ISO 10924-4:2009

INTERNATIONAL ISO
STANDARD 10924-4
First edition
2009-12-01

Road vehicles — Circuit breakers —
Part 4:
Medium circuit breakers with tabs
(Blade type), Form CB15
Véhicules routiers — Coupe-circuits —
Partie 4: Coupe-circuits moyens à languettes (de type lame),
forme CB15




Reference number
ISO 10924-4:2009(E)
©
ISO 2009

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ISO 10924-4:2009(E)
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ii © ISO 2009 – All rights reserved

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ISO 10924-4:2009(E)
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
5.2 Voltage drop.4
5.3 Maximum housing temperature .5
5.4 Environmental conditions .5
5.5 Operating time-rating.5
5.6 Current steps .6
5.7 No current trip and reset temperature.6
5.8 Absolute breaking capacity.6
5.9 Breaking capacity.6
5.10 Strength of terminals .7
5.11 Endurance .7
5.12 Dielectric strength .8
6 Dimensions and designation .8
6.1 Dimensions .8
6.2 Designation example.13
Bibliography.14

© ISO 2009 – All rights reserved iii

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ISO 10924-4:2009(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 10924-4 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3,
Electrical and electronic equipment.
ISO 10924 consists of the following parts, under the general title Road vehicles — Circuit breakers:
⎯ Part 1: Definitions and general test requirements
⎯ Part 4: Medium circuit breakers with tabs (Blade type), Form CB15
The following part is under preparation:
⎯ Part 2: User's guide
The following parts are planned:
⎯ Part 3: Miniature circuit breakers with tabs (Blade type), Form CB11
⎯ Part 5: High current circuit breakers with tabs (Blade type), Form CB29
⎯ Part 6: Circuit breakers with bolt-in contacts

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INTERNATIONAL STANDARD ISO 10924-4:2009(E)

Road vehicles — Circuit breakers —
Part 4:
Medium circuit breakers with tabs (Blade type), Form CB15
1 Scope
This part of ISO 10924 specifies medium circuit breakers with tabs (Blade type), Form CB15, for use in road
vehicles. It establishes, for this circuit breaker form, the rated current, test procedures, performance
requirements and dimensions.
This part of ISO 10924 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 part of ISO 10924.
This part of ISO 10924 is applicable to circuit breakers with a rated voltage of 14 V or 28 V, a current rating of
no greater than 40 A and a breaking capacity of 2 000 A, intended for use in road vehicles with a nominal
voltage of 12 V or 24 V.
Circuit breakers differ in terms of dimensions and functions, e.g. electrically reset, automatic reset, manual
reset and switchable.
NOTE This type of circuit breaker is intended to be used in applications such as medium fuse-links in accordance
with ISO 8820-3. While the tab dimensions and current ratings can be the same, there might be differences in
performance, which it is advisable that the user of these products take into consideration.
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 8820-3, Road vehicles — Fuse-links — Part 3: Fuse-links with tabs (blade type) Type C (medium),
Type E (high current) and Type F (miniature)
ISO 10924-1, Road vehicles — Circuit breakers — Part 1: Definitions and general test requirements
ISO 16750-4, Road vehicles — Environmental conditions and testing for electrical and electronic
equipment — Part 4: Climatic loads
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10924-1 apply.
© ISO 2009 – All rights reserved 1

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ISO 10924-4:2009(E)
4 Marking, labelling and colour coding
See Table 1 and ISO 10924-1.
Table 1 — Colour code
Rated current
I Colour code
R
A
5 Tan/light brown
7,5 Brown
10 Red
15 Blue
20 Yellow
25 White
30 Green
35 Dark green
40 Orange

5 Tests and requirements
5.1 General
5.1.1 General test conditions
In addition to carrying out the test procedures in accordance with ISO 10924-1, the criteria below shall apply.
⎯ Tests shall be performed following the test sequences in T
...