IEC 60401-2:2009

IEC 60401-2 ®
Edition 2.0 2009-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Terms and nomenclature for cores made of magnetically soft ferrites –
Part 2: Reference of dimensions

Termes et nomenclature pour noyaux en matériaux ferrites magnétiquement
doux –
Partie 2: Références dimensionnelles

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IEC 60401-2 ®
Edition 2.0 2009-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Terms and nomenclature for cores made of magnetically soft ferrites –
Part 2: Reference of dimensions

Termes et nomenclature pour noyaux en matériaux ferrites magnétiquement
doux –
Partie 2: Références dimensionnelles

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
J
CODE PRIX
ICS 29.100.10 ISBN 978-2-88910-184-9
– 2 – 60401-2 © IEC:2009
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 General specifications .5
4 Dimension descriptions .5
5 Core illustrations .6

Figure 1 – Toroid core .6
Figure 2 – E core .6
Figure 3 – ETD or EER core .6
Figure 4 – EC core.6
Figure 5 – Planar E core .7
Figure 6 – Planar EL core .7
Figure 7 – Planar ER core.7
Figure 8 – Plate core mating planar cores.7
Figure 9 – EFD core .7
Figure 10 – Drum core .7
Figure 11 – EP core.8
Figure 12 – PQ core .8
Figure 13 – Pot core and half pot core for inductive proximity switches.8
Figure 14 – PM core .8
Figure 15 – RM core .8
Figure 16 – U core .8
Figure 17 – UR core .9
Figure 18 – Balun core.9
Figure 19 – Multi-hole bead .9

Table 1 – Toroid core dimension designations .5
Table 2 – Ferrite shapes dimension designations.6

60401-2 © IEC:2009 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TERMS AND NOMENCLATURE FOR CORES
MADE OF MAGNETICALLY SOFT FERRITES –

Part 2: Reference of dimensions

FOREWORD
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60401-2 has been prepared by IEC technical committee 51:
Magnetic components and ferrite materials.
This second edition cancels and replaces the first edition published in 2003. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
New ferrite core shapes “half pot core for inductive proximity switches and PM core” in
accordance with IEC 62317 series have been added respectively as Figure 13 and Figure 14
in Clause 5: core illustrations.

– 4 – 60401-2 © IEC:2009
The text of this standard is based on the following documents:
CDV Report on voting
51/943A/CDV 51/959/RVC
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60401 series, under the general title Terms and nomenclature for
cores made of magnetically soft ferrites, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60401-2 © IEC:2009 – 5 –
TERMS AND NOMENCLATURE FOR CORES
MADE OF MAGNETICALLY SOFT FERRITES –

Part 2: Reference of dimensions

1 Scope
This part of IEC 60401 presents a method for defining the designation nomenclature for the
major physical attributes of soft ferrite core shapes. The purpose of this standard is to
facilitate uniform usage of dimensional characters by manufacturers, specifiers, and users
when describing core dimensions on drawings, in tables, and on catalogue specification
sheets.
2 Normative references
The following referenced documents are indispensable for the application 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 62317 (all parts), Ferrite cores – Dimensions
3 General specifications
Only upper case alphabetic character assignments shall be used.
...