ISO 25981:2008

Road vehicles — Connectors for the electrical connection of towing and towed vehicles — Connectors for electronically monitored charging systems with 12 V or 24 V nominal supply voltage

ISO 25981:2008 specifies dimensional characteristics, contact allocation, tests and requirements of 7-pole connectors for electrical connections of electronically monitored charging systems of towing and towed vehicles. The electronic monitoring system is designed to detect 12 V and 24 V nominal supply voltage and to limit the current to 50 A. This is a connector without breaking capacity. This electrical connection is intended for use with separable truck-trailer combinations in order to connect an additional battery pack of the trailer with the generator of the truck using an electronically monitored charging system. Additional battery packs in trailers are basically used with tailgate lifts, electrical forklifts or other technical equipment with high current consumption. ISO 25981:2008 further specifies a park socket used to receive and store the plug when it is disconnected.

Véhicules routiers — Raccords pour les connexions électriques des véhicules tracteurs et des véhicules tractés — Raccords pour systèmes de charge contrôlés électroniquement à tension d'alimentation nominale de 12 V ou 24 V

General Information

• Status: Withdrawn
• Publication Date: 23-Jan-2008
• Withdrawal Date: 23-Jan-2008
• 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/WG 9 - Electrical connections between towing and towed vehicles
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 10-Jul-2020

Relations

• Revised: ISO 25981:2020 - Road vehicles — Connectors for the electrical connection of towing and towed vehicles — Connectors for electronically monitored charging systems with 12 V or 24 V nominal supply voltage
• Effective Date: 23-Jul-2016

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 25981
First edition
2008-02-01

Road vehicles — Connectors for the
electrical connection of towing and towed
vehicles — Connectors for electronically
monitored charging systems with 12 V or
24 V nominal supply voltage
Véhicules routiers — Raccords pour les connexions électriques des
véhicules tracteurs et des véhicules tractés — Raccords pour systèmes
de charge contrôlés électroniquement à tension d'alimentation nominale
de 12 V ou 24 V



Reference number
ISO 25981:2008(E)
©
ISO 2008

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ISO 25981:2008(E)
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ISO 25981:2008(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 25981 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical
and electronic equipment.

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INTERNATIONAL STANDARD ISO 25981:2008(E)

Road vehicles — Connectors for the electrical connection of
towing and towed vehicles — Connectors for electronically
monitored charging systems with 12 V or 24 V nominal supply
voltage
1 Scope
This International Standard specifies dimensional characteristics, contact allocation, tests and requirements of
7-pole connectors for electrical connections of electronically monitored charging systems of towing and towed
vehicles. The electronic monitoring system is designed to detect 12 V and 24 V nominal supply voltage and to
limit the current to 50 A. This is a connector without breaking capacity.
This electrical connection is intended for use with separable truck-trailer combinations in order to connect an
additional battery pack of the trailer with the generator of the truck using an electronically monitored charging
system. Additional battery packs in trailers are basically used with tailgate lifts, electrical forklifts or other
technical equipment with high current consumption.
This International Standard further specifies a park socket used to receive and store the plug when it is
disconnected.
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 1185, Road vehicles — Connectors for the electrical connection of towing and towed vehicles — 7-pole
connector type 24 N (normal) for vehicles with 24 V nominal supply voltage
ISO 3731, Road vehicles — Connectors for the electrical connection of towing and towed vehicles — 7-pole
connector type 24 S (supplementary) for vehicles with 24 V nominal supply voltage
ISO 4009, Commercial vehicles — Location of electrical and pneumatic connections between towing vehicles
and trailers

ISO 4091, Road vehicles — Connectors for the electrical connection of towing and towed vehicles —
Definitions, tests and requirements
ISO 4141-3, Road vehicles — Multi-core connecting cables — Part 3: Construction, dimensions and marking
of unscreened sheathed low-voltage cables

ISO 7638-1, 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

ISO 7638-2, Road vehicles — Connectors for the electrical connection of towing and towed vehicles — Part 2:
Connectors for braking systems and running gear of vehicles with 12 V nominal supply voltage
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ISO 25981:2008(E)
ISO 12098, Road vehicles — Connectors for the electrical connection of towing and towed vehicles — 15-pole
connector for vehicles with 24 V nominal supply voltage
IEC 60512-13-5, Connectors for electronic equipment — Tests and measurements — Part 13-5: Mechanical
operation tests — Test 13e: Polarizing and keying method
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4091 apply.
4 Dimensions
4.1 General
Details not specified are at the manufacturer's discretion.
The contacts shall be floating and shall align to the datum position when plug and socket are engaged.
4.2 Plug
Dimensions of the plug shall be as in Figure 1.
The locking lever design shall take into consideration the space required for screws used to fasten the socket
(see section B-B in Figure 2).
4.3 Socket
Dimensions of the socket shall be as in Figure 2.
The cover is shown in opened position. It shall close automatically when the plug is disconnected.
4.4 Park socket
Dimensions of the park socket shall be as in Figure 3.
The cover is shown in closed position. It shall close automatically when the plug is disconnected.
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ISO 25981:2008(E)
Dimensions in millimetres

a
Dimension refers to the locking lever in its locked position.
b
Plug housing with 7 bushings and coding.
c
The sealing ring shall be mounted such that it cannot become detached under normal use.
d
Centre of cover rest.
e
See ISO 4141-3 for correct sealing.
f
Other housing designs are permitted in compliance with the maximum distance of 58 mm for the locking lever.
g 2 2
Contact bushing with 6,0 mm terminal for contacts 1 to 4 and 1,0 mm terminal for contacts 5 to 7.
h
Spring tube.
i
Contact numbers.
Figure 1 — Plug
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ISO 25981:2008(E)
Dimensions in millimetres

Figure 2 (continued)
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ISO 25981:2008(E)
Key
2
X contacts 1 to 4 with 6,0 mm terminal and 23,5 mm length
2
Y contacts 5 to 7 with 1,0 mm terminal and 19,5 mm length
a
The sealing ring shall be mounted such that it cannot become detached under normal use.
b
For existing products for which the cable outlet is mounted from the rear, the outside diameter of the outlet ma
...