ISO 8820-1:2008

INTERNATIONAL ISO
STANDARD 8820-1
Third edition
2008-11-15

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 8820-1:2008(E)
©
ISO 2008

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ISO 8820-1:2008(E)
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ISO 8820-1:2008(E)
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 .5
5.5 Operating time rating .8
5.6 Current steps .8
5.7 Breaking capacity.9
5.8 Strength of terminals .10
6 Dimensions .10

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ISO 8820-1:2008(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 8820-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical
and electronic equipment.
This third edition cancels and replaces the second edition (ISO 8820-1:2002), 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's guide
⎯ Part 3: Fuse-links with tabs (blade type)
⎯ 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 SF 30 and SF 51 and test fixtures
⎯ Part 6: Single-bolt fuse-links
⎯ Part 7: Fuse-links with tabs (Type G) with rated voltage of 450 V

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INTERNATIONAL STANDARD ISO 8820-1:2008(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
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 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.
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 marking and letterings caused
by rubbing of fingers and hands
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
fuse
protective device that interrupts the circuit irreversibly when the current flow reaches a specified value for a
specific time
NOTE The fuse is an assembly of all parts forming the protective device. This includes the fuse holder and the fuse-
link.
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ISO 8820-1:2008(E)
3.1.1
fuse holder
device connecting the fuse-link to the vehicle wiring harness
3.1.2
fuse-link
interchangeable part of the fuse, consisting of an insulator and electrical conducting parts such as the
terminals and the fuse element
3.1.2.1
insulator
electrical non-conductive mechanical support for the electrical conductive parts of the fuse-link
3.1.2.2
terminal
part of the fuse-link that makes the mechanical and electrical connection of the fuse-link to the fuse holder
NOTE The terminal includes contacts and tabs.
3.1.2.3
fuse-element
active part of the fuse-link which interrupts the current and opens the circuit permanently in the case of an
over current
3.2
rated current
I
R
current used for identifying the fuse-link, according to specified tests
NOTE The continuous current is lower than the rated current.
3.3
rated voltage
U
R
maximum supply voltage for which the fuse-link is designed
3.4
voltage drop
U
D
voltage measured between specified measuring points at a specified current
3.5
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
3.6
time constant
time required for a physical quantity to rise from 0 to 1 − 1/e (i.e. 63,2 %) of its final steady value when it
−kt
varies with time, t, as 1 − 1
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
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ISO 8820-1:2008(E)
4 Marking, labelling and colour coding
The rated current and rated voltage shall be permanently marked to be externally visible on the fuse-link. In
addition, the current rating shall be shown by colour coding as specified in the applicable part of ISO 8820.
The
...