SIST EN 60947-6-2:2003/A1:2007

SLOVENSKI STANDARD
SIST EN 60947-6-2:2003/A1:2007
01-september-2007
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Low-voltage switchgear and controlgear -- Part 6-2: Multiple function equipment - Control
and protective switching devices (or equipment) (CPS) (IEC 60947-6-2:2002/A1:2007)
Niederspannungsschaltgeräte -- Teil 6-2: Mehrfunktions-Schaltgeräte - Steuer- und
Schutz-Schaltgeräte (CPS) (CPS) (IEC 60947-6-2:2002/A1:2007)
Appareillage a basse tension -- Partie 6-2: Matériels a fonctions multiples - Appareils (ou
matériel) de connexion de commande et de protection (ACP) (IEC 60947-6-
2:2002/A1:2007)
Ta slovenski standard je istoveten z: EN 60947-6-2:2003/A1:2007
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60947-6-2:2003/A1:2007 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN 60947-6-2/A1

NORME EUROPÉENNE
March 2007
EUROPÄISCHE NORM

ICS 29.120.40; 29.130.20


English version


Low-voltage switchgear and controlgear -
Part 6-2: Multiple function equipment -
Control and protective switching devices (or equipment) (CPS)
(IEC 60947-6-2:2002/A1:2007)


Appareillage à basse tension -  Niederspannungsschaltgeräte -
Partie 6-2: Matériels à fonctions multiples - Teil 6-2: Mehrfunktions-Schaltgeräte -
Appareils (ou matériel) de connexion Steuer- und Schutz-Schaltgeräte (CPS)
de commande et de protection (ACP) (IEC 60947-6-2:2002/A1:2007)
(CEI 60947-6-2:2002/A1:2007)




This amendment A1 modifies the European Standard EN 60947-6-2:2003; it was approved by CENELEC on
2007-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment 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 Central Secretariat or to any CENELEC member.

This amendment 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
Central Secretariat has the same status as the official versions.

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. EN 60947-6-2:2003/A1:2007 E

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EN 60947-6-2:2003/A1:2007 - 2 -
Foreword
The text of document 17B/1526/FDIS, future amendment 1 to IEC 60947-6-2:2002, prepared by SC 17B,
Low-voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 60947-6-2:2003
on 2007-03-01.
The following dates were fixed:
– latest date by which the amendment has to be
implemented at national level by publication of
an identical national standard or by endorsement (dop) 2007-12-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2010-03-01
Annex ZA has been added by CENELEC
__________
Endorsement notice
The text of amendment 1:2007 to the International Standard IEC 60947-6-2:2002 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________

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- 3 - EN 60947-6-2:2003/A1:2007
Replace Annex ZA of EN 60947-6-2:2003 by the following:

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year
IEC 60034-1 2004 Rotating electrical machines - EN 60034-1 2004
Part 1: Rating and performance


IEC 60085 2004 Electrical insulation - Thermal classification EN 60085 2004


IEC 60410 1973 Sampling plans and procedures for inspection - -
by attributes


IEC 60695-2-10 2000 Fire hazard testing - EN 60695-2-10 2001
Part 2-10: Glowing/hot-wire based test
methods - Glow-wire apparatus and common
test procedure


IEC 60695-2-11 2000 Fire hazard testing - EN 60695-2-11 2001
Part 2-11: Glowing/hot-wire based test
methods - Glow-wire flammability test method
for end-products


IEC 60695-2-12 2000 Fire hazard testing - EN 60695-2-12 2001
Part 2-12: Glowing/hot-wire based test
methods - Glow-wire flammability test method
for materials


IEC 60695-2-13 2000 Fire hazard testing - EN 60695-2-13 2001
Part 2-13: Glowing/hot-wire based test
methods - Glow-wire ignitability test method
for materials


IEC 60695-11-10 1999 Fire hazard testing - EN 60695-11-10 1999
A1 2003 Part 11-10: Test flames - 50 W horizontal A1 2003
and vertical flame test methods


IEC 60947-1 2004 Low-voltage switchgear and controlgear - EN 60947-1 2004
Part 1: General rules + corr. November 2004


