SIST EN 60127-1:2007

Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links

This part of IEC 60127 covers the general requirements and tests applicable to all types of miniature fuse-links (e.g. cartridge fuse-links, sub-miniature fuse-links and universal modular fuse-links) for the protection of electric appliances, electronic equipment and component parts thereof normally intended to be used indoors. Specific details covering each major subdivision are given in subsequent parts. This standard does not apply to fuses for appliances intended to be used under special conditions, such as in a corrosive or explosive atmosphere. The object of this standard is a) to establish uniform requirements for miniature fuses so as to protect appliances or parts of appliances in the most suitable way, b) to define the performance of the fuses, so as to give guidance to designers of electrical appliances and electronic equipment and to ensure replacement of fuse-links by those of similar dimensions and characteristics, c) to define methods of testing, d) to define maximum sustained dissipation of fuse-links to ensure good compatibility of stated power acceptance when used with fuse-holders according to this standard (see IEC 60127-6).

Geräteschutzsicherungen -- Teil 1: Begriffe für Geräteschutzsicherungen und allgemeine Anforderungen an G-Sicherungseinsätze

Coupe-circuit miniatures -- Partie 1: Définitions pour coupe-circuit miniatures et prescriptions générales pour éléments de remplacement miniatures

Miniaturne varovalke - 1. del: Definicije za miniaturne varovalke in splošne zahteve za miniaturne taljive vložke (IEC 60127-1:2006)

General Information

• Status: Published
• Publication Date: 31-Dec-2006
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: EVA - Fuses
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2007
• Due Date: 01-Jan-2007
• Completion Date: 01-Jan-2007
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Ref Project: EN 60127-1:2006 - Miniature fuses - Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links

RELATIONS

• Revised: SIST EN 60127-1:1995/A1:2000 - Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links
• Effective Date: 13-May-2010
• Revised: SIST EN 60127-1:1995 - Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links
• Effective Date: 13-May-2010
• Revised: SIST EN 60127-1:1995/A2:2004 - Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links
• Effective Date: 13-May-2010
• Amended By: SIST EN 60127-1:2007/A1:2011 - Miniature fuses - Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links (IEC 60127-1:2006/A1:2011)
• Effective Date: 01-Sep-2011
• Replaces: SIST EN 60127-1:1995/A2:2004 - Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links
• Effective Date: 06-May-2014
• Replaces: SIST EN 60127-1:1995 - Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links
• Effective Date: 06-May-2014
• Replaces: SIST EN 60127-1:1995/A1:2000 - Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links
• Effective Date: 06-May-2014
• Amended By: SIST EN 60127-1:2007/A2:2015 - Miniature fuses - Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links (IEC 60127-1:2006/A2:2015)
• Effective Date: 30-Jul-2014
• Revised: SIST EN 60127-1:2007/A2:2015 - Miniature fuses - Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links (IEC 60127-1:2006/A2:2015)
• Effective Date: 16-Jul-2014
• Official Journal Project Relation: SIST EN 60127-1:1995 - Miniature fuses -- Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links
• Effective Date: 16-Mar-2010

Standards Content (sample)

SLOVENSKI SIST EN 60127-1:2007
STANDARD
januar 2007
Miniaturne varovalke - 1. del: Definicije za miniaturne varovalke in splošne
zahteve za miniaturne taljive vložke (IEC 60127-1:2006)
(istoveten EN 60127-1:2006)

Miniature fuses - Part 1: Definitions for miniature fuses and general requirements

for miniature fuse-links (IEC 60127-1:2006)
ICS 29.120.50 Referenčna številka
SIST EN 60127-1:2007(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 60127-1
NORME EUROPÉENNE
July 2006
EUROPÄISCHE NORM
ICS 29.120.50 Supersedes EN 60127-1:1991 + A1:1999 + A2:2003
English version
Miniature fuses
Part 1: Definitions for miniature fuses and
general requirements for miniature fuse-links
(IEC 60127-1:2006)
Coupe-circuit miniatures Geräteschutzsicherungen
Partie 1: Définitions pour coupe-circuit Teil 1: Begriffe für
miniatures et prescriptions générales pour Geräteschutzsicherungen und
éléments de remplacement miniatures allgemeine Anforderungen an
(CEI 60127-1:2006) G-Sicherungseinsätze
(IEC 60127-1:2006)

This European Standard was approved by CENELEC on 2006-07-01. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in two official versions (English and German). A version in any other language

made by translation under the responsibility of a CENELEC member into its own language and notified to the

Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60127-1:2006 E
---------------------- Page: 2 ----------------------
EN 60127-1:2006 - 2 -
Foreword

The text of document 32C/387/FDIS, future edition 2 of IEC 60127-1, prepared by SC 32C, Miniature

fuses, of IEC TC 32, Fuses, was submitted to the IEC-CENELEC parallel vote and was approved by

CENELEC as EN 60127-1 on 2006-07-01.
This European Standard supersedes EN 60127-1:1991 + A1:1999 + A2:2003.

