CLC/TR 50473:2007

SLOVENSKI STANDARD
01-september-2007
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Recommendations for dimensional co-ordination between enclosures and built-in
devices for rail fixing for household and similar installations
Recommandations pour la coordination dimensionnelle des enveloppes et des dispositifs
incorporés a fixation sur rail pour usages domestiques et analogues
Ta slovenski standard je istoveten z: CLC/TR 50473:2007
ICS:
29.060.10 Žice Wires
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL REPORT
CLC/TR 50473
RAPPORT TECHNIQUE
May 2007
TECHNISCHER BERICHT
ICS 29.060.10 Supersedes R023-001:1995

English version
Recommendations for dimensional co-ordination
between enclosures and built-in devices
for rail fixing for household and similar installations

This Technical Report was approved by CENELEC on 2006-01-21.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 50473:2007 E
Foreword
Report R023-001:1995 was prepared by the Technical Committee CENELEC TC 23E, Circuit breakers
and similar devices for household and similar applications. It has been drawn up on the basis of the
th th th
decisions taken by TC 23E at their 9 meeting on 8 and 9 November 1994, where the document
CLC/TC23E(Sec)38 and the relevant comments of the National Committees were examined.
This Report was approved by CENELEC on 1995-03-06.
Following BT decision D124/C048 and TC 23E advice, an updated version of R023-001:1995 was
circulated for voting for conversion into a Technical Report in accordance with the Internal Regulations,
Part 2, Subclause 11.4.3.3 and was approved by CENELEC as CLC/TR 50473 on 2006-01-21.
This Technical Report supersedes R023-001:1995.

- 3 - CLC/TR 50473:2007
1 Scope
The purpose of this report is to give recommendations of the co-ordination of dimensions between
enclosures and built-in devices for rail fixing for household or similar installations by listing the principal
overall and related mounting dimensions, the rated current of a single device not exceeding 125 A.
Examples of these devices are: MCBs, RCDs switches, fuse-systems, indicating lamps, relays, socket-
outlets, timing switches, etc.
Compliance with this document does not preclude the need for compliance with other relevant
specifications.
This document needs not apply to type tested and partially type tested assemblies which are covered by
other specifications. The means of fixing envisaged in this document are mounting rails. Other possible
means of fixing may be used but are not covered by these recommendations.
NOTE The only criterion chosen in this document for co-ordination of dimensions has been the geometry of the devices. When
selecting the enclosure, other criteria should be taken into account, e.g. the rated current of the devices.
2 Normative references
EN 60715:2001, Dimensions of low-voltage switchgear and controlgear - Standardized mounting on rails
for mechanical support of electrical devices in switchgear and controlgear installations (IEC 60715:1981 +
A1:1995)
3 Definitions
For the purpose of this Technical Report the following definitions apply:
3.1
module (m)
a basic single block
3.2
device
a modular block that is not intended to be split into independent units
4 Mounting rails
The mounting rails used shall be of the 35 mm “Top hat” type according to EN 60715 or an equivalent
mounting means, obtained e.g. by moulding or pressing.
NOTE Other types of mounting rails may be used but are not necessarily covered by these recommendations.
Recommendations for dimensional co-ordination of devices designed to be fixed on two mounting rails
are under consideration. Examples are given in Annex A.
5 Dimensions of devices relevant to mounting
The principal dimensions necessary to co-ordinate the built-in devices with the enclosures are given in
Figure 1.
5.1 Width “l”
The width of a device shall be
+0,5
l = n × (m ) mm
where
n = 0,5 or 1 or 1,5 or 2 or 2,5 or 3 or 3,5 or 4 …
m = 12,5 or 17,5 mm
NOTE The preferred value for future designs is m = 17,5 mm.
5.2 Height of a given device “h”
h and h of a given device (see Figure 1a)) need not to be equal.
1 2
h or h , whichever is the greater, shall be chosen from the series 45 – 55 – 75 – 100 – 125 mm.
1max 2max
NOTE 1  The maximum height (h + h ) must not exceed twice the values chosen.
1 2
NOTE 2  The means for fixing or removing the device to and from the rail are not taken into account.
5.3 Height of front projection “d” (see Figure 1a))
Up to and including a value h or h – whichever is the greater – of 45 mm the height d of the front
1 2
projections shall be 45 ± 0,5 mm.
For values of h or h greater than 45 mm the front projection “d” shall have one of the following values:
1 2
45 mm and 80 mm, with a tolerance of ± 0,5 mm.
NOTE The preferred value for future designs is d = 45 mm.
5.4 Depth dimensions q , q and q (see Figure 1a))
1 2 3
The depth dimensions are given in Table 1.
Table 1 – Depth dimensions
b
q q q
1max 2min 3max
mm mm mm
a c
44 50
92,5
55 57 70
92,5
64 66 80
76 84 100
a
Preferred value.
b
Where more than one value of q is shown for a value of q and q ; the appropriate value is a function of the design
3max 1max 2min
“family” of the device.
c
Preferred value of q = 52 mm.
2min
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