ISO 20934:2019

INTERNATIONAL ISO
STANDARD 20934
First edition
2019-04
Road vehicles — Fuse-links with
axial terminals for use in 48V
networks — Types SF36-70V, SF51-
70V and SF56-70V
Véhicules routiers — Liaisons fusibles avec languettes axiales pour
réseaux 48V — Types SF36-70V, SF51-70V et SF56-70V
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking, labelling and colour coding . 1
5 Design and test requirements . 2
5.1 General . 2
5.1.1 General test conditions . 2
5.1.2 General performance requirements . 2
5.1.3 General fuse-link requirements . 3
5.1.4 Test sequence . . . 3
5.1.5 Test cable size . 4
5.2 Voltage drop . 4
5.2.1 Purpose . 4
5.2.2 Test . 4
5.2.3 Requirement . 4
5.3 Current cycling . 5
5.3.1 Purpose . 5
5.3.2 Test . 5
5.3.3 Requirement . 6
5.4 Environmental conditions . 6
5.4.1 Purpose . 6
5.4.2 Mechanical Shock and Vibration test . 6
5.4.3 Climatic loads. 7
5.4.4 Chemical loads . 7
5.4.5 Temperature shock . 7
5.4.6 Requirement . 7
5.5 Operating time rating . 7
5.5.1 Purpose . 7
5.5.2 Test . 7
5.5.3 Requirement . 7
5.6 Current steps . 8
5.6.1 Purpose . 8
5.6.2 Test . 8
5.6.3 Requirement . 8
5.7 Breaking capacity . 8
5.7.1 Purpose . 8
5.7.2 Test . 8
5.7.3 Requirement . 9
5.8 Mechanical stability . 9
5.8.1 Purpose . 9
5.8.2 Test . 9
5.8.3 Requirement . 9
5.9 Insulation resistance . 9
5.9.1 Purpose . 9
5.9.2 Test . 9
5.9.3 Requirement . 9
5.10 Cold resistance .10
5.10.1 Purpose .10
5.10.2 Test .10
5.10.3 Requirement .11
5.11 Overload test .11
5.11.1 Purpose .11
5.11.2 Test .11
5.11.3 Requirement .11
6 Dimensions and examples of designation .11
6.1 Type SF36-70V .11
6.1.1 Dimensions bolt-down .11
6.1.2 Dimensions clinchable .12
6.2 Type SF51-70V .13
6.3 Type SF56-70V .14
6.4 Designation example .15
7 Test fixture .15
7.1 SF36-70V .15
7.2 SF51-70V .16
7.3 SF56-70V .16
Annex A (informative) Optional tests .18
Bibliography .20
iv © ISO 2019 – All rights reserved

Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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INTERNATIONAL STANDARD ISO 20934:2019(E)
Road vehicles — Fuse-links with axial terminals for use in
48V networks — Types SF36-70V, SF51-70V and SF56-70V
1 Scope
This document specifies fuse-links with axial terminals (Strip fuse-links) Types SF36-70V, SF51-70V
and SF56-70V used 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 70 V DC, a rated current of 30 A to
500 A, and a breaking capacity of 2 500 A intended for use in the electrical system of road vehicles with
a nominal voltage of 48 V DC.
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 6722-1, Road vehicles — 60 V and 600 V single-core cables — Part 1: Dimensions, test methods and
requirements for copper conductor cables
ISO 8820-1:2014, Road vehicles — Fuse-links — Part 1: Definitions and general test requirements
ISO 16750-3:2012, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 3: Mechanical loads
ISO 16750-5:2010, Road vehicles — Environmental conditions and testing for electrical and
...