ISO 7638-1:2018

INTERNATIONAL ISO
STANDARD 7638-1
Third edition
2018-05
Road vehicles — Connectors for the
electrical connection of towing and
towed vehicles —
Part 1:
Connectors for braking systems and
running gear of vehicles with 24 V
nominal supply voltage
Véhicules routiers — Connecteurs pour liaisons électriques entre
véhicules tracteurs et véhicules tractés —
Partie 1: Connecteurs pour les équipements de freinage et les organes
de roulement des véhicules à tension nominale de 24 V
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensional characteristics . 2
4.1 General . 2
4.2 Plug . 2
4.3 Socket . 2
4.4 Park socket . 2
5 Application of the connector . 2
5.1 General . 2
5.2 Contact allocation . 6
5.3 Contact designation . 7
5.4 Terminals . 7
5.5 Connecting cable . 7
6 Tests and specific requirements . 7
6.1 General . 7
6.2 Mismating . 8
6.3 Connection and disconnection . 8
6.4 Endurance . 8
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
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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 documents 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).
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. Details of
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on the ISO list of patent declarations received (see www .iso .org/patents).
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URL: 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 third edition cancels and replaces the second edition (ISO 7638-1:2003), which has been technically
revised. The main changes compared to the previous edition are as follows:
— figures in the document have been revised.
A list of all the parts in the ISO 7638 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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