ISO 8820-4:2016

INTERNATIONAL ISO
STANDARD 8820-4
Third edition
2016-11-15
Road vehicles — Fuse-links —
Part 4:
Fuse-links with female contacts (type
A) and bolt-in contacts (type B) and
their test fixtures
Véhicules routiers — Liaisons fusibles —
Partie 4: Liaisons fusibles avec contacts femelles (type A) et contacts
boulonnés (type B) et leurs montages d’essai
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking, labelling and colour coding . 1
5 Tests and requirements . 2
5.1 General . 2
5.2 Test sequence . 4
5.3 Test cable sizes . 5
5.4 Voltage drop . 5
5.4.1 Tests . 5
5.4.2 Requirements . 5
5.5 Transient current cycling . 6
5.5.1 Test . 6
5.5.2 Requirements . 6
5.6 Environmental condition . 7
5.7 Operating time-rating . 7
5.7.1 Test . 7
5.7.2 Requirements . 7
5.8 Current steps . 8
5.8.1 Test . 8
5.8.2 Requirements . 8
5.9 Breaking capacity . 8
5.9.1 Test . 8
5.9.2 Requirements . 8
5.10 Strength of terminals . 8
5.10.1 Test for fuse-links of types A1, A1S, A2, A3 and A4 . 8
5.10.2 Requirements . 9
5.10.3 Test for fuse-links of types B1 and B2 . 9
5.10.4 Requirements . 9
5.11 Temperature rise . 9
5.11.1 Test . 9
5.11.2 Requirements .10
5.12 Rapid change of temperature with specified transition duration .10
6 Dimensions .10
6.1 Fuse-links types A1, A2 and A3 .10
6.2 Fuse-links types A1S and A4 .11
6.3 Fuse-links types B1 and B2 .12
6.4 Designation .13
7 Test fixtures .14
7.1 Test fixture for fuse-links types A1, A1S, A2, A3 and A4 .14
7.2 Test fixture for fuse-links type B1 .15
7.3 Test fixture for fuse-links type B2 .16
Annex A (informative) Tab dimensions for fuse-boxes .17
Bibliography .18
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 32, Electrical
and electronic components and general system aspects.
This third edition cancels and replaces the second edition (ISO 8820-4:2010), which has been technically
revised.
A list of all parts in the ISO 8820 series can be found on the ISO website.
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 8820-4:2016(E)
Road vehicles — Fuse-links —
Part 4:
Fuse-links with female contacts (type A) and bolt-in
contacts (type B) and their test fixtures
1 Scope
This document specifies fuse-links with female contacts (type A) and bolt-in contacts (type B) for use in
road vehicles. It establishes, for these fuse-link types, the rated current, test procedures, performance
requirements and dimensions.
This document is applicable to fuse-links with a rated voltage of 32 V or 58 V, a current rating ≤140 A
and a breaking capacity of 1 000 A intended for road vehicles.
This document is intended to be used in conjunction with ISO 8820-1 and with ISO 8820-2. The
numbering of its clauses corresponds to that of ISO 8820-1 whose requirements are applicable, except
where modified by requirements particular to this document.
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.
ISO 8820-1, Road vehicles — Fuse-links — Part 1: Definitions and general test requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8820-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
4 Marking, labelling and colour coding
See ISO 8820-1 and Table 1.
Table 1 — Fuse-link colour coding
Fuse rating
Colour
A
15 Grey
20 Light blue
25 White
30 Pink
35 Dark green
40 Green
50 Red
60 Yellow
70 Brown
80 Black
100 Blue
120 White
140 Red-brown
5 Tests and requirements
5.1 General
In addition to carrying out the test procedures in accordance with ISO 8820-1, the following criteria
shall be observed.
Tests shall be performed following the test sequences in Table 2.
The test fixtures for electrical tests (see Annex A) shall be designed in accordance with Figure 1.
The connection resistance shall be for type A ≤1,0 mΩ and for type B ≤0,35 mΩ to ensure the proper
functioning of the test fixture.
Fuse-links in accordance with this document shall provide for visible evidence of an open fuse element.
For measuring the contact resistance of ty
...