Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors (IEC 60947-7-4:2019)

This part of IEC 60947-7 specifies requirements for PCB terminal blocks primarily intended for
industrial or similar use.
Mounting and fixing on the printed circuit board is made by soldering, press-in or equivalent
methods to provide electrical and mechanical connection between copper conductors and the
printed circuit board.
This document applies to PCB terminal blocks intended to connect copper conductors, with or
without special preparation, having a cross-section between 0,08 mm2 and 300 mm2
(AWG 28-600 kcmil), intended to be used in circuits of a rated voltage not exceeding
1 000 V AC up to 1 000 Hz or 1 500 V DC.
NOTE 1 Large-cross-section terminal blocks are dedicated to the specific design of high-current PCBs. The range
up to 300 mm2 is kept to cover any possible application. Examples of high current PCBs and PCB terminal blocks
are shown in Annex C.
NOTE 2 AWG is the abbreviation of “American Wire Gage” (Gage (US) = Gauge (UK)).
1 kcmil = 1 000 cmil;
1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil;
1 mil = 1/1 000 inch.
This document can be used as a guide for special types of PCB terminal blocks with
components, such as disconnect units, integrated cartridge fuse-links and the like or with
other dimensions of conductors.
If applicable, in this document the term “clamping unit” is used instead of “terminal”. This is
taken into account in the case of references to IEC 60947-1.

Niederspannungsschaltgeräte - Teil 7-4: Hilfseinrichtungen - Leiterplatten-Anschlussklemmen für Kupferleiter (IEC 60947-7-4:2019)

Appareillage à basse tension - Partie 7-4: Matériels accessoires - Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre (IEC 60947-7-4:2019)

IEC 60947-7-4:2019 est disponible sous forme de IEC 60947-7-4:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60947-7-4:2018 spécifie les exigences concernant les blocs de jonction pour cartes de circuits imprimés destinés principalement à un usage industriel ou similaire. Le montage et la fixation sur la carte de circuits imprimés s'effectuent par brasage, insertion à force ou par des méthodes équivalentes afin d'assurer une connexion électrique et mécanique entre les conducteurs en cuivre et la carte de circuits imprimés. Le présent document s'applique aux blocs de jonction pour cartes de circuits imprimés destinés à connecter les conducteurs en cuivre, avec ou sans préparation spéciale, dont la section est comprise entre 0,08 mm2 et 300 mm2 (AWG 28-600 kcmil), destinés à être utilisés dans les 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 au maximum. Cette deuxième édition annule et remplace la première édition parue en 2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) essai complémentaire pour les blocs de jonction pour cartes de circuits imprimés à organes de serrage pour lesquels la pression de contact est transmise par des matériaux isolants; b) les couples de serrage des vis sont désormais présentés dans le Tableau 4 du présent document (ils étaient précédemment donnés dans le Tableau 4 de l'IEC 60947-1:2007); les couples de serrage sont donnés pour un type supplémentaire de vis; c) ajout de nouveaux critères pour la vérification de la résistance de contact; d) clarification de la description de l'essai d'échauffement (taux de réduction de l'intensité en fonction de la température); corrections de la séquence d'essais conformément à la Figure 4.

Nizkonapetostne stikalne in krmilne naprave - 7-4. del: Pomožna oprema - Priključni bloki na tiskanih vezjih za bakrene vodnike (IEC 60947-7-4:2019)

Ta del standarda IEC 60947-7 določa zahteve za priključne bloke na tiskanih vezjih, ki so prvotno namenjeni za industrijsko ali podobno uporabo.
Nameščanje in pritrjevanje na tiskana vezja se izvaja s spajkanjem, tiskanjem ali ekvivalentnimi metodami, da se zagotovi električni in mehanski stik med bakrenimi vodniki in tiskanim vezjem.
Ta dokument se uporablja za priključne bloke na tiskanih vezjih za povezovanje bakrenih vodnikov, s posebno pripravo ali brez nje, s prerezom med 0,08 mm2 in 300 mm2 (AWG 28–600 kcmil), namenjene za uporabo v tokokrogih, katerih nazivna napetost ne presega 1000 V izmenične napetosti s frekvenco do 1000 Hz ali 1500 V enosmerne napetosti.
OPOMBA 1: Priključni bloki z velikim prerezom so namenjeni za specifično zasnovo tiskanih vezij z visokim tokom. Vključen je razpon do 300 mm2, ki obsega katero koli posebno vrsto uporabe. Primeri tiskanih vezij z visokim tokom in priključnih blokov na tiskanih vezjih so prikazani v dodatku C.
OPOMBA 2: AWG je okrajšava za »American Wire Gage« (Gage (ZDA) = Gauge (Združeno kraljestvo)).
1 kcmil = 1000 cmil;
1 cmil = 1 krožni promil = površina kroga s premerom 1 promil;
1 mil = 1/1000 palca.
Ta dokument je mogoče uporabljati kot vodilo za posebne vrste priključnih blokov na tiskanih vezjih s komponentami, kot so odklopne enote, vgrajeni taljivi vložki varovalk in podobni, ali z drugimi dimenzijami vodnikov.
V tem dokumentu se namesto izraza »terminal« uporablja izraz »pritrdilna enota«. To se upošteva pri sklicevanju na standard IEC 60947-1.