The major technical changes concern Subclause 9.2.3 where the nature of the current source has been

clarified; in addition, IEC 60038: IEC standard voltages, has been added to the list of normative

references.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2007-04-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-07-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60127-1:2006 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60062 NOTE Harmonized as EN 60062:2005 (not modified).
__________
---------------------- Page: 3 ----------------------
- 3 - EN 60127-1:2006
Annex ZA
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
1) 2) 3)
IEC 60038 (mod) - IEC standard voltages HD 472 S1 1989
+ corr. February 2002
+ A1 1995
IEC 60127-6 1994 Miniature fuses EN 60127-6 1994
+ A1 1996 Part 6: Fuse-holders for miniature fuse-links + A1 1996
+ A2 2002 + A2 2003
Undated reference.

The title of HD 472 S1 is: Nominal voltages for low voltage public electricity supply systems.

Valid edition at date of issue.
---------------------- Page: 4 ----------------------
INTERNATIONAL IEC
STANDARD 60127-1
Second edition
2006-06
Miniature fuses –
Part 1:
Definitions for miniature fuses and
general requirements for miniature fuse-links
 IEC 2006  Copyright - all rights reserved

No part of this publication may be reproduced or utilized in any form or by any means, electronic or

mechanical, including photocopying and microfilm, without permission in writing from the publisher.

International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland

Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch

PRICE CODE
Commission Electrotechnique Internationale U
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
---------------------- Page: 5 ----------------------
– 2 – 60127-1  IEC:2006(E)
CONTENTS

FOREWORD...........................................................................................................................3

1 Scope and object..............................................................................................................5

2 Normative references .......................................................................................................5

3 Terms and definitions .......................................................................................................5

4 General requirements .......................................................................................................9

5 Standard ratings ...............................................................................................................9

6 Marking ............................................................................................................................9

7 General notes on tests ...................................................................................................10

7.1 Atmospheric conditions for testing.........................................................................10

7.2 Type tests .............................................................................................................11

7.3 Fuse-bases for tests..............................................................................................11

7.4 Nature of supply ....................................................................................................11

8 Dimensions and construction..........................................................................................12

8.1 Dimensions ...........................................................................................................12

8.2 Construction..........................................................................................................12

8.3 Terminations .........................................................................................................12

8.4 Alignment and configuration of terminations ..........................................................12

8.5 Soldered joints ......................................................................................................12

9 Electrical requirements ...................................................................................................12

9.1 Voltage drop..........................................................................................................12

9.2 Time/current characteristic ....................................................................................13

9.3 Breaking capacity..................................................................................................14

9.4 Endurance tests ....................................................................................................15

9.5 Maximum sustained dissipation .............................................................................16

9.6 Pulse tests ............................................................................................................16

9.7 Fuse-link temperature ...........................................................................................16

Annex A (informative) Colour coding for miniature fuse-links ...............................................17

Annex B (informative) Example presentations of time/current characteristic

Annex C (informative) Audit testing and surveillance – Guidelines for the application of

the principles of IECEE 03 (CB-FCS) to miniature fuse-links.................................................21

Bibliography..........................................................................................................................27

Figure A.1– Layout of colour bands.......................................................................................17

Figure B.1 – Example presentation of time/current characteristic, ratio 2:1 ...........................19

Figure B.2 – Example presentation of time/current characteristic, ratio 3:1 ...........................20

Figure C.1 – Example of a fuse-link description ....................................................................22

Table A.1 – Colour coding for miniature fuse-links ................................................................18

Table C.1 – Audit testing for option 3 ....................................................................................25

Table C.2 – Audit testing for option 4 ....................................................................................26

---------------------- Page: 6 ----------------------
60127-1  IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
MINIATURE FUSES –
Part 1: Definitions for miniature fuses and
general requirements for miniature fuse-links
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60127-1 has been prepared by subcommittee 32C: Miniature

fuses, of IEC technical committee 32: Fuses.

