing schedule is shown in Table 5.

154 For testing the minimum ampere rating of a homogenous series with a.c. and / or d.c. breaking
155 capacity the number of fuse-links required is 38, of which 16 are kept as spares.

156 The testing schedule is shown in Table 6.

157 For testing all of the intermediate ampere rating of a homogenous series with a.c. and / or d.c.
158 breaking capacity the number of fuse-links required is 38,
...