IEC IEC60947-9-2 Edition1.02021-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage switchgear and controlgear- Part 9-2:Activearc-fault mitigation systems-Optical-based internal arc-detectionandmitigation devices Appareillageabassetension- Partie9-2:Systemesactifs de limitation des defauts d'arc-Dispositifsoptiques de detection et de limitation d'arcs internes IEC60947-9-2:2021-04(en-fr THISPUBLICATIONISCOPYRIGHTPROTECTED Copyright 2021 IEC, Geneva, Switzerland Allrights reserved. Unless otherwise specified, no partof this publication maybe reproduced orutilized in anyform or by any means,electronic or mechanical, including photocopying and microfilm, without permission in writing from copyright orhave anenquiry aboutobtaining additional rights tothispublication,pleasecontact theaddress below or yourlocal IECmemberNational Committeeforfurtherinformation. Droits de reproduction reserves. Sauf indication contraire, aucune partie de cette publication ne peut etre reproduite ni utilisee sous quelque forme que ce soit et paraucun procede, electronique ou mecanique, y compris la photocopie etles microfilms,sansI'accord écrit deIiECouduComite national deIlECdu paysdu demandeur.Si vousavez des questions surle copyright deI'lECou sivous desirezobtenir desdroits supplementaires sur cettepublication,utilisez lescoordonneesci-apresoucontactezleComitenational deIlECdevotre paysderesidence. IECCentral Office Tel.: +41 22 919 02 11 3,ruedeVarembe [email protected] CH-1211 Geneva 20 www.iec.ch Switzerland AbouttheIEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEc.Please make sure that you have the latest edition,a corrigendumoranamendmentmight havebeen published. IECpublicationssearch-webstore.iec.ch/advsearchform IEConlinecollection-oc.iec.ch Theadvanced search enablesto find IEC publicationsby a Discover our powerful search engine and read freely all the varietyofcriteria(referencenumber,text,technical publications previews.With a subscription you will always committee,...).Italsogivesinformationonprojects,replaced haveaccesstouptodatecontenttailoredtoyourneeds andwithdrawnpublications. Electropedia-www.electropedia.org IEc Just Published -webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology, Stayuptodate onall newIECpublications.Just Published containing more than 22 000 terminological entries in English details all new publications released.Available online and and French, with equivalent terms in 18 additional languages. onceamonthbyemail. Also known as the International Electrotechnical Vocabulary (IEV) online IECCustomerServiceCentre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or needfurtherassistance,pleasecontactthe CustomerService Centre:[email protected]. AproposdeIIEc Normes internationales pourtout cequi atraita l'electricite,a 'electronique et auxtechnologies apparentees AproposdespublicationsIEc Lecontenutechnique despublicationsIECest constamment revu.Veuillezvous assurer quevous possedezI'éditionla plusrecente,uncorrigendumouamendementpeutavoir etepublie. IEC online collection- oc.iec.ch RecherchedepublicationsIEc Decouvrez notre puissant moteur de recherche et consultez webstore.iec.ch/advsearchform Larechercheavanceepermetdetrouverdespublications IEC gratuitementtous les apercus des publications.Avec un en utilisant differents criteres (numero dereference,texte, abonnement,vous aureztoujoursacces aun contenu a jour comite d'etudes,...).Elle donne aussi des informations sur adapte avosbesoins. lesprojetsetlespublicationsremplaceesouretirees. Electropedia-www.electropedia.org IEc Just Published -webstore.iec.ch/justpublished Le premier dictionnaire d'electrotechnologie en ligne au Restez informe sur les nouvell