IEC 60947-2 2006 Low-voltage switchgear and controlgear - EN 60947-2 2006
Part 2: Circuit-breakers

---------------------- Page: 4 ----------------------

EN 60947-6-2:2003/A1:2007 - 4 -
Publication Year Title EN/HD Year
1)
IEC 60947-6-1 1989 Low-voltage switchgear and controlgear - EN 60947-6-1 1991
A1 1994 Part 6-1: Multiple function equipment - A1 1994

A2 1997 Automatic transfer switching equipment A2 1997


IEC 61000-4-2 1995 Electromagnetic compatibility (EMC) - EN 61000-4-2 1995
A1 1998 Part 4-2: Testing and measurement A1 1998
A2 2000 techniques - Electrostatic discharge A2 2001
immunity test


IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - EN 61000-4-3 2006
Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test


IEC 61000-4-4 2004 Electromagnetic compatibility (EMC) - EN 61000-4-4 2004
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test


2)
IEC 61000-4-5 1995 Electromagnetic compatibility (EMC) - EN 61000-4-5 1995

A1 2000 Part 4-5: Testing and measurement A1 2001
techniques - Surge immunity test


IEC 61000-4-6 2003 Electromagnetic compatibility (EMC) -
+ A1 2004 Part 4-6: Testing and measurement -
3)
+ A2 2006 techniques - Immunity to conducted EN 61000-4-6 200X
disturbances, induced by radio-frequency
fields


IEC 61131-2 2003 Programmable controllers - EN 61131-2 2003
Part 2: Equipment requirements and tests + corr. August 2003


CISPR 11 (mod) 2003 Industrial scientific and medical (ISM) radio-
+ A1 2004 frequency equipment - Electromagnetic EN 55011 2007
A2 2006 disturbance characteristics - Limits and A2 2007
methods of measurement





1)

EN 60947-6-1 is superseded by EN 60947-6-1:2005, which is based on IEC 60947-6-1:2005.
2)

EN 61000-4-5 is superseded by EN 61000-4-5:2006, which is based on IEC 61000-4-5:2005.
3)
To be ratified.

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NORME CEI
INTERNATIONALE
IEC



60947-6-2
INTERNATIONAL


2002
STANDARD


AMENDEMENT 1
AMENDMENT 1

2007-01

Amendement 1
Appareillage à basse tension –
Partie 6-2:
Matériels à fonctions multiples –
Appareils (ou matériel) de connexion
de commande de protection (ACP)

Amendment 1
Low-voltage switchgear and controlgear –
Part 6-2:
Multiple function equipment –
Control and protective switching devices
(or equipment) (CPS)
© IEC 2007 Droits de reproduction réservés ⎯ Copyright - all rights reserved
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
W
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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60947-6-2 Amend. 1 © IEC:2007 – 3 –
FOREWORD
This amendment has been prepared by subcommittee 17B: Low-voltage switchgear and
controlgear, of IEC technical committee 17: Switchgear and controlgear.
The text of this amendment is based on the following documents:
FDIS Report on voting
17B/1526/FDIS 17B/1535/RVD

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base 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.
_______________
Page 3
CONTENTS
Delete, on page 5, Subclauses 5.8 and 8.2.6: “Switching overvoltages”.
Delete, on page 7, Subclause 9.6: “Sampling plans and test procedure”.
Insert the following annexes:
Annex E (informative) Examples of control circuit configurations .
Annex F (normative) Coordination under short-circuit conditions between a CPS and another
short-circuit protective device associated in the same circuit .
Annex G (normative) Test sequence for CPSs for IT systems .
Annex H (normative) Extended functions within electronic overload relays or releases .