This second edition cancels and replaces the first edition (1988), together with amendment 1

(1999) and amendment 2 (2002), and constitutes a technical revision.

The major technical changes with regard to the first edition concern subclause 9.2.3 where

the nature of the current source has been clarified; in addition, IEC 60038: IEC standard

voltages, has been added to the list of normative references.
---------------------- Page: 7 ----------------------
– 4 – 60127-1  IEC:2006(E)
The text of this standard is based on the following documents:
FDIS Report on voting
32C/387/FDIS 32C/390/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This Part 1 of the IEC 60127 series covers definitions, general requirements and tests

applicable to all types of miniature fuses (e.g. cartridge fuse-links, sub-miniature fuse-links

and universal modular fuse-links). All subsequent parts of the complete series should be read

in conjunction with this Part 1.

IEC 60127 consists of the following parts, under the general heading Mi ni ature fuses:

Part 1: Definitions for miniature fuses and general requirements for miniature fuse-links

Part 2: Cartridge fuse-links
Part 3: Sub-miniature fuse-links

Part 4: Universal modular fuse-links (UMF) – Through-hole and surface mount types

Part 5: Guidelines for quality assessment of miniature fuse-links
Part 6: Fuse-holders for miniature fuse-links
Part 7: (Free for further documents)
Part 8: (Free for further documents)
Part 9: (Free for further documents)
Part 10: User guide for miniature fuses

The committee has decided that the contents of this publication will remain unchanged until

the maintenance result date indicated on the IEC web site 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.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 8 ----------------------
60127-1  IEC:2006(E) – 5 –
MINIATURE FUSES –
Part 1: Definitions for miniature fuses and
general requirements for miniature fuse-links
1 Scope and object

This part of IEC 60127 covers the general requirements and tests applicable to all types of

miniature fuse-links (e.g. cartridge fuse-links, sub-miniature fuse-links and universal modular

fuse-links) for the protection of electric appliances, electronic equipment and component parts

thereof normally intended to be used indoors.
Specific details covering each major subdivision are given in subsequent parts.

This standard does not apply to fuses for appliances intended to be used under special

conditions, such as in a corrosive or explosive atmosphere.
The object of this standard is

a) to establish uniform requirements for miniature fuses so as to protect appliances or parts

of appliances in the most suitable way,

b) to define the performance of the fuses, so as to give guidance to designers of electrical

appliances and electronic equipment and to ensure replacement of fuse-links by those of

similar dimensions and characteristics,
c) to define methods of testing,

d) to define maximum sustained dissipation of fuse-links to ensure good compatibility of

stated power acceptance when used with fuse-holders according to this standard (see

IEC 60127-6).
2 Normative references

The following referenced documents are indispensable for the application of this document.

For dated references, only the edition cited applies. For undated references, the latest edition

of the referenced document (including any amendments) applies.
IEC 60038, IEC standard voltages

IEC 60127-6:1994, Miniature fuses – Part 6: Fuse-holders for miniature fuse-links

Amendment 1 (1996)
Amendment 2 (2003)
3 Terms and definitions
For the purposes of this document, the following definitions apply.
3.1
fuse

device that, by the fusing of one or more of its specially designed and proportioned

components, opens the circuit in which it is inserted by breaking the current when this

exceeds a given value for a sufficient time
NOTE The fuse comprises all the parts that form the complete device.
---------------------- Page: 9 ----------------------
– 6 – 60127-1  IEC:2006(E)
3.2
miniature fuse
fuse in which the fuse-link is a miniature fuse-link
3.3
fuse-link

part of a fuse including the fuse-element(s) intended to be replaced after the fuse has

operated
3.4
enclosed fuse-link

fuse-link in which the fuse-element is totally enclosed, so that during operation within its

rating it cannot produce any harmful external effects, e.g. due to development of an arc, the

release of gas or the ejection of flame or metallic particles
3.5
miniature fuse-link

enclosed fuse-link of rated breaking capacity not exceeding 2 kA and which has at least one

of its principal dimensions not exceeding 10 mm
NOTE Principal dimensions are length, width, height and diameter.
3.6
sub-miniature fuse-link

miniature fuse-link of which the case (body) has no principal dimension exceeding 10 mm

