Low-voltage switchgear and controlgear - Part 7-3: Ancillary equipment - Safety requirements for fuse terminal blocks (IEC 60947-7-3:2009)

This part of IEC 60947 applies to fuse terminal blocks with screw-type or screwless-type clamping units for the connection of rigid (solid or stranded) or flexible copper conductors for the reception of cartridge fuse-links in accordance with IEC 60127-2, intended primarily for industrial or similar use in circuits not exceeding 1000 V a.c., up to 1000 Hz or 1500 V d.c., and having a maximum short-circuit breaking capacity of 1500 A. They are intended for installation in electrical equipment with enclosures which surround the fuse terminal blocks to such an extent that they are accessible only with the aid of a tool. For certain applications, for example in control circuits, the fuse terminal blocks may be designed exclusively for short-circuit protection. The object of this standard is to specify safety requirements and test methods for the mechanical, electrical and thermal characteristics of fuse terminal blocks, to ensure the compatibility between terminal blocks and standardized fuse-links. This standard may be used as a guide for - fuse terminal blocks requiring the fixing of special devices to the conductors, for example quick connect terminations or wrapped connections, etc.; - fuse terminal blocks providing direct contact to the conductors by means of edges or points penetrating the insulation, for example insulation displacement connections, etc. There applicable in this standard, the term "clamping unit" has been used instead of the term "terminal". This is taken into account in case of reference to IEC 60947-1.

Niederspannungsschaltgeräte - Teil 7-3: Hilfseinrichtungen - Sicherheitsanforderungen für Sicherungs-Reihenklemmen (IEC 60947-7-3:2009)

Appareillage à basse tension - Partie 7-3: Matériels accessoires - Prescriptions de sécurité pour les blocs de jonction à fusible (CEI 60947-7-3:2009)

La CEI 60947-7-3:2009 s'applique aux blocs de jonction à fusible avec des organes de serrage du type à vis ou du type sans vis, prévus pour le raccordement de conducteurs en cuivre rigides (à âme massive ou à âme câblée) ou souples conçus pour recevoir des éléments de remplacement à cartouche selon la CEI 60127-2, destinés principalement à des usages industriels ou usages similaires et à être insérés dans des circuits dont la tension assignée ne dépasse pas 1 000 V en courant alternatif jusqu'à 1 000 Hz ou 1 500 V en courant continu et ayant un pouvoir de coupure maximal de 1 500 A. Ils sont destinés à être installés dans des équipements électriques sous enveloppes qui enferment les blocs de jonction à fusible de manière à ce qu'ils ne soient accessibles qu'à l'aide d'un outil. Pour certaines applications, par exemple dans des circuits de commande, les blocs de jonction à fusible peuvent être conçus exclusivement pour la protection contre les courts-circuits. La présente norme a pour objet de spécifier les exigences de sécurité et les méthodes d'essai pour les caractéristiques mécaniques, électriques et thermiques des blocs de jonction à fusible, pour assurer la compatibilité entre les blocs de jonctions et les éléments de remplacement normalisés. La présente norme peut servir de guide pour - les blocs de jonction à fusible nécessitant la fixation de pièces spéciales sur les conducteurs, par exemple les connexions rapides ou les connexions enroulées, etc.; - les blocs de jonction à fusible assurant un contact direct avec les conducteurs au moyen de lames ou de pointes pénétrant à travers l'enveloppe isolante, par exemple les connexions par déplacement d'isolant, etc. Dans la présente norme, le terme 'organe de serrage' a été utilisé, s'il y a lieu, à la place du terme 'borne'. Cela est pris en compte en cas de référence à la CEI 60947-1. Les modifications techniques majeures de la présente norme depuis la précédente publication sont listées ci-dessous: - les exigences concernant les distances d'isolement et les lignes de fuite ont été remplacées par la référence à l'Annexe H de la CEI 60947-1; - en 8.3.3.1, les exigences pour l'essai de tenue mécanique des organes de serrage ont été améliorées; - les exigences concernant les couples de serrage pour les essais ont été améliorées et référencées au Tableau 4 de la CEI 60947-1; - les exigences pour la tenue et les dimensions des éléments de remplacement conventionnels ont été spécifiées en 8.5.2.5. Cette publication doit être lue conjointement avec la CEI 60947-1:2007 et la CEI 60947-7-1:2009.