General Information

Status
Published
Publication Date
25-Mar-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Mar-2019
Due Date
23-May-2019
Completion Date
26-Mar-2019

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Niederspannungsschaltgeräte - Teil 7-4: Hilfseinrichtungen - Leiterplatten-Anschlussklemmen für Kupferleiter (IEC 60947-7-4:2019)Appareillage à basse tension - Partie 7-4: Matériels accessoires - Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre (IEC 60947-7-4:2019)Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors (IEC 60947-7-4:2019)31.180SORãþHPrinted circuits and boards29.130.20Nizkonapetostne stikalne in krmilne napraveLow voltage switchgear and controlgearICS:Ta slovenski standard je istoveten z:EN IEC 60947-7-4:2019SIST EN IEC 60947-7-4:2019en01-maj-2019SIST EN IEC 60947-7-4:2019SLOVENSKI

STANDARDSIST EN 60947-7-4:20141DGRPHãþD
SIST EN IEC 60947-7-4:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN IEC 60947-7-4
March 2019 ICS 29.130.20
Supersedes
EN 60947-7-4:2013
English Version

Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors (IEC 60947-7-4:2019)

Appareillage à basse tension - Partie 7-4: Matériels accessoires - Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre (IEC 60947-7-4:2019)

Niederspannungsschaltgeräte - Teil 7-4: Hilfseinrichtungen - Leiterplatten-Anschlussklemmen für Kupferleiter (IEC 60947-7-4:2019) This European Standard was approved by CENELEC on 2019-02-22. 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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization

Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23,

B-1040 Brussels © 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 60947-7-4:2019 E SIST EN IEC 60947-7-4:2019

EN IEC 60947-7-4:2019 (E) 2 European foreword The text of document 121A/255/FDIS, future edition 2 of IEC 60947-7-4, prepared by SC 121A "Low-voltage switchgear and controlgear" of IEC/TC 121 "Switchgear and controlgear and their assemblies for low voltage" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 60947-7-4:2019. The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2019-11-22 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2022-02-22

This document supersedes EN 60947-7-4:2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice The text of the International Standard IEC 60947-7-4:2019 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 60512-2-1 NOTE Harmonized as EN 60512-2-1 IEC 60512-5-1 NOTE Harmonized as EN 60512-5-1 IEC 60512-9-5:2010 NOTE Harmonized as EN 60512-9-5:2010 (not modified) IEC 60664-1:2007 NOTE Harmonized as EN 60664-1:2007 (not modified) IEC 60695-10-2 NOTE Harmonized as EN 60695-10-2 IEC 60695-11-5 NOTE Harmonized as EN 60695-11-5 IEC 60947-7-1:2009 NOTE Harmonized as EN 60947-7-1:2009 (not modified) IEC 60998-1:2002 NOTE Harmonized as EN 60998-1:2004

IEC 61984 NOTE Harmonized as EN 61984
SIST EN IEC 60947-7-4:2019
EN IEC 60947-7-4:2019 (E) 3 Annex ZA (normative)

Normative references to international publications with their corresponding European publications The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 1

Where an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

NOTE 2

Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu.

Publication Year Title EN/HD Year IEC 60068-2-20 -

Environmental testing - Part 2-20: Tests - Test T: Test methods for solderability and resistance to soldering heat of devices with leads EN 60068-2-20 -

IEC 60352-1 -

Solderless connections - Part 1: Wrapped connections - General requirements, test methods and practical guidance EN 60352-1 -

IEC 60352-2 -

Solderless connections - Part 2: Crimped connections - General requirements, test methods and practical guidance EN 60352-2 -

IEC 60352-3 -

Solderless connections - Part 3: Solderless accessible insulation displacement connections - General requirements, test methods and practical guidance EN 60352-3 -

IEC 60352-4 -

Solderless connections - Part 4: Solderless non-accessible insulation displacement connections - General requirements, test methods and practical guidance EN 60352-4 -