Insert the following figures:
Figure 26 – Thermal memory test .
Figure F.1 – Over-current coordination between a CPS and a fuse or back-up protection by a
fuse: operating characteristics .
Figure F.2 – Total discrimination between CPSs and circuit-breakers – Case 1 .
Figure F.3 – Total discrimination between CPSs and circuit-breakers – Case 2 .
Figure F.4 – Back-up protection by a CPS/circuit-breaker – Operating characteristics – Case 1

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60947-6-2 Amend. 1 © IEC:2007 – 5 –
Figure F.5 – Back-up protection by a CPS/circuit-breaker – Operating characteristics – Case 2
Figure F.6 – Example of test circuit for conditional short-circuit breaking capacity tests
showing cable connections for a 3-pole CPS (C ) .
1
Figure H.1 – Test circuit for the verification of the operating characteristic of a residual current
electronic overload relay.
Modify, on page 11, the title of Tables 3 and 4 as follows:
Table 3 – Trip classes of overload relays or releases for utilization categories AC-42, AC-43,
AC-44, DC-43, DC-45 .
Table 4 – Limits of operation of inverse time-delay overload relays or releases when
energized on two poles only.
Insert the following tables:
Table G.1 – Individual pole .
Table H.1 – Operating time of residual current electronic overload relays .
Page 19
1 Scope and object
Insert, after the second paragraph, the following new paragraph:
Digital inputs and/or digital outputs contained in CPSs, and intended to be compatible with
PLCs are covered by IEC 61131-2.
2 Normative references
Replace the reference to IEC 60034-1:1996 by the following:
IEC 60034-1:2004, Rotating electrical machines – Part 1: Rating and performance
Replace the reference to IEC 60085:1984 by the following:
IEC 60085:2004, Electrical insulation – Thermal classification
Replace the reference to IEC 60947-1:1999 by the following:
IEC 60947-1:2004, Low-voltage switchgear and controlgear – Part 1: General rules
Insert the following references:
IEC 60695-11-10:1999, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
Amendment 1 (2003)
IEC 60947-2:2006, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers

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60947-6-2 Amend. 1 © IEC:2007 – 7 –
Replace the reference to IEC 61000-4-3:1995 by the following:
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measure-
ment techniques – Radiated radio-frequency electromagnetic field immunity test
Replace the reference to IEC 61000-4-4:1995 by the following:
IEC 61000-4-4:2004, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measure-
ment techniques – Electrical fast transient/burst immunity test
Replace the reference to IEC 61000-4-6:1996 by the following:
IEC 61000-4-6:2003, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measure-
ment techniques – Immunity to conducted disturbances, induced by radio-frequency fields
Amendment 1 (2004)
Amendment 2 (2006)
Insert the following reference:
IEC 61131-2:2003, Programmable controllers – Part 2: Equipment requirements and tests
Replace the reference to CISPR 11:1997 by the following:
CISPR 11:2003, Industrial, scientific and medical (ISM) radio-frequency equipment –
Electromagnetic disturbance characteristics – Limits and methods of measurement
Amendment 1 (2004)
Amendment 2 (2006)
Page 21
3 Definitions
Under definition 3.1, insert, after the existing NOTE 1, the following new NOTE 2:
NOTE 2 For CPSs controlled with an electromagnet, such an electromagnet may be electronically controlled (see
3.1.1).
Renumber, on page 23, the existing NOTE 2, NOTE 3 and NOTE 4 as NOTE 3, NOTE 4 and
NOTE 5, respectively.
Insert, after definition 3.1, the following new definition 3.1.1:
3.1.1
electronically controlled coil for electromagnet
coil controlled by a circuit with active electronic elements

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60947-6-2 Amend. 1 © IEC:2007 – 13 –
5.7.2 Characteristic values
Replace the existing text of this subclause by the following:
Shunt, under-voltage (under-current), over-voltage (instantaneous over current), current or
voltage asymmetry and phase reversal opening relay or release:
− rated voltage (current);
− rated frequency;
− operating voltage (current);
− operating time (when applicable);
− inhibit time (when applicable).
Over-current relay or release:
− designation and current setting (or range of settings) (see 5.7.3);
− rated frequency, where necessary (e.g. in the case of a current transformer operated
overload relay);
− time-current characteristics (or range of characteristics), where necessary;
− trip class, where applicable according to classification in Table 3, or the value of the
maximum tripping time, in seconds, under the conditions specified in 8.2.1.5.1, Table 2,
column D, when this time exceeds 40 s;
− nature of the relay or release: thermal, magnetic, electronic or electronic without thermal
memory;
− nature of the reset: manual or automatic.
Relay or release with residual current sensing:
− rated current;
− operating current;
− operating time or time-current characteristic according to Table H.1;
− inhibit time (when applicable);
− type designation (see Annex H).
Page 37
5.8 Switching overvoltages
Delete this subclause completely.
Page 39
6.1.2 Characteristics
Modify the existing text of item d) as follows:
d) Rated operational voltages U (see 5.3.1 and, where applicable, Annex G).
e
Modify the existing text of item m) as follows:
m) Vacant.

