EN 62317-12:2016

SLOVENSKI STANDARD
01-april-2017
)HULWQDMHGUD0HUHGHO2EURþDVWDMHGUD
Ferrite cores - Dimensions - Part 12: Ring cores
Ta slovenski standard je istoveten z: EN 62317-12:2016
ICS:
29.100.10 Magnetne komponente Magnetic components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62317-12

NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2016
ICS 29.100.10
English Version
Ferrite cores - Dimensions - Part 12: Ring cores
(IEC 62317-12:2016)
Noyaux de ferrite - Dimensions - Partie 12: Noyaux toriques Ferritkerne - Maße - Teil 12: Ringkerne
(IEC 62317-12:2016) (IEC 62317-12:2016)
This European Standard was approved by CENELEC on 2016-10-27. 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62317-12:2016 E
European foreword
The text of document 51/1128/CDV, future edition 1 of IEC 62317-12, prepared by
IEC/TC 51 "Magnetic components and ferrite materials" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN 62317-12:2016.

The following dates are fixed:
• latest date by which the document has to be (dop) 2017-07-27
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2019-10-27
• latest date by which the national
standards conflicting with the
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 [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62317-12:2016 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 indicated:

IEC 60401-2 NOTE Harmonized as EN 60401-2.
IEC 60424-4 NOTE Harmonized as EN 60424-4.
IEC 60317-1 NOTE Harmonized as EN 62317-1.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60205 -  Calculation of the effective parameters of EN 60205 -
magnetic piece parts
IEC 62317-12 ®
Edition 1.0 2016-09
INTERNATIONAL
STANDARD
Ferrite cores – Dimensions –
Part 12: Ring cores
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-3642-0

– 2 – IEC 62317-12:2016 © IEC 2016
CONTENTS
FOREWORD .3
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Abbreviated terms .5
5 Primary standards .5
5.1 General .5
5.2 Dimensions of ring-cores .5
5.2.1 Designation of dimensions .5
5.2.2 Identification of standard sizes .6
5.2.3 Effective parameter values .6
5.2.4 Dimensional limits for standard sizes .6
5.3 Coating . 14
Bibliography . 15

Table 1 – Ring core dimension designations .6
Table 2 – Standard ring cores .7
Table 3 – Effective parameters of ring cores .9
Table 4 – Uncoated ring cores recommended dimensional limits . 12

IEC 62317-12:2016 © IEC 2016 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – DIMENSIONS –
Part 12: Ring cores
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in
addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses
arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62317-12 has been prepared IEC technical committee 51: Magnetic
components, ferrite and magnetic powder materials.
This first edition cancels and replaces the first edition of IEC TR 61604 published in 1997. This
edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to IEC TR 61604:
a) amendment of Clause 5 concerning the relationship between standard of European,
Japanese and U.S.A. sizes;
b) addition of Subclause 5.3 concerning coating.

– 4 – IEC 62317-12:2016 © IEC 2016
The text of this standard is based on the following documents:
CDV Report on voting
51/1128/CDV 51/1143/RVC
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62317 series, under the general title Ferrite cores – Dimensions, can
be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IEC 62317-12:2016 © IEC 2016 – 5 –
FERRITE CORES – DIMENSIONS –
Part 12: Ring cores
1 Scope
This part of IEC 62317 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of ring-cores, also called toroid cores, and the effective
parameter values to be used in calculations involving them.
The selection of core sizes for this document is based on the philosophy of including those sizes
which are industrial standards, meaning that they are in broad-based use within industry. See
IEC 62317-1 for more detail concerning the philosophy of selecting core sizes to be included.
2 Normative references
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) applies.
IEC 60205, Calculation of the effective parameters of magnetic piece parts
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Abbreviated terms
ID    inside diameter
OD outside diameter
5 Primary standards
5.1 General
Compliance with the following requirements ensures mechanical interchangeability of complete
assemblies and wound coils.
5.2 Dimensions of ring-cores
5.2.1 Designation of dimensions
Table 1 describes the alphabetic character assignments for the dimensions of ferrite ring cores.

– 6 – IEC 62317-12:2016 © IEC 2016
Table 1 – Ring core dimension designations
Letter Dimension description
A Outside diameter
B Inside diameter
C Height
5.2.2 Identification of standard sizes
Table 2 shows the nominal dimensions for the range of standard ring cores. Table 2 also shows,
where applicable, the origin and regional name of each standard size, whether from historical
European sizes
...