ISO 8820-1:2014

INTERNATIONAL ISO
STANDARD 8820-1
Fourth edition
2014-12-01
Road vehicles — Fuse-links —
Part 1:
Definitions and general test
requirements
Véhicules routiers — Liaisons fusibles —
Partie 1: Définitions et exigences générales d’essai
Reference number
©
ISO 2014
© ISO 2014
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ii © ISO 2014 – 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 . 3
5 Tests and requirements . 3
5.1 General . 3
5.2 Voltage drop . 3
5.3 Transient current cycling . 4
5.4 Environmental conditions . 4
5.5 Operating time rating . 8
5.6 Current steps . 8
5.7 Breaking capacity . 8
5.8 Strength of terminals . 9
6 Dimensions .10
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).
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on the ISO list of patent declarations received (see www.iso.org/patents).
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assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 3, Electric
and electronic requirements.
This fourth edition cancels and replaces the third edition (ISO 8820-1:2008), which has been
technically revised.
ISO 8820 consists of the following parts, under the general title Road vehicles — Fuse-links:
— Part 1: Definitions and general test requirements
— Part 2: User guidelines
— Part 3: Fuse-links with tabs (blade type) Type C (medium), Type E (high current) and Type F (miniature)
— Part 4: Fuse-links with female contacts (type A) and bolt-in contacts (type B) and their test fixtures
— Part 5: Fuse-links with axial terminals (strip fuse-links) Types SF30 and SF51 and test fixtures
— Part 6: Single-bolt fuse-links
— Part 7: Fuse-links with tabs (Type G) with rated voltage of 450 V
— Part 8: Fuse-links with bold-in contacts (Type H and J) with rated voltage of 450 V
— Part 9: Fuse-links with shortened tabs (Type K)
— Part 10: Fuse-links with tabs Type L (high current miniature)
iv © ISO 2014 – All rights reserved

INTERNATIONAL STANDARD ISO 8820-1:2014(E)
Road vehicles — Fuse-links —
Part 1:
Definitions and general test requirements
1 Scope
This part of ISO 8820 defines terms and specifies general test requirements for fuse-links for electrical
DC systems of road vehicles.
This part of ISO 8820 is intended to be used in conjunction with other parts of ISO 8820, to which its
requirements are applicable except where modified by the particular requirements of another part.
This part of ISO 8820 is not applicable to fuse holders used in the vehicles.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 6722, Road vehicles — 60 V and 600 V single core cables — Dimensions, test methods and requirements
ISO 8820 (all parts), Road vehicles — Fuse-links
ISO 16750-3, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 3: Mechanical loads
ISO 16750-5, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 5: Chemical loads
IEC 60068-2-70, Environmental testing — Part 2: Tests — Test Xb: Abrasion of markings and letterings
caused by rubbing of fingers and hands
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8820-1 and the following apply.
3.1
breaking capacity
I
B
value of prospective breaking current a fuse-link is capable of breaking at rated voltage under prescribed
conditions of use and behaviour
3.2
fuse
protective device that interrupts the circuit irreversibly when the current flow reaches a specified value
for a specific time
Note 1 to entry: The fuse is an assembly of all parts forming the protective device. This includes the fuse holder
and the fuse-link.
3.3
fuse-element
active part of the fuse-link which interrupts the current and opens the circuit permanently in case of
an overcurrent
3.4
fuse holder
device connecting the fuse-link to the vehicle wiring harness
3.5
fuse-link
interchangeable part of the fuse, consisting of an insulator and electrical conducting parts such as the
terminals and the fuse element
3.6
insulator
electrical non-conductive mechanical support for the electrical conductive parts of the fuse-link
3.7
operating time
time between the application of an over current and the moment when the current drops below a value
as specified in the appropriate part of ISO 8820
3.8
operating time rating
operating time, as a function of the current under defined test conditions
3.9
rated current
I
R
current used for identifying the fuse-link, according to specified tests
3.10
rated voltage
U
R
maximum supply voltage for which the fuse-link is designed
3.11
selectivity
primary interruption of the fuse-element closest to the failure cause without damaging of the
upstream fuse-links
3.12
terminal
part of the fuse-link, that makes the mechanical and electrical connection of the fuse-link to the fuse holder
Note 1 to entry: The terminal includes contacts and tabs.
3.13
time constant
time required for a physical quantity to rise from 0 to 1 - 1/e (that is 63,2 %) of its final steady value
-kt
when it varies wi
...