ISO INTERNATIONAL STANDARD 10924-2 First edition 2014-02-15 Road vehicles Circuit breakers Part 2: User's guide Vehicules routiers-Coupe-circuits- Partie2:Guidede I'utilisateur Reference number IS010924-2:2014(E) LSO IS02014 ted without license from IHS Not for Resale IS010924-2:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2014 All rights reserved. Unless otherwise specified, 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 on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 4122 749 0111 Fax +41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2014- All rights reserved No reproduction or networking permited without license from IHS Not for Resale IS0 10924-2:2014(E) Contents Page Foreword ..iv 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions 4 General. .1 4.1 Circuit breaker nominal voltage .2 4.2 Supply voltage maximum (Usmax) .2 4.3 Rated current (Ir) and continuous current .2 5 Current and conductors (cables) ..3 6 Current and contact resistance .4 7 Current and ambient temperature ..4 8 Cable protection: temperatureversus current characteristics ..5 9 Selectivity .7 10 Replacement ofcircuit breakers. ..8 11 Voltagepeaksduringopeningofcircuitbreakers 12 Inrushwithstand characteristicsof circuitbreakers 13 Electromagneticcompatibility (EMC) Annex A (informative) Selection procedurefor circuit breakersand cables ..10 AnnexB (informative)Selectionofcircuitbreakers. .24 AnnexC(informative)Ambienttemperatureinfluence .25 iii rStand cense from IHS Not for Resale