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60947-6-2 Amend. 1 © IEC:2007 – 15 –
Modify the existing text of item r) as follows:
r) Current setting and identification of time-current characteristic of over current relays or
releases, specifying, according to 5.7, if the electronic overload relay does not contain
thermal memory.
Page 41
6.2 Marking
Add, at the end of this subclause, the following new paragraph:
If the manufacturer declares an electronic overload relay without thermal memory, this shall
be marked on the device.
6.3 Instructions for installation, operation and maintenance
Replace the existing text of this subclause by the following:
Subclause 5.3 of IEC 60947-1 applies with the following addition:
The manufacturer of a CPS incorporating an automatic reset overload relay capable of being
connected to enable automatic restarting shall provide, with the CPS, that information
necessary to alert the user to the possibility of automatic restarting.
8.1.1 Materials
Replace the existing text of this subclause by the following:
Subclause 7.1.1 of IEC 60947-1 applies with the following additions.
The manufacturer shall specify which test method is to be used.
When tests on the equipment or on sections taken from the equipment are used, parts of
insulating materials necessary to retain current-carrying parts in position shall conform to the
glow-wire tests of 8.2.1.1.1 of IEC 60947-1 at a test temperature of 960 °C.
Parts of insulating materials other than those specified in the previous paragraph shall
conform to the requirements of the glow-wire test of 8.2.1.1.1 of IEC 60947-1 at a temperature
of 650 °C.
When tests on materials are used, they shall be made according to the tests for flammability
category, hot wire ignition and, where applicable, arc ignition, as specified in 8.2.1.1.2 of
IEC 60947-1. The material used shall comply with the values given in Table M.1 of IEC 60947-1
according to the manufacturer’s chosen flammability category (see IEC 60695-11-10).
Page 43
8.1.6 Additional safety requirements for CPSs suitable for isolation
Delete the third paragraph, the three notes and the last paragraph of this subclause.

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60947-6-2 Amend. 1 © IEC:2007 – 17 –
Page 45
8.2.1.2 Limits of operation of power-operated CPSs
Replace the existing text of this subclause by the following:
8.2.1.2.1 CPSs controlled with an electromagnet
CPSs controlled with an electromagnet shall close satisfactorily at any value between 85 %
and 110 % of their rated control supply voltage U . Where a range is declared, 85 % shall
s
apply to the lower value and 110 % to the higher.
The limits between which CPSs shall drop out and open fully are 75 % to 20 % for a.c. and
75 % to 10 % for d.c. of their rated control supply voltage U . Where a range is declared,
s
20 % or 10 %, as the case may be, shall apply to the higher value and 75 % to the lower.
Limits for closing are applicable after the coils have reached a stable temperature
corresponding to indefinite application of 100 % U in an ambient temperature equivalent to
s
the ambient temperature declared by the manufacturer but not less than +40 °C.
Limits for drop-out are applicable with the coil circuit resistance at −5 °C. This can be verified
by calculation using values obtained at normal ambient air temperature.
The limits apply to d.c. and a.c. at declared frequency.
8.2.1.2.2 CPSs with electronically controlled electromagnet
Subclause 8.2.1.2.1 applies with the following modification.
Replace the second paragraph as follows:
The limits between which CPSs with an electronically controlled electromagnet shall drop out
and open fully are as follows:
− for d.c.: 75 % to 10 % of their rated control supply voltage U ,
s
− for a.c.: 75 % to 20 % of their rated control supply voltage U ,
s
− for a.c.: 75 % to 10 % of their rated control supply voltage U if specified by the
s
manufacturer,
− for a.c., where a range is declared with limits between 75 % to 10 % of their rated control
supply voltage U , the CPS shall, in addition, be submitted to the capacitive drop out test
s
of 8.2.1.2.4.
Where a range is declared, 20 % or 10 % as the case may be shall apply to the higher value
of the range and 75 % to the lower value of the range.