Nizkonapetostne stikalne in krmilne naprave - 7-21. del: Pomožna oprema - Varnostne zahteve za priključne bloke z varovalkami (IEC 60947-7-3:2009)

Ta del IEC 60947 velja za priključne bloke z varovalkami z vijačnimi ali nevijačnimi pritrdilnimi enotami za povezavo togih (trdnih ali sukanih) ali gibkih bakrenih vodnikov za sprejem patronskih taljivih vložkov v skladu z IEC 60127-2, ki so namenjeni predvsem industrijski ali podobni uporabi v tokokrogih, ki ne presegajo 1000 V izmeničnega toka, do 1000 Hz, ali 1500 V enosmernega toka, in imajo maksimalno zmogljivost prekinitve kratkega stika 1500 A. Namenjeni so vgradnji v električno opremo z ograjenimi prostori, ki obdajajo priključne bloke z varovalkami do te mere, da so dostopni le s pomočjo orodja. Pri določenih uporabah, na primer v nadzornih tokokrogih, so lahko priključni bloki z varovalkami zasnovani izključno za zaščito pred kratkim stikom. Predmet tega standarda je opredeliti varnostne zahteve in preskusne metode za mehanske, električne in toplotne lastnosti priključnih blokov z varovalkami, da se zagotovi skladnost med priključnimi bloki z varovalkami in standardiziranimi taljivimi vložki. Ta standard se lahko uporabi kot vodilo za: – priključne bloke z varovalkami, ki zahtevajo pritrditev posebnih naprav na vodnike, na primer končnikov za hitro spajanje ali ovitih spojev itd.; - priključne bloke z varovalkami, ki zagotavljajo neposreden stik z vodniki s pomočjo robov ali točk, ki predirajo izolacijo, na primer spojke za spajanje brez snemanja izolacije, itd. V tem standardu se namesto izraza »terminal« uporablja izraz »pritrdilna enota«. To se upošteva pri sklicevanju na IEC 60947-1.

General Information

Status
Published
Publication Date
23-Dec-2009
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Dec-2009
Due Date
08-Feb-2010
Completion Date
24-Dec-2009

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SLOVENSKI STANDARD
SIST EN 60947-7-3:2010
01-februar-2010
1DGRPHãþD
SIST EN 60947-7-3:2003
1L]NRQDSHWRVWQHVWLNDOQHLQNUPLOQHQDSUDYHGHO3RPRåQDRSUHPD
9DUQRVWQH]DKWHYH]DSULNOMXþQHEORNH]YDURYDONDPL ,(&
Low-voltage switchgear and controlgear - Part 7-3: Ancillary equipment - Safety
requirements for fuse terminal blocks (IEC 60947-7-3:2009)

Niederspannungsschaltgeräte - Teil 7-3: Hilfseinrichtungen - Sicherheitsanforderungen

für Sicherungs-Reihenklemmen (IEC 60947-7-3:2009)

Appareillage à basse tension - Partie 7-3: Matériels accessoires - Prescriptions de

sécurité pour les blocs de jonction à fusible (CEI 60947-7-3:2009)
Ta slovenski standard je istoveten z: EN 60947-7-3:2009
ICS:
29.120.20 Spojni elementi Connecting devices
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60947-7-3:2010 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60947-7-3:2010
---------------------- Page: 2 ----------------------
SIST EN 60947-7-3:2010
EUROPEAN STANDARD
EN 60947-7-3
NORME EUROPÉENNE
November 2009
EUROPÄISCHE NORM
ICS 29.120.99; 29.130.20 Supersedes EN 60947-7-3:2002
English version
Low-voltage switchgear and controlgear -
Part 7-3: Ancillary equipment -
Safety requirements for fuse terminal blocks
(IEC 60947-7-3:2009)
Appareillage à basse tension - Niederspannungsschaltgeräte -
Partie 7-3: Matériels accessoires - Teil 7-3: Hilfseinrichtungen -
Exigences de sécurité pour les blocs Sicherheitsanforderungen
de jonction à fusible für Sicherungs-Reihenklemmen
(CEI 60947-7-3:2009) (IEC 60947-7-3:2009)