NOTE Principal dimensions are length, width, height and diameter.
3.7
universal modular fuse-link

miniature fuse-link primarily adapted for direct electrical connection to printed circuit boards

or other conductive substrates, incorporating features designed to provide a degree of non-

interchangeability where necessary
3.8
fuse-link contact

conductive part of a fuse-link designed to engage with a fuse-base contact or with a fuse-

carrier contact
3.9
fuse-holder
combination of a fuse-base with its fuse-carrier
3.10
fuse-base
fuse-mount

fixed part of a fuse provided with contacts and terminals for connection to the system

3.11
fuse-base contact
fuse-mount contact

conductive part of a fuse-base, connected to a terminal designed to engage with a fuse-

carrier contact or with a fuse-link contact
3.12
fuse-carrier
movable part of a fuse designed to carry a fuse-link
---------------------- Page: 10 ----------------------
60127-1  IEC:2006(E) – 7 –
3.13
fuse-carrier contact

conductive part of a fuse-carrier connected to a fuse-link contact and designed to engage with

a fuse-base contact
3.14
fuse-element
part of the fuse-link designed to melt when the fuse operates
3.15
homogeneous series (of fuse-links)

series of fuse-links, deviating from each other only in such characteristics that, for a given

test, the testing of one or a reduced number of particular fuse-links of the series may be taken

as representative of all the fuse-links of the series

NOTE Fuse-links are considered as forming a homogeneous series when the characteristics comply with the

following:
– the bodies have the same dimensions, material and method of manufacture;

– the caps or other end closures of the body have the same dimensions, materials and method of attachment and

sealing;

– the granular filler, if any, of the body is of the same material and completeness of filling. It should be of the

same size or any variation of the grain size with current rating should be monotonous;

– the fuse-elements are of the same material with the same principles of design and construction; any changes of

fuse-element dimensions with current rating should be monotonous;
– the rated voltage is the same;

– for low-breaking capacity fuse-links it is only necessary to test the highest rated breaking capacity in a

homogeneous series.
3.16
rating

general term employed to designate the characteristic values that together define the working

conditions upon which the tests are based and for which the fuse is designed
Examples of rated values usually stated for fuses:
− voltage (U );
− current (I );
− breaking capacity.
3.17
time/current characteristics (of a fuse-link)

a) For a.c.: curve giving, under stated conditions of operation, the value of time expressed as

virtual time as a function of the prospective symmetrical current, expressed as the r.m.s.

value

b) For d.c.: curve giving, under stated conditions of operation, the value of time expressed as

actual time as a function of the d.c. prospective current

NOTE Time/current characteristics usually stated for a fuse-link relate to the pre-arcing time and the operating

time.
3.18
conventional non-fusing current

value of current specified as that which the fuse-link is capable of carrying for a specified time

(conventional time) without melting
3.19
prospective current (of a circuit and with respect to a fuse)

current that would flow in a circuit, if a fuse situated therein were replaced by a link of

negligible impedance
---------------------- Page: 11 ----------------------
– 8 – 60127-1  IEC:2006(E)
3.20
pre-arcing time (melting time)

interval of time between the beginning of a current large enough to cause a break in the fuse-

element and the instant when an arc is initiated
3.21
arcing time

interval of time between the instant of the initiation of the arc and the instant of final arc

extinction
3.22
operating time (total clearing time)
sum of the pre-arcing time and the arcing time
3.23
virtual time

value of I t divided by the value of the square of the value of the prospective current

NOTE The values of the virtual times, usually stated for a fuse-link, are the values of the pre-arcing time and of

the operating time.
3.24
I t (joule integral)
integral of the square of the current over a given time interval:
I²t = i dt
t = 0
2 2

NOTE 1 The pre-arcing I t is the I t integral extended over the pre-arcing time of the fuse.

2 2

NOTE 2 The operating I t is the I t integral extended over the operating time of the fuse.

NOTE 3 The energy in joules released in 1 Ω of resistance in a circuit protected by a fuse is equal to the value of

2 2
the operating I t expressed in A s.
3.25
breaking capacity of a fuse-link

value (r.m.s. for a.c.) of prospective current that a fuse-link is capable of breaking at a stated

voltage under prescribed conditions of use and behaviour
3.26
recovery voltage

voltage which appears across the terminals of a fuse after breaking of the current

NOTE This voltage may be considered in two successive intervals of time, one during which a transient voltage

exists, followed by a second one during which the power frequency or the steady-state recovery voltage exists.

