ISO INTERNATIONAL STANDARD 25981 Second edition 2020-07 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 Vehicules routiers -Connecteurs pour liaisons électriques entre vehicules tracteurs etvehicules tractes-Raccords poursystemes de charge controlés électroniquementatension d'alimentation nominale de12Vou24V Reference number IS0 25981:2020(E) ISO ISO2020 IS0 25981:2020(E) COPYRIGHTPROTECTEDDOCUMENT @IS02020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS025981:2020(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normative references 3 Terms and definitions 4 Dimensional ..2 4.1 General .2 4.2 Plug. 4.3 Socket. .2 4.4 Park socket 2 5 Application oftheconnector .6 5.1 General 6 5.2 Contact allocation .6 5.3 Contact designation. .7 5.4 Terminals .7 5.5 Connecting cable .7 5.6 Colouring of plug and socket .7 Tests and specific requirements .7 6 6.1 General .7 6.2 Mismating. .7 6.2.1 .7 Purpose 6.2.2 Test procedure .8 6.2.3 Requirement. .8 6.3 Connectionanddisconnection .8 6.4 Endurance. 6.5 Mechanical strength of mounting features .8 Annex A (normative) Minimumfunctionality ofthe monitoring device .9 Bibliography .10 @ IS0 2020 - All rights reserved ili