This European Standard was approved by CENELEC on 2009-09-01. 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 three official versions (English, French, 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, Bulgaria, 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: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60947-7-3:2009 E
---------------------- Page: 3 ----------------------
SIST EN 60947-7-3:2010
EN 60947-7-3:2009 - 2 -
Foreword

The text of document 17B/1657/FDIS, future edition 2 of IEC 60947-7-3, prepared by SC 17B,

Low-voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the

IEC-CENELEC parallel vote and was approved by CENELEC as EN 60947-7-3 on 2009-09-10.

This European Standard supersedes EN 60947-7-3:2002.

The main technical modifications of EN 60947-7-3:2009 since EN 60947-7-3:2002 are listed below:

– requirements regarding clearances and creepage distances replaced by reference to Annex H of

EN 60947-1;

– requirements for the test of the mechanical strength of the clamping units improved in 8.3.3.1;

– requirements for tightening torques for the tests improved and referenced to Table 4 of EN 60947-1;

– requirements for the resistance and the dimensions of dummy fuse-links specified in 8.5.2.5.

This standard shall be read in conjunction with EN 60947-1 and EN 60947-7-1. The provisions of the

general rules dealt with in EN 60947-1 and the requirements for terminal blocks of EN 60947-7-1 are

applicable to this standard, where specifically called for. Clauses and subclauses, tables, figures and

annexes thus applicable are identified by reference to EN 60947-1 or EN 60947-7-1, e.g. 1.2 of

EN 60947-1, Table 4 of EN 60947-7-1 or Annex A of EN 60947-1.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60947-7-3:2009 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60127-6 NOTE Harmonized as EN 60127-6:1994 + A1:1996 + A2:2003 (not modified).

+ A1
+ A2
IEC 60715 NOTE Harmonized as EN 60715:2001 (not modified).
+ A1
IEC 61180-1 NOTE Harmonized as EN 61180-1:1994 (not modified).
IEC 61180-2 NOTE Harmonized as EN 61180-2:1994 (not modified).
__________
---------------------- Page: 4 ----------------------
SIST EN 60947-7-3:2010
- 3 - EN 60947-7-3:2009
Annex ZA
(normative)
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
IEC 60127-1 2006 Miniature fuses - EN 60127-1 2006
Part 1: Definitions for miniature fuses and
general requirements for miniature fuse-links
IEC 60127-2 2003 Miniature fuses - EN 60127-2 2003
A1 2003 Part 2: Cartridge fuse-links A1 2003
IEC 60216-1 2001 Electrical insulating materials - Properties of EN 60216-1 2001
thermal endurance -
Part 1: Ageing procedures and evaluation of
test results
IEC 60695-11-5 2004 Fire hazard testing - EN 60695-11-5 2005
Part 11-5: Test flames - Needle-flame test
method - Apparatus, confirmatory test
arrangement and guidance
IEC 60947-1 2007 Low-voltage switchgear and controlgear - EN 60947-1 2007
Part 1: General rules
IEC 60947-7-1 - Low-voltage switchgear and controlgear - EN 60947-7-1 2009
Part 7-1: Ancillary equipment - Terminal
blocks for copper conductors
ISO 3 1973 Preferred numbers - Series of preferred - -
numbers
ISO 4046-4 2002 Paper, board, pulps and related terms - - -
Vocabulary -
Part 4: Paper and board grades and
converted products
Undated reference.
---------------------- Page: 5 ----------------------
SIST EN 60947-7-3:2010
---------------------- Page: 6 ----------------------
SIST EN 60947-7-3:2010
IEC 60947-7-3
Edition 2.0 2009-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –
Part 7-3: Ancillary equipment – Safety requirements for fuse terminal blocks
Appareillage à basse tension –
Partie 7-3: Matériels accessoires – Exigences de sécurité pour les blocs de
jonction à fusible
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.120.99; 29.130.20 ISBN 2-8318-1038-7
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60947-7-3:2010
– 2 – 60947-7-3 © IEC:2009
CONTENTS

