IEC TR 60297-3-1:2023

IEC TR 60297-3-1 ®
Edition 1.0 2023-02
TECHNICAL
REPORT
colour
inside
Mechanical structures for electrical and electronic equipment – Dimensions of
mechanical structures of the 482,6 mm (19 in) series
Part 3-1: Technological schemes and applications
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IEC TR 60297-3-1 ®
Edition 1.0 2023-02
TECHNICAL
REPORT
colour
inside
Mechanical structures for electrical and electronic equipment – Dimensions of

mechanical structures of the 482,6 mm (19 in) series

Part 3-1: Technological schemes and applications

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.240 ISBN 978-2-8322-6398-3

– 2 – IEC TR 60297-3-1:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Technological scheme of the IEC 60297 series . 10
4.1 Development history and technological background . 10
4.1.1 General . 10
4.1.2 Development of the 482,6 mm (19 in) subracks and associated plug-in
units (19-inch subrack system) . 10
4.1.3 Adoption of IEC 60603-2 connector in the 482,6 mm (19 in) subracks
and associated plug-in units ("19-inch subrack system") . 13
4.1.4 Modular structure of the 482,6 mm (19 in) series . 14
4.2 Extended specifications of the 486,2 mm (19 in) series . 16
4.2.1 General . 16
4.2.2 Extended specifications of 19-inch subrack system by the IEC 60917
series . 16
4.2.3 Enhanced 19-inch subrack system from the market applications . 18
5 Definition domains of the 482,6 mm (19 in) series standards . 18
6 Prospect for further applications and standards development of the 19-inch
subrack system . 20
Annex A (informative) Applicable connectors to the 482,6 mm (19 in) subracks and
associated plug-in units . 21
A.1 General conditions of the applicable connectors . 21
A.2 List of applicable connectors . 22
Annex B (informative) IEEE and VITA standards related with the 482,6 mm (19 in)
series . 25
B.1 Subracks and associated plug-in units . 25
B.2 Mezzanine card standards . 25
B.3 Conduction cooling . 28
B.4 Environmental specifications . 31
Bibliography . 33

Figure 1 – Unified printed board size accommodated with height and depth of the
subracks (recommended dimension matrix) . 12
Figure 2 – Typical image of 19-inch subrack system (6U subrack with plug-in units,
where the plug-in units are interconnected by a backplane fixed on the subrack frame) . 13
Figure 3 – Modular structure of the 482,6 mm (19 in) series. 15
Figure 4 – Basic dimensions of the modular structure of the 482,6 mm (19 in) series . 16
Figure 5 – Definition domains of the 482,6 mm (19 in) series standards . 20
Figure A.1 – Dimensional relations of the connectors within mating condition, in the
482,6 mm (19 in) subracks and associated plug-in units . 22
Figure B.1 – Examples of mezzanine card size (coordination dimensions as 25 mm
grid) and mezzanine card boundary envelope in IEEE 1301.4 . 26
Figure B.2 – Example of adoption of CMC single size on 6U depth 160 mm plug-in unit,
and outline of single size CMC (common mezzanine card) in IEEE 1386. 26
Figure B.3 – Outline of the CCA of 6U VME module in IEEE 1101.2 . 29

IEC TR 60297-3-1 © IEC 2023 – 3 –
Figure B.4 – Assembly of VPX-REDI 3U conduction cooled plug-in unit . 30
Figure B.5 – Assembly of VPX-REDI 3U conduction cooled chassis . 30

Table A.1 – Applicable connectors to the 482,6 mm (19 in) subracks and associated
plug-in units . 23
Table B.1 – IEEE and VITA standards for mezzanine cards applied on 19-inch subrack
system . 27
Table B.2 – Environmental class for the plug-in units in ANSI/VITA 47 . 31

– 4 – IEC TR 60297-3-1:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MECHANICAL STRUCTURES FOR ELECTRICAL AND
ELECTRONIC EQUIPMENT – DIMENSIONS OF MECHANICAL
STRUCTURES OF THE 482,6 mm (19 in) SERIES

Part 3-1: Technological schemes and applications

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
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC TR 60297-3-1 has been prepared by subcommittee 48D: Mechanical structures for
electrical and electronic equipment, of IEC technical committee 48: Electrical connectors and
mechanical structures for electrical and electronic equipment. It is a Technical Report.
The text of this Technical Report is based on the following documents:
Draft Report on voting
48D/756/DTR 48D/757/RVDTR
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Report is English.

IEC TR 60297-3-1 © IEC 2023 – 5 –
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60297 series, published under the general title Mechanical structures
for electrical and electronic equipment – Dimensions of mechanical structures of the 482,6 mm
(19 in) series, can be found on the IEC website.
Future documents in this series will carry the new general title as cited above. Titles of existing
documents in this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under 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.
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