Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 11: EC-cores for use in power supply applications

This part of IEC 63093 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of EC-cores made of ferrite and the essential
dimensions of coil formers to be used with them, as well the effective parameter values to be
used in calculations involving them. It also gives guidelines on allowable limits of surface
irregularities applicable to EC-cores.
The specifications contained in this document are useful in negotiations between ferrite core
manufacturers and customers about surface irregularities.

Ferritkerne - Richtlinien zu Maßen und Grenzen von Oberflächenbeschädigungen - Teil 11: EC-Kerne für den Einsatz in Netzteilen

Noyaux ferrites - Lignes directrices relatives aux dimensions et limites des irrégularités de surface - Partie 11 : Noyaux EC utilisés dans des applications d'alimentation électrique

L’IEC 63093-11:2018 spécifie les dimensions importantes pour l’interchangeabilité mécanique d’une plage préférentielle de noyaux EC en matériaux ferrites et les dimensions essentielles des supports de bobines à utiliser avec, ainsi que les valeurs des paramètres effectifs destinées aux calculs les impliquant. Elle donne également les lignes directrices relatives aux limites admissibles des irrégularités de surface applicables aux noyaux EC.
Les spécifications du présent document sont utiles au dialogue entre les fabricants de noyaux en ferrite et leurs clients sur les irrégularités de surface.Cette première édition annule et remplace la première édition de l’IEC 62317-11 parue en 2015 et la deuxième édition de l’IEC 60424-3 parue en 2015. Cette édition constitue une révision technique.  
Ce document inclut les modifications techniques majeures suivantes par rapport à l'IEC 62317­11:2015 et à l’IEC 60424-3:2015:

  1. ce document intègre l’IEC 62317-11:2015 et l’IEC 60424­3:2015;

  3. le Tableau 3 – Surfaces admissibles des éclats pour les noyaux EC, de l’IEC 60424-3:2015, a été déplacé à l’Annexe B (informative) de ce document.

Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti - 11. del: EC-jedra za uporabo v napajalnikih

Ta del standarda IEC 63093 določa mere, ki so pomembne za mehansko medsebojno zamenljivost prednostnega razpona feritnih EC-jeder, bistvene mere tuljave, ki se uporablja s temi jedri, in vrednosti efektivnih parametrov, ki se uporabljajo pri izračunih, povezanih z jedri. Podaja tudi smernice glede omejitev površinskih nepravilnosti, ki veljajo za EC-jedra.
Specifikacije v tem dokumentu so uporabne za sklepanje dogovorov o površinskih nepravilnostih med proizvajalci in uporabniki feritnih jeder.

General Information

Publication Date
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
Due Date
Completion Date


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SIST EN IEC 63093-11:2019
SIST EN 60424-3:2016
SIST EN 62317-11:2016
Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti -
11. del: EC-jedra za uporabo v napajalnikih
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 11:
EC-cores for use in power supply applications
Ta slovenski standard je istoveten z: EN IEC 63093-11:2018
29.100.10 Magnetne komponente Magnetic components
SIST EN IEC 63093-11:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 63093-11:2019

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SIST EN IEC 63093-11:2019



August 2018
ICS 29.100.10

English Version
Ferrite cores - Guidelines on dimensions and the limits of
surface irregularities - Part 11: EC-cores for use in power supply
(IEC 63093-11:2018)
Noyaux ferrites - Lignes directrices relatives aux Ferritkerne - Richtlinien zu Maßen und Grenzen von
dimensions et limites des irrégularités de surface – Oberflächenbeschädigungen - Teil 11: EC-Kerne für den
Partie 11 : Noyaux EC utilisés dans des applications Einsatz in Netzteilen
d'alimentation électrique (IEC 63093-11:2018)
(IEC 63093-11:2018)
This European Standard was approved by CENELEC on 2018-07-26. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 63093-11:2018 E

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SIST EN IEC 63093-11:2019
EN IEC 63093-11:2018 (E)
European foreword
The text of document 51/1214/CDV, future edition 1 of IEC 63093-11, prepared by IEC/TC 51
"Magnetic components, ferrite and magnetic powder materials" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 63093-11:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-04-26
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-07-26
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 63093-11:2018 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
IEC 60424-3:2015 NOTE Harmonized as EN 60424-3:2016 (not modified)
IEC 62317-11 NOTE Harmonized as EN 62317-11

Withdrawn publication.
Withdrawn publication.

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SIST EN IEC 63093-11:2019
EN IEC 63093-11:2018 (E)
Annex ZA

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

Publication Year Title EN/HD Year
IEC 60205 -  Calculation of the effective parameters of EN 60205 -
magnetic piece parts
IEC 60401-1 -  Terms and nomenclature for cores made of EN 60401-1 -
magnetically soft ferrites -- Part 1: Terms
used for physical irregularities
IEC 60424-1 -  Ferrite cores - Guidelines on the limits of EN 60424-1 -
surface irregularities - Part 1: General


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SIST EN IEC 63093-11:2019

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SIST EN IEC 63093-11:2019

IEC 63093-11


Edition 1.0 2018-06



Ferrite cores – Guidelines on dimensions and the limits of surface

irregularities –

Part 11: EC-cores for use in power supply applications




ICS 29.100.10 ISBN 978-2-8322-5832-3

  Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission

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SIST EN IEC 63093-11:2019
– 2 – IEC 63093-11:2018 © IEC 2018
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Primary dimensions . 5
4.1 General . 5
4.2 Dimensions of EC-cores. 6
4.2.1 Principal dimensions . 6
4.2.2 Effective parameter and A values . 6
4.3 Dimensional limits for coil formers. 8
5 Limits of surface irregularities . 8
5.1 General . 8
5.2 Examples of surface irregularities . 8
5.3 Chips and ragged edges . 9
5.3.1 General. 9
5.3.2 Chips and ragged edges on the mating surfaces . 9
5.3.3 Chips and ragged edges on the other surfaces . 9
5.4 Cracks . 12
5.5 Flash . 12
5.6 Pull-outs . 12
5.7 Crystallites . 13
5.8 Pores . 13
Annex A (normative) Example of standard coil formers . 15
Annex B (informative) Reference of allowable areas of chips . 17
Bibliography . 18

Figure 1 – Dimensions of EC-cores . 6
Figure 2 – Main dimensions of coil formers for EC-cores. 8
Figure 3 – Examples of surface irregularities . 9
Figure 4 – Chip location for EC-cores . 10
Figure 5 – Crack and pull-out locations for EC-cores . 12
Figure 6 – Crystallite location for EC-cores . 13
Figure 7 – Pore location for EC-cores . 14
Figure A.1 – Main dimensions of coil formers for EC 35, EC 41, EC 52, EC 70 cores . 15
Figure A.2 – Main dimensions of coil formers for EC 90 core . 15

Table 1 – Dimensions of EC-cores . 7
Table 2 – Effective parameter and A values . 7
Table 3 – Dimensional limits for coil formers . 8
Table 4 – Area and length reference for visual inspection . 11
Table 5 – Limits for cracks . 13
Table A.1 – Main dimensions of coil formers (examples from Figures A.1 and A.2) for
EC-cores . 16
Table B.1 – Allowable areas of chips for EC-cores . 17

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SIST EN IEC 63093-11:2019
IEC 63093-11:2018 © IEC 2018 – 3 –


Part 11: EC-cores for use in power supply applications

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