FOREWORD...........................................................................................................................4

INTRODUCTION.....................................................................................................................6

1 General ............................................................................................................................7

1.1 Scope......................................................................................................................7

1.2 Normative references ..............................................................................................7

2 Definitions ........................................................................................................................8

3 Classification....................................................................................................................9

4 Characteristics .................................................................................................................9

4.1 Fuse-links ...............................................................................................................9

4.2 Rated power dissipation value.................................................................................9

4.2.1 Overload and short-circuit protection (P )....................................................9

4.2.2 Exclusive short-circuit protection (P )........................................................9

4.3 Rated and limiting values ........................................................................................9

4.3.1 Rated voltages ............................................................................................9

4.3.2 Void.............................................................................................................9

4.3.3 Standard cross-sections ..............................................................................9

4.3.4 Rated cross-section.....................................................................................9

4.3.5 Rated connecting capacity...........................................................................9

4.3.6 Working voltage.........................................................................................10

5 Product information ........................................................................................................10

5.1 Marking .................................................................................................................10

5.2 Additional information............................................................................................10

5.3 Marking on the packing unit...................................................................................10

6 Normal service, mounting and transport conditions......................................................... 11

6.1.1 Ambient temperature .................................................................................11

7 Constructional and performance requirements................................................................ 11

7.1 Constructional requirements..................................................................................11

7.1.1 Clamping units ..........................................................................................11

7.1.2 Mounting ...................................................................................................11

7.1.3 Clearances and creepage distances ..........................................................11

7.1.4 Terminal identification and marking ........................................................... 12

7.1.5 Void...........................................................................................................12

7.1.6 Rated cross-section and rated connecting capacity ...................................12

7.1.7 Void...........................................................................................................12

7.1.8 Actuating conditions ..................................................................................12

7.2 Performance requirements ....................................................................................12

7.2.1 Mechanical requirements during actuation.................................................12

7.2.2 Electrical requirements ..............................................................................12

7.2.3 Thermal requirements................................................................................13

7.3 Electromagnetic compatibility (EMC) .....................................................................13

8 Tests ..............................................................................................................................13

8.1 Kinds of test ..........................................................................................................13

8.2 General .................................................................................................................13

8.3 Verification of mechanical characteristics .............................................................. 13

8.3.1 General .....................................................................................................13

8.3.2 Attachment of the fuse terminal block on its support..................................14

---------------------- Page: 8 ----------------------
SIST EN 60947-7-3:2010
60947-7-3 © IEC:2009 – 3 –

8.3.3 Mechanical properties of clamping units of a fuse terminal block ............... 14

8.3.4 Compatibility between fuse terminal blocks and the fuse-link..................... 14

8.3.5 Mechanical strength of the connection between the terminal block

base and the fuse-carrier..........................................................................15

8.4 Verification of electrical characteristics.................................................................. 15

8.4.1 General .....................................................................................................15

8.4.2 Void...........................................................................................................16

8.4.3 Dielectric tests...........................................................................................16

8.4.4 Contact resistance.....................................................................................17

8.4.5 Temperature rise of clamping units............................................................18

8.4.6 Void...........................................................................................................18

8.4.7 Ageing test (for screwless-type fuse terminal blocks only) ......................... 18

8.5 Verification of thermal characteristics ....................................................................19

8.5.1 General .....................................................................................................19

8.5.2 Rated power dissipation ............................................................................20

8.5.3 Durability...................................................................................................24

8.5.4 Needle flame test ......................................................................................24

8.6 Verification of EMC characteristics ........................................................................ 26

Annex A (normative) Gauges ...............................................................................................27

