ISO 10924-5:2025
(Main)Road vehicles — Circuit breakers — Part 5: Circuit breakers with bolt with rated voltage of 450 V
Road vehicles — Circuit breakers — Part 5: Circuit breakers with bolt with rated voltage of 450 V
This document specifies circuit breakers with a rated voltage of 450 V for use in road vehicles. It establishes, for this circuit breaker type, the rated current, test procedures, performance requirements and dimensions. This document is intended to be used in conjunction with ISO 10924-1 and with ISO 10924-2. The numbering of its clauses corresponds to that of ISO 10924-1 whose requirements are applicable, except where modified by requirements particular to this document. This document is applicable to circuit breakers with a rated voltage of 450 V (DC), a current rating of no greater than 300 A and a breaking capacity of 6 000 A.
Véhicules routiers — Coupe-circuits — Partie 5: Coupe-circuit moyen à boulon avec une tension nominale de 450 V
General Information
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Standards Content (Sample)
International
Standard
ISO 10924-5
Second edition
Road vehicles — Circuit breakers —
2025-03
Part 5:
Circuit breakers with bolt with
rated voltage of 450 V
Véhicules routiers — Coupe-circuits —
Partie 5: Coupe-circuit moyen à boulon avec une tension
nominale de 450 V
Reference number
© ISO 2025
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking, labelling and colour coding . 2
5 Tests and requirements . 2
5.1 General .2
5.1.1 General test conditions .2
5.1.2 Test sequence plan .3
5.1.3 Test cable sizes .3
5.2 Voltage drop .4
5.2.1 Purpose .4
5.2.2 Tests .4
5.2.3 Requirements .4
5.3 Maximum housing temperature .5
5.4 Environmental conditions .5
5.5 Operating time-rating .5
5.5.1 Purpose .5
5.5.2 Tests .5
5.5.3 Requirements .5
5.6 Current steps .5
5.7 No current trip and reset temperature .5
5.8 Absolute breaking capacity .6
5.8.1 Purpose .6
5.8.2 Tests .6
5.8.3 Requirements .6
5.9 Breaking capacity .6
5.9.1 Purpose .6
5.9.2 Tests .6
5.9.3 Requirements .6
5.10 Strength of terminals.7
5.10.1 Purpose .7
5.10.2 Tests .7
5.10.3 Requirements .7
5.11 Endurance .7
5.11.1 Purpose .7
5.11.2 Tests .7
5.11.3 Requirements .7
5.12 Dielectric strength .7
5.12.1 Purpose .7
5.12.2 Tests .7
5.12.3 Requirement .8
5.13 Pulse test.8
5.13.1 Purpose .8
5.13.2 Test . . .8
5.13.3 Requirement .8
6 Dimensions and designation example (Figure 2 and Table 8). 9
iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, 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 www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
This second edition cancels and replaces the first edition (ISO 10924-5:2016), which has been technically
revised.
The main changes are as follows:
— only editorial changes were made.
A list of all parts in the ISO 10924 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 10924-5:2025(en)
Road vehicles — Circuit breakers —
Part 5:
Circuit breakers with bolt with rated voltage of 450 V
1 Scope
This document specifies circuit breakers with a rated voltage of 450 V for use in road vehicles. It establishes,
for this circuit breaker type, the rated current, test procedures, performance requirements and dimensions.
This document is intended to be used in conjunction with ISO 10924-1 and with ISO 10924-2. The numbering
of its clauses corresponds to that of ISO 10924-1 whose requirements are applicable, except where modified
by requirements particular to this document.
This document is applicable to circuit breakers with a rated voltage of 450 V (DC), a current rating of no
greater than 300 A and a breaking capacity of 6 000 A.
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,
...
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