IEC 60352-5 -

Solderless connections - Part 5: Press-in connections - General requirements, test methods and practical guidance EN 60352-5 -

IEC 60352-6 -

Solderless connections - Part 6: Insulation piercing connections - General requirements, test methods and practical guidance EN 60352-6 -

IEC 60352-7 -

Solderless connections - Part 7: Spring clamp connections - General requirements, test methods and practical guidance EN 60352-7 -

IEC 60512-2-2 2003

Connectors for electronic equipment - Tests and measurements - Part 2-2: Electrical continuity and contact resistance tests - Test 2b: Contact resistance - Specified test current method EN 60512-2-2 2003

SIST EN IEC 60947-7-4:2019
EN IEC 60947-7-4:2019 (E) 4 IEC 60512-4-1 -

Connectors for electronic equipment - Tests and measurements - Part 4-1: Voltage stress tests - Test 4a: Voltage proof EN 60512-4-1 -

IEC 60512-5-2 2002

Connectors for electronic equipment - Tests and measurements - Part 5-2: Current-carrying capacity tests - Test 5b: Current-temperature derating EN 60512-5-2 2002

IEC 60512-11-7 -

Connectors for electronic equipment - Tests and measurements - Part 11-7: Climatic tests - Test 11g: Flowing mixed gas corrosion test EN 60512-11-7 -

IEC 60512-11-9 -

Connectors for electronic equipment - Tests and measurements - Part 11-9: Climatic tests - Test 11i: Dry heat EN 60512-11-9 -

IEC 60512-11-10 -

Connectors for electronic equipment - Tests and measurements - Part 11-10: Climatic tests - Test 11j: Cold EN 60512-11-10 -

IEC 60695-2-10 -

Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure EN 60695-2-10 -

IEC 60695-2-11 -

Fire hazard testing - Part 2-11: Glowing/hot-wire based test methods - Glow-wire flammability test method for end-products (GWEPT) EN 60695-2-11 -

IEC 60695-2-12 -

Fire hazard testing - Part 2-12: Glowing/hot-wire based test methods - Glow-wire flammability index (GWFI) test method for materials EN 60695-2-12 -

IEC 60695-2-13 -

Fire hazard testing - Part 2-13: Glowing/hot-wire based test methods - Glow-wire ignition temperature (GWIT) test method for materials EN 60695-2-13 -

IEC 60947-1 2007
Low-voltage switchgear and controlgear - Part 1: General rules EN 60947-1 2007
+ A1 2010
+ A1 2011
+ A2 2014
+ A2 2014
IEC 60998-2-3 -

Connecting devices for low-voltage circuits for household and similar purposes - Part 2-3: Particular requirements for connecting devices as separate entities with insulation-piercing clamping units EN 60998-2-3 -

IEC 60999-1 -

Connecting devices - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units - Part 1: General requirements and particular requirements for clamping units for conductors from 0,2 mm2 up to 35 mm2 (included) EN 60999-1 -

IEC 60999-2 -

Connecting devices - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units - Part 2: Particular requirements for clamping units for conductors above 35 mm2 up to 300 mm2 (included) EN 60999-2 -

IEC 61210 -

Connecting devices - Flat quick-connect terminations for electrical copper conductors - Safety requirements EN 61210 -

SIST EN IEC 60947-7-4:2019
EN IEC 60947-7-4:2019 (E) 5 ISO 6998 -

Carbonaceous materials for the production of aluminium - Pitch for electrodes - Determination of coking value - -

SIST EN IEC 60947-7-4:2019
SIST EN IEC 60947-7-4:2019

IEC 60947-7-4 Edition 2.0 2019-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage switchgear and controlgear –

Part 7-4: Ancillary equipment – PCB terminal blocks for copper conductors
Appareillage à basse tension –

Partie 7-4: Matériels accessoires – Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre

INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE

ICS 29.130.20
ISBN 978-2-8322-6402-7
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. SIST EN IEC 60947-7-4:2019 colourinside