Annex B (informative) Power dissipation values P and P ................................................28

V VK

Annex C (normative) Order of tests and number of specimens............................................. 36

Bibliography..........................................................................................................................37

Figure 1 − Test arrangement for the verification of the contact resistance............................. 17

Figure 2 − Test arrangement for separate arrangement ........................................................ 20

Figure 3 − Test arrangement for compound arrangement ...................................................... 21

Figure 4 − Test arrangement for compound arrangement of short-circuit protection .............. 22

Figure 5 − Test arrangement for the needle flame test ..........................................................25

Figure 6 − Point of test flame contact (view from the layer placed below the fuse

terminal block) ...................................................................................................................... 25

Figure A.1 – Outline of the gauges........................................................................................27

Figure B.1 – Derating curve in the case of exclusive short-circuit protection for a

separate arrangement...........................................................................................................30

Figure B.2 – Derating curve in the case of exclusive short-circuit protection for a

compound arrangement ........................................................................................................31

Figure B.3 – Derating curve in the case of overload and short-circuit protection for a

separate arrangement...........................................................................................................33

Figure B.4 – Derating curve in the case of overload and short-circuit protection for a

compound arrangement ........................................................................................................34

Table 1 − Test forces ............................................................................................................14

Table 2 − Dummy fuse-links..................................................................................................23

Table A.1 − Dimensions and materials for gauges for fuse-links according

to IEC 60127-2 .....................................................................................................................27

Table B.1 – Results of derating curves in the case of exclusive short-circuit protection......... 32

Table B.2 – Results of derating curves in case of overload and short-circuit protection........35

Table C.1 – Order of tests and number of specimens............................................................ 36

---------------------- Page: 9 ----------------------
SIST EN 60947-7-3:2010
– 4 – 60947-7-3 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-3: Ancillary equipment –
Safety requirements for fuse terminal blocks
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 60947-7-3 has been prepared by subcommittee 17B: Low-voltage

switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear.

This second edition of IEC 60947-7-3 cancels and replaces the first edition, published in 2002,

and constitutes a technical revision.

The main technical modifications of this standard since this previous publication are listed

below:

– requirements regarding clearances and creepage distances replaced by reference to

Annex H of IEC 60947-1;

– requirements for the test of the mechanical strength of the clamping units improved in

8.3.3.1;

– requirements for tightening torques for the tests improved and referenced to Table 4 of

IEC 60947-1;
---------------------- Page: 10 ----------------------
SIST EN 60947-7-3:2010
60947-7-3 © IEC:2009 – 5 –

– requirements for the resistance and the dimensions of dummy fuse-links specified in

8.5.2.5.

This standard shall be read in conjunction with IEC 60947-1 and IEC 60947-7-1. The

provisions of the general rules dealt with in IEC 60947-1 and the requirements for terminal

blocks of IEC 60947-7-1 are applicable to this standard, where specifically called for. Clauses

and subclauses, tables, figures and annexes thus applicable are identified by reference to

IEC 60947-1 or IEC 60947-7-1, e.g. 1.2 of IEC 60947-1, Table 4 of IEC 60947-7-1 or Annex A

of IEC 60947-1.
The text of this standard is based on the following documents:
FDIS Report on voting
17B/1657/FDIS 17B/1671/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.

A list of all the parts in the IEC 60947 series, under the general title Low-voltage switchgear

and controlgear, can be found on the IEC website.

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.
---------------------- Page: 11 ----------------------
SIST EN 60947-7-3:2010
– 6 – 60947-7-3 © IEC:2009
INTRODUCTION

The standard for fuse terminal blocks covers not only the terminal block requirements but also

takes into account the specifications of the cartridge fuse-links according to IEC 60127-1 and

IEC 60127-2. A connection between these two standards is made by adding (adapting) the

fundamental specifications of cartridge fuse-links (rated current, rated voltage, maximum

voltage drop and maximum sustained power dissipation for cartridge fuse-links with the

dimension of 5 mm × 20 mm or 6,3 mm × 32 mm with their different response characteristics)

to the IEC 60947-7-1 requirements for terminal blocks. By this means, it is possible to judge

the quality of the product “fuse terminal blocks”.

