ISO 10924-1:2025

Road vehicles — Circuit breakers — Part 1: Definitions and general test requirements

This document defines terms and specifies general test requirements for circuit breakers for use in road vehicles with a nominal voltage of 12 V (DC), 24 V (DC), 48 V (DC) and 450 V (DC). This document is intended to be used in conjunction with ISO 10924-2, ISO 10924-3, ISO 10924-4 and ISO 10924-5. The numbering of its clauses corresponds to that of the document whose requirements are applicable, except where modified by requirements particular to this document. This document is not applicable to circuit breaker holders (electrical centres or fuse-holders) used in vehicles.

Véhicules routiers — Coupe-circuits — Partie 1: Définitions et exigences d'essais générales

General Information

• Status: Published
• Publication Date: 31-Mar-2025
• ICS: 43.040.10 - Electrical and electronic equipment
• Technical Committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
• Drafting Committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
• Current Stage: 6060 - International Standard published
• Start Date: 31-Mar-2025
• Due Date: 01-Apr-2025
• Completion Date: 01-Apr-2025

Relations

• Revises: ISO 10924-1:2016 - Road vehicles — Circuit breakers — Part 1: Definitions and general test requirements
• Effective Date: 06-Jun-2022

Standards Content (Sample)

International
Standard
ISO 10924-1
Third edition
Road vehicles — Circuit breakers —
2025-03
Part 1:
Definitions and general test
requirements
Véhicules routiers — Coupe-circuits —
Partie 1: Définitions et exigences d'essais générales
Reference number
© ISO 2025
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Published in Switzerland
ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Marking, labelling and colour coding . 5
5 Tests and requirements . 5
5.1 General .5
5.1.1 General test conditions .5
5.1.2 General performance requirements .6
5.2 Voltage drop .7
5.2.1 Purpose .7
5.2.2 Test . . .7
5.2.3 Requirement .7
5.3 Maximum housing temperature .7
5.3.1 Purpose .7
5.3.2 Test . . .7
5.3.3 Requirement .7
5.4 Environmental conditions .7
5.4.1 Purpose .7
5.4.2 Mechanical loads .7
5.4.3 Climatic loads .8
5.4.4 Chemical loads .8
5.5 Operating time rating .8
5.5.1 Purpose .8
5.5.2 Test . . .8
5.5.3 Requirement .8
5.6 Current steps .8
5.6.1 Purpose .8
5.6.2 Test . . .9
5.6.3 Requirement .9
5.7 No current trip and reset temperature .9
5.7.1 Purpose .9
5.7.2 Test . . .9
5.7.3 Requirement .9
5.8 Absolute breaking capacity .9
5.8.1 Purpose .9
5.8.2 Test . . .9
5.8.3 Requirement .10
5.9 Breaking capacity .10
5.9.1 Purpose .10
5.9.2 Test . . .10
5.9.3 Requirement .11
5.10 Strength of terminals. 12
5.10.1 Purpose . 12
5.10.2 Test . . . 12
5.10.3 Requirement . 12
5.11 Endurance . 12
5.11.1 Purpose . 12
5.11.2 Test . . . 12
5.11.3 Requirement . 13
5.12 Dielectric strength . 13
5.12.1 Purpose . 13
5.12.2 Test . . . 13
5.12.3 Requirement . 13

iii
Annex A (normative) Cycling profiles . 14
Annex B (normative) Test circuit . 17
Annex C (informative) Temperature rise test . 19

iv
Foreword
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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
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ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
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rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not
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