IEC 60127-3:2015/AMD1:2020

IEC 60127-3 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Miniature fuses –
Part 3: Sub-miniature fuse-links

Coupe-circuit miniatures –
Partie 3: Éléments de remplacement subminiatures

IEC 60127-3:2015-01/AMD1:2020-07(en-fr)

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IEC 60127-3 ®
Edition 3.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Miniature fuses –
Part 3: Sub-miniature fuse-links

Coupe-circuit miniatures –
Partie 3: Éléments de remplacement subminiatures

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-9509-0

– 2 – IEC 60127-3:2015/AMD1:2020
© IEC 2020
FOREWORD
This amendment has been prepared by subcommittee 32C: Miniature fuses, of IEC technical
committee 32: Fuses.
The text of this amendment is based on the following documents:
FDIS Report on voting
32C/586/FDIS 32C/589/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
Add, at the end of Clause 10, the following new text:
Addition of the following new Annex A:

© IEC 2020
Annex A
(normative)
Sub-miniature fuse-links according to standard sheet 3 and 4
with optional DC ratings
A.1 General
This annex supplements the requirements of this standard and is to be applied to already tested
and approved sub-miniature fuse-links.
This annex relates to requirements applicable to sub-miniature fuse-links adapted to printed
circuits and used for the protection of electric appliances, electronic equipment and component
parts thereof, normally intended to be used indoors.
The object of this annex is to define additional test methods for sub-miniature fuse-links
according to standard sheet 3 and 4 with optional DC ratings.
A.2 General notes on tests
In addition to the requirements of Clause 7 of IEC 60127-1:2006, the following criteria shall be
observed.
A.2.1 Type tests
Replacement of 7.2.1:
15 additional samples chosen at random are required.
The schedule for testing sub-miniature fuse-links with DC ratings shall be according to
Table A.1.
The requirements of 7.2.3 of IEC 60127-1:2006 are not applicable.
No failure is allowed in any of the additional tests specified in this annex.
Table A.1 – Testing schedule
Fuse-link number
Sub-
DC1 DC4 DC7 DC10 DC13
Description
clause
DC2 DC5 DC8 DC11 DC14
DC3 DC6 DC9 DC12 DC15
A.4.1 Rated breaking capacity X
A.4.1   5 times the rated current   5 I X
N
A.4.1  10 times the rated current   10 I  X
N
A.4.1  50 times the rated current   50 I   X
N
A.4.1 250 times the rated current  250 I   X
N
A.4.1 Insulation resistance X X X X X
NOTE Applicable only when the defined rated breaking capacity is not exceeded.

– 4 – IEC 60127-3:2015/AMD1:2020
© IEC 2020
A.2.2 Test bases for tests
Sub-miniature fuse-links shall be tested in a test board as shown in Figure 1. The test board
shall then be mounted on the test base of Figure 2.
A.3 Marking
Clause 6 of IEC 60127-1:2006 applies except as follows.
6.3
Addition after first paragraph:
Furthermore the DC rated breaking capacity in amperes (A) or in kilo amperes (kA) as well as
the DC rated voltage (VDC) shall be marked on the package label.
A.4 Electrical requirements
A.4.1 Breaking capacity
Replacement of 9.3.1:
Fuse-links shall operate satisfactorily without endangering the surroundings when breaking
prospective currents between the conventional non-fusing current and rated breaking capacity.
The recovery voltage shall be between 1,02 and 1,05 times the rated voltage of the fuse-links
(the upper tolerance may be exceeded with the manufacturer's consent) and shall be maintained
for 30 s after the fuse has operated.
Typical test circuits for DC are given in Figure A.1. The cross-sectional area of copper wire
shall be approximately 6 mm .
For tests at lower prospective currents (5 I , 10 I , 50 I , 250 I ), the inductance of the circuit
N N N N
shall remain constant and the current shall be adjusted by changing the resistance only.
In the case of fuse-links in which any component is organic (such as with a moulded body), the
recovery voltage shall be maintained for 5 min after the fuse has operated.
In principle, the DC rated voltage, rated breaking capacity and associated time constant,
respectively, shall be specified by the manufacturer.
Unless otherwise stated by the manufacturer, the time constant of the test circuit shall be
chosen from Table
...