An important fact when using such cartridge fuse-links with fuse terminal blocks is that fuses

heat up much less under rated load than they would do under overload conditions. The rated

load is the result of rated current and maximum voltage drop. But there is a considerably

increased power dissipation under overload conditions, equalling the maximum sustained

power dissipation loss according to IEC 60127-2.

In industrial applications, single fuse terminal blocks are used within an arrangement of

terminal blocks or many of them forming an arrangement on their own. This means that the

same current and fuse-link will result in different heat emissions. Furthermore, it should be

taken into account that apart from the general full range fuse (for overload and short-circuit

protection), some fuse terminal blocks are exclusively used for short-circuit protection

according to IEC 60364-4-43, e.g. in control circuits, where no overloads occur (i.e. safety

coils, indicator lights or similar equipment).

Consequently there are four different types of application that need to be described in the

catalogue or indicated on the fuse terminal block. For more information, see Annex B.

---------------------- Page: 12 ----------------------
SIST EN 60947-7-3:2010
60947-7-3 © IEC:2009 – 7 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-3: Ancillary equipment –
Safety requirements for fuse terminal blocks
1 General
1.1 Scope

This part of IEC 60947 applies to fuse terminal blocks with screw-type or screwless-type

clamping units for the connection of rigid (solid or stranded) or flexible copper conductors for

the reception of cartridge fuse-links in accordance with IEC 60127-2, intended primarily for

industrial or similar use in circuits not exceeding 1 000 V a.c., up to 1 000 Hz or 1 500 V d.c.,

and having a maximum short-circuit breaking capacity of 1 500 A.

They are intended for installation in electrical equipment with enclosures which surround the

fuse terminal blocks to such an extent that they are accessible only with the aid of a tool.

For certain applications, for example in control circuits, the fuse terminal blocks may be

designed exclusively for short-circuit protection.

NOTE This standard may be used as a guide for fuse terminal blocks for the reception of special cartridge fuse-

links which do not meet the requirements of IEC 60127-2.

The object of this standard is to specify safety requirements and test methods for the

mechanical, electrical and thermal characteristics of fuse terminal blocks, to ensure the

compatibility between terminal blocks and standardized fuse-links.
This standard may be used as a guide for

− fuse terminal blocks requiring the fixing of special devices to the conductors, for example

quick connect terminations or wrapped connections, etc.;

− fuse terminal blocks providing direct contact to the conductors by means of edges or points

penetrating the insulation, for example insulation displacement connections, etc.

Where applicable in this standard, the term “clamping unit” has been used instead of the term

“terminal”. This is taken into account in case of reference to IEC 60947-1.
1.2 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 60127-1:2006, Miniature fuses – Part 1: Definitions for miniature fuses and general

requirements for miniature fuse-links
IEC 60127-2:2003, Miniature fuses – Part 2: Cartridge fuse-links
Amendment 1 (2003)

IEC 60216-1:2001, Electrical insulating materials – Properties of thermal endurance – Part 1:

Ageing procedures and evaluation of test results

IEC 60695-11-5:2004, Fire hazard testing – Part 11-5: Test flames – Needle flame test method

– Apparatus, confirmatory test arrangement and guidance
---------------------- Page: 13 ----------------------
SIST EN 60947-7-3:2010
– 8 – 60947-7-3 © IEC:2009
IEC 60947-1:2007, Low-voltage switchgear and controlgear – Part 1: General rules

IEC 60947-7-1, Low-voltage switchgear and controlgear – Part 7-1: Ancillary equipment –

Terminal blocks for copper conductors
ISO 3:1973, Preferred numbers – Series of preferred numbers

ISO 4046-4:2002, Paper, board, pulp and related terms – Vocabulary– Part 4: Paper and

board grades and coverted products
2 Definitions
For the purposes of this document, definitions give
...

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