3.27
maximum sustained dissipation

power dissipation of a fuse-link measured under prescribed conditions of measurement at the

maximum current level that can be sustained for a minimum of 1 h

NOTE 1 The figure for maximum sustained dissipation is used in connection with the maximum power acceptance

of fuse-holders for miniature fuse-links in accordance with IEC 60127-6.

NOTE 2 These values are often exceeded for short periods of time immediately before the fuse-element melts.

Values as high as twice the maximum sustained dissipation have been recorded.
---------------------- Page: 12 ----------------------
60127-1  IEC:2006(E) – 9 –
4 General requirements

Fuse-links shall be so constructed that they are reliable and safe in operation and consistent

in performance at any current up to and including the breaking capacity rating and at any

voltage up to the rated voltage, when used within the limits of this standard.

During normal use of the fuse-link and within the conditions given in this standard, no

permanent arc, no external arcing, nor any flame that can endanger the surroundings, shall

be produced. During the test for establishing the maximum sustained dissipation and after

operation, the fuse-link shall not have suffered damage hindering its replacement and the

marking shall still be legible.
In general, compliance is checked by carrying out all the tests specified.
5 Standard ratings
In the relevant standard sheets, values are given for
– rated voltage,
– rated current,
– rated breaking capacity.
6 Marking

Unless otherwise stated in subsequent parts, the requirements for marking are as follows:

6.1 Each fuse-link shall be marked with:

a) Rated current in milliamperes for rated currents below 1 A, and in amperes for rated

currents of 1 A or more. The marking of the rated current shall precede and be adjacent to

the marking of the rated voltage.

To accommodate existing practice in some countries, for the time being, the current may

also be indicated in fractions of ampere.
b) Rated voltage in volts (V).
c) Maker's name or trade mark.

d) A symbol denoting the relative pre-arcing time/current characteristic as given in the

relevant standard sheet. This symbol shall be placed before and adjacent to the rated

current.
These symbols read as follows:
FF: denoting very quick acting
F: denoting quick acting
M: denoting medium time-lag
T: denoting time-lag
TT: denoting long time-lag.
---------------------- Page: 13 ----------------------
– 10 – 60127-1  IEC:2006(E)
6.2 Marking shall be indelible and easily legible.

Compliance is checked by inspection and by rubbing the marking by hand for 15 s with a

piece of cloth soaked in water and again for 15 s with a piece of cloth soaked in petroleum

spirit.

NOTE 1 For petroleum spirit the use of an aliphatic solvent hexane, with an aromatics content of maximum 0,1 %

volume, a kauri-butanol value of 29, initial boiling point approximately 65 °C, dry-point approximately 69 °C and

specific gravity of approximately 0,68 is recommended.

NOTE 2 In the case of colour coding, the test for indelibility need not be applied.

6.3 The marking according to 6.1 shall be printed on the packing together with a reference to

this standard and an indication of the appropriate standard sheet. The marking on the packing

shall include the abbreviation A and mA.
Compliance is checked by inspection.

6.4 Further identification of the current rating and the time/current characteristics by means

of colour bands may be used.
Such an additional marking shall be in accordance with Annex A.
7 General notes on tests
Tests according to this standard are type tests.

It is recommended that where acceptance tests are required, they are chosen from the type

tests in this standard.
7.1 Atmospheric conditions for testing

7.1.1 Unless otherwise specified in subsequent parts, all tests shall be carried out under the

following atmospheric conditions:
– temperature between 15 °C and 35 °C;
– relative humidity between 45 % and 75 %;
4 5
– air pressure between 8,6 × 10 Pa and 1,06 × 10 Pa.

Where the above-mentioned conditions have a significant influence, they shall be kept

substantially constant during the tests.

Fuse-links shall be tested in the specified bases in free air, and be protected from draughts

and direct heat radiation. The position of the fuse-holder shall be horizontal.

If temperature has a marked effect on the results of the tests, these shall be performed at a

temperature of 23 °C ± 1 °C.

7.1.2 In every test report, the ambient temperature shall be stated. If the standard conditions

for relative humidity or pressure are not fulfilled during tests, a note to this effect shall be

added to the report.

Where tests are required at elevated temperatures, these tests shall be carried out at an

ambient temperature of 70 °C ± 2 °C, unless otherwise specified.
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60127-1  IEC:2006(E) – 11 –
7.2 Type tests
7.2.1 The number of fuse-links required shall be specified in subsequent parts.
Fuse-links shall
...