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60947-6-2 Amend. 1 © IEC:2007 – 19 –
8.2.1.2.3 CPSs operated electro-pneumatically
CPSs operated electro-pneumatically or pneumatically shall close satisfactorily with the air
supply pressure between 85 % and 110 % of the rated pressure and open between 75 % and
10 % of the rated pressure.
8.2.1.2.4 Capacitive drop out test
A capacitor C shall be inserted in series in the supply circuit U , the total length of the
s
connecting conductors being ≤ 3 m. The capacitor is short-circuited by a switch of negligible
impedance. The supply voltage shall then be adjusted to 110 % U .
s
It shall be verified that the CPS drops out when the switch is operated to the open position.
The value of the capacitor shall be as follows:
C (nF) = 30 + 200 000 / (f × U max)
s
e.g. for a coil rated 12…24 V – 50 Hz, the capacitor value is 196 nF (calculation made with U
s
max., see note 1).
NOTE 1 The test voltage is the highest value of the declared rated supply voltage range U .
s
2
NOTE 2 The value of the capacitor is calculated in order to simulate a 100 m long cable of 1,5 mm connected to
a static output having a 1,3 mA leakage current.
NOTE 3 The drop out time should be specified for particular uses, e.g. emergency breaking.
8.2.1.5 Limits of operation of over-current relays or releases
Replace the existing title and text of this subclause, including Tables 2, 3 and 4, by the
following:
8.2.1.5 Limits of operation of current sensing relays and releases
8.2.1.5.1 Opening under overload conditions
8.2.1.5.1.1 General tripping requirements of inverse time-delay overload relays or
releases (type c) in 5.7.1.3.1)
i) Utilization categories AC-42, AC-43, AC-44, DC-43, DC-45
NOTE 1 The thermal protection of motors in the presence of harmonics in the supply voltage is under
consideration.
When all poles are energized
The relays or releases are classified for these utilization categories according to Table 3
and shall comply with the requirements of Tables 2 and 3 when tested as follows:
– With the CPS in its enclosure, if normally fitted, and at A times the current setting,
tripping shall not occur in less than 2 h starting from the cold state, at the value of
reference ambient air temperature stated in Table 2. However, when the overload relay
terminals have reached thermal equilibrium at the test current in less than 2 h, the test
duration can be the time to reach such thermal equilibrium.
– When the current is subsequently raised to B times the current setting, tripping shall
occur in less than 2 h.

---------------------- Page: 13 ----------------------

60947-6-2 Amend. 1 © IEC:2007 – 21 –
– For trip classes 2, 3, 5 and 10A overload relays or releases energized at C times the
current setting, tripping shall occur in less than 2 min, starting from thermal equilibrium
at 1,0 times the current setting, in accordance with 9.3.3 of IEC 60034-1.
NOTE 2 Subclause 9.3.3 of IEC 60034-1 states: “Polyphase motors having rated outputs not exceeding
315 kW and rated voltages not exceeding 1 kV shall be capable of withstanding a current equal to 1,5
times the rated current for not less than 2 min.”
– For trip classes 10, 20, 30 and 40 overload relays or releases energized at C times the
current setting, tripping shall occur in less than 4 min, 8 min, 12 min or 16 min
respectively, starting from thermal equilibrium at 1,0 times the current setting.
– At D times the current setting, tripping time T shall occur within the limits given in
p
Table 3 for the appropriate trip class and tolerance band starting from the cold state.
– In the case of overload relays or releases having a current setting range, the limits of
operation shall apply both when the relay or release is carrying the current associated
with the maximum setting and when the relay or release is carrying the current
associated with the minimum setting.
– For non-compensated overload relays or releases the current multiple/ambient
temperature characteristic shall be not greater than 1,2 %/K.
NOTE 3 1,2 %/K is the derating characteristic of PVC insulated cables.
An overload relay or release is regarded as compensated if it complies with the
relevant requirements of Table 2 at 20 °C and is within the limits shown in Figure 1 at
other temperatures.
Table 2 – Limits of operation of inverse time-delay overload relays or releases when
energized on all poles
Multiples of
Utilization
Ambient air
current setting
Type of relay or release
category
temperature values
A B C D
Thermal type not compensated for –5 °C, +20 °C and
1,0 1,2 1,5 7,2
AC-42 ambient air temperature variations +40 °C
AC-43
1,05 1,3 1,5 –5 °C
−
Thermal type compensated for
AC-44
1,05 1,2 1,5 7,2 +20 °C
ambient air temperature variations
DC-43
1,0 1,2 1,5 +40 °C
−
DC-45
–5 °C, +20 °C and
1,05 1,2 1,5 7,2
Electronic type
+40 °C
AC-40
AC-41
AC-45a
AC-45b All types 1,05 1,3 − − +30 °C
DC-40
DC-41
DC-46