– 2 – IEC 60947-7-4:2019  IEC 2019 CONTENTS FOREWORD ........................................................................................................................... 4 INTRODUCTION ..................................................................................................................... 6 1 Scope .............................................................................................................................. 7 2 Normative references ...................................................................................................... 7 3 Terms and definitions ...................................................................................................... 9 4 Classification ................................................................................................................. 10 5 Characteristics .............................................................................................................. 10 5.1 Summary of characteristics ................................................................................... 10 5.2 Type of PCB terminal block ................................................................................... 10 5.3 Rated and limiting values ...................................................................................... 10 5.3.1 Rated voltages .............................................................................................. 10 5.3.2 Rated current ................................................................................................. 11 5.3.3 Standard cross-sections ................................................................................ 11 5.3.4 Maximum cross-section ................................................................................. 12 5.3.5 Connecting capacity ...................................................................................... 12 6 Product information ....................................................................................................... 13 6.1 Marking ................................................................................................................. 13 6.2 Additional information ........................................................................................... 13 7 Normal service, mounting and transport conditions ........................................................ 13 8 Constructional and performance requirements ............................................................... 13 8.1 Constructional requirements ................................................................................. 13 8.1.1 Clamping units ............................................................................................... 13 8.1.2 Mounting and installation ............................................................................... 14 8.1.3 Clearances and creepage distances .............................................................. 14 8.1.4 Terminal identification and marking ............................................................... 14 8.1.5 Resistance to abnormal heat and fire ............................................................. 15 8.1.6 Maximum cross-section and connecting capacity ........................................... 15 8.2 Performance requirements .................................................................................... 15 8.2.1 Temperature-rise (current-temperature derating) ........................................... 15 8.2.2 Dielectric properties ....................................................................................... 15 8.2.3 Short-time withstand current .......................................................................... 15 8.2.4 Contact resistance ......................................................................................... 16 8.2.5 Ageing tests .................................................................................................. 16 8.3 Electromagnetic compatibility (EMC) ..................................................................... 16 9 Tests ............................................................................................................................. 16 9.1 Kinds of test .......................................................................................................... 16 9.2 General ................................................................................................................. 16 9.3 Verification of mechanical characteristics .............................................................. 17 9.3.1 General ......................................................................................................... 17 9.3.2 Attachment of the PCB terminal block on its support ...................................... 17 9.3.3 Vacant ........................................................................................................... 18 9.3.4 Verification of the maximum cross-section and connecting capacity ............... 18 9.3.5 Verification of maximum cross-section (special test with gauges) .................. 18 9.4 Verification of electrical characteristics ................................................................. 19 9.4.1 General ......................................................................................................... 19 SIST EN IEC 60947-7-4:2019

IEC 60947-7-4:2019  IEC 2019 – 3 –

9.4.2 Verification of clearances and creepage distances ......................................... 19 9.4.3 Dielectric tests ............................................................................................... 19 9.4.4 Verification of contact resistance ................................................................... 20 9.4.5 Temperature-rise test (current-temperature derating) .................................... 22 9.4.6 Short-time withstand current test ................................................................... 24 9.4.7 Ageing tests .................................................................................................. 25 9.5 Verification of thermal characteristics.................................................................... 29 9.6 Verification of EMC characteristics ........................................................................ 30 9.6.1 General ......................................................................................................... 30 9.6.2 Immunity ........................................................................................................ 30 9.6.3 Emission ........................................................................................................ 30 Annex A (informative)

Structure of a PCB terminal block ...................................................... 31 Annex B (informative)

Additional information to be specified between the manufacturer and the user ......................................................................................................................... 32 B.1 Additional information available on request of the user ......................................... 32 B.2 Information for testing in addition to those mentioned above ................................. 32 Annex C (informative)

Examples of PCBs and PCB terminal blocks for high-current application ............................................................................................................................ 33 C.1 Layout of high-current PCBs (schematic diagram) ................................................. 33 C.2 High-current PCB terminal blocks ......................................................................... 34 Bibliography .......................................................................................................................... 35

Figure 1 – Test assembly for the measurement of contact resistance and temperature-rise .. 22 Figure 2 – Example of wiring structure of a multi-tier PCB terminal block .............................. 23 Figure 3 – Test assembly for the measurement

of short-time withstand current .................... 25 Figure 4 – Test sequence ..................................................................................................... 26 Figure 5 – Test sequence for PCB terminal blocks with contact pressure via insulating material ................................................................................................................................ 27 Figure 6 – Current cycling ageing test procedure .................................................................. 29 Figure A.1 – Structure of a PCB terminal block ..................................................................... 31 Figure C.1 – Structure of a high current PCB ........................................................................ 33 Figure C.2 – PCB terminal block with soldered connection to the PCB .................................. 34 Figure C.3 – PCB terminal block with screwed connection to the PCB .................................. 34

Table 1 – Standard cross-sections of copper conductors ...................................................... 11 Table 2 – Relationship between maximum cross-section

and connecting capacity of PCB terminal blocks.............................................................................................................. 12 Table 3 – Standards for clamping units and connecting methods .......................................... 14 Table 4 – Tightening torques for PCB terminal blocks with screw-type clamping units ........... 18 Table 5 – Impulse withstand test voltages ............................................................................. 20 Table 6 – Dielectric test voltages corresponding to the rated insulation voltage .................... 20 Table 7 – Length of connectable conductors and conductor loops ......................................... 23 Table 8 – Examples of cross-sectional distribution

of interconnections on printed circuit boards ........................................................................................................................ 24