---------------------- Page: 14 ----------------------

60947-6-2 Amend. 1 © IEC:2007 – 23 –
Table 3 – Trip classes of overload relays or releases for utilization categories AC-42,
AC-43, AC-44, DC-43, DC-45
Trip class Tripping time T under the conditions Tripping time T under the conditions
p p
specified in 8.2.1.5.1.1, specified in 8.2.1.5.1.1,
a
Table 2, column D Table 2, column D for tighter
a
tolerances (tolerance band E)
s s
2 −   T ≤ 2
p
2 < T ≤ 3
3 p
−
3 < T ≤ 5
p
5
0,5 < T ≤ 5
p
−
2 < T ≤ 10
10A
p
5 < T ≤ 10
p
4 < T ≤ 10
p
10
10 < T ≤ 20
p
6 < T ≤ 20
p
20
20 < T ≤ 30
9 < T ≤ 30 p
p
30
30 < T ≤ 40
p
−
40
a
The manufacturer shall add the letter E to trip classes to indicate compliance with the band E.

When two poles are energized
With reference to Table 4, with the relay or release energized on three poles, at A times
the current setting, tripping shall not occur in less than 2 h, starting from the cold state, at
the value of the ambient air temperature stated in Table 4.
Moreover, when the value of the current flowing in two poles (in phase-loss sensitive
relays those carrying the higher current) is subsequently increased to B times the current
setting, and the third pole de-energized, tripping shall occur in less than 2 h.
The values shall apply to all combinations of poles.
In the case of relays or releases having an adjustable current setting, the characteristics
shall apply both when the relay or release is carrying the current associated with the
maximum setting, and when the relay is carrying the current associated with the minimum
setting.
Table 4 – Limits of operation of three-pole inverse time-delay overload relays or
releases when energized on two poles only
Multiples of current setting
Reference ambient air
Type of overload relay or release
temperature
A B
Thermal, compensated for ambient 3 poles 2 poles
air temperature variations or 1,0 1,32
electronic
+20 °C
Not phase-loss sensitive 1 pole
0
Thermal, not compensated for 3 poles 2 poles
ambient air temperature variations 1,0 1,25
+40 °C
Not phase-loss sensitive 1 pole
0
Thermal, compensated for ambient 2 poles 2 poles
air temperature variations or 1,0 1,15
electronic
+20 °C
Phase-loss sensitive 1 pole 1 pole
0,9 0

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60947-6-2 Amend. 1 © IEC:2007 – 25 –
ii) Utilization categories AC-40, AC-41, AC-45a, AC-45b; DC-40, DC-41, DC-46
Conventional values for inverse time-delay overload relays or releases operation are given
in Table 2.
At the reference temperature of 30 °C ± 2 °C and at 1,05 times the current setting, i.e. with
the conventional non-tripping current (see 2.5.30 of IEC 60947-1), the opening release
being energized on all poles, tripping shall not occur in less than the conventional time 2 h
(1 h when I < 63 A) from the cold state i.e. with the CPS at the reference temperature.
e
Moreover, when at the end of the conventional time the value of current is immediately
raised to 1,30 times the current setting, i.e. with the conventional tripping current (see
2.5.31 of IEC 60947-1), tripping shall occur in less than the conventional time above.
NOTE 4 The ref
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