SIST EN IEC 60947-7-4:2019

– 4 – IEC 60947-7-4:2019  IEC 2019 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________

LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-4: Ancillary equipment –
PCB terminal blocks for copper conductors

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 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 60947-7-4 has been prepared by subcommittee 121A: Low-voltage switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and their assemblies for low voltage. This second edition cancels and replaces the first edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) additional test for PCB terminal blocks with clamping units, where contact pressure is transmitted through insulating materials; b) tightening torques for screws now given in Table 4 of this document (previously given in Table 4 of IEC 60947-1:2007); tightening torques added for an additional type of screw; c) new criteria for verification of contact resistance introduced; SIST EN IEC 60947-7-4:2019

IEC 60947-7-4:2019  IEC 2019 – 5 –

d) clarification in the description of the temperature-rise test (current-temperature derating); corrections in the test sequence according to Figure 4. The text of this International Standard is based on the following documents: FDIS Report on voting 121A/255/FDIS 121A/265/RVD

Full information on the voting for the approval of this International Standard can be found in the report on voting indicated in the above table. This document has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60947 series, published 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 document will remain unchanged until the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to the specific document. At this date, the document will be

• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.

SIST EN IEC 60947-7-4:2019

– 6 – IEC 60947-7-4:2019  IEC 2019 INTRODUCTION This document covers not only the terminal block requirements in accordance with the IEC 60947-7 series but also takes into account the specifications of connectors in accordance with IEC 61984 as the requirements for both components are highly similar owing to equivalent applications.

SIST EN IEC 60947-7-4:2019
IEC 60947-7-4:2019  IEC 2019 – 7 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 7-4: Ancillary equipment –
PCB terminal blocks for copper conductors

1 Scope This part of IEC 60947-7 specifies requirements for PCB terminal blocks primarily intended for industrial or similar use. Mounting and fixing on the printed circuit board is made by soldering, press-in or equivalent methods to provide electrical and mechanical connection between copper conductors and the printed circuit board. This document applies to PCB terminal blocks intended to connect copper conductors, with or without special preparation, having a cross-section between 0,08 mm2 and 300 mm2 (AWG 28-600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 V AC up to 1 000 Hz or 1 500 V DC. NOTE 1 Large-cross-section terminal blocks are dedicated to the specific design of high-current PCBs. The range up to 300 mm2 is kept to cover any possible application. Examples of high current PCBs and PCB terminal blocks are shown in Annex C. NOTE 2 AWG is the abbreviation of “American Wire Gage” (Gage (US) = Gauge (UK)). 1 kcmil = 1 000 cmil; 1 cmil = 1 circular mil = surface of a circle having a diameter of 1 mil; 1 mil = 1/1 000 inch. This document can be used as a guide for special types of PCB terminal blocks with components, such as disconnect units, integrated cartridge fuse-links and the like or with other dimensions of conductors. If applicable, in this document the term “clamping unit” is used instead of “terminal”. This is taken into account in the case of references to IEC 60947-1. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 60068-2-20, Environmental testing – Part 2-20: Tests – Test T: Test methods for solderability and resistance to soldering heat of devices with leads IEC 60352-1, Solderless connections – Part 1: Wrapped connections – General requirements, test methods and practical guidance IEC 60352-2, Solderless connections – Part 2: Crimped connections – General requirements, test methods and practical guidance SIST EN IEC 60947-7-4:2019

– 8 – IEC 60947-7-4:2019  IEC 2019 IEC 60352-3, Solderless connections – Part 3: Solderless accessible insulation displacement connections – General requirements, test methods and practical guidance IEC 60352-4, Solderless connections – Part 4: Solderless non-accessible insulation displacement connections – General requirements, test methods and practical guidance IEC 60352-5, Solderless connections – Part 5: Press-in connections – General requirements, test methods and practical guidance IEC 60352-6, Solderless connections – Part 6: Insulation piercing connections – General requirements, test methods and practical guidance IEC 60352-7, Solderless connections – Part 7: Spring clamp connections – General requirements, test methods and practical guidance IEC 60512-2-2:2003, Connectors for electronic equipment – Tests and measurements –

Part 2-2: Electrical continuity and contact resistance tests – Test 2b: Contact resistance –Specified test current method IEC 60512-4-1, Connectors for electronic equipment – Tests and measurements – Part 4-1:

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