SIST EN 60947-4-1:2002/A2:2006
(Main)Low-voltage switchgear and controlgear -- Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
Low-voltage switchgear and controlgear -- Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
This standard consists of various amendments among those are requirements for electronic overload relais, additional functions for thermal overload relais, a new table with a comparison bettween rated operational power and current of motors.
Niederspannungsschaltgeräte -- Teil 4-1: Schütze und Motorstarter - Elektromechanische Schütze und Motorstarter
Appareillage à basse tension -- Partie 4-1: Contacteurs et démarreurs de moteurs - Contacteurs et démarreurs électromécaniques
Nizkonapetostne stikalne naprave - 4-1. del: Kontaktorji in motorski zaganjalniki - Elektromehanski kontaktorji in motorski zaganjalniki (IEC 60947-4- 1:2000/A2:2005)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60947-4-1:2002/A2:2006
01-januar-2006
Nizkonapetostne stikalne naprave - 4-1. del: Kontaktorji in motorski zaganjalniki -
Elektromehanski kontaktorji in motorski zaganjalniki (IEC 60947-4- 1:2000/A2:2005)
Low-voltage switchgear and controlgear -- Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-starters
Niederspannungsschaltgeräte -- Teil 4-1: Schütze und Motorstarter -
Elektromechanische Schütze und Motorstarter
Appareillage à basse tension -- Partie 4-1: Contacteurs et démarreurs de moteurs -
Contacteurs et démarreurs électromécaniques
Ta slovenski standard je istoveten z: EN 60947-4-1:2001/A2:2005
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60947-4-1:2002/A2:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 60947-4-1:2002/A2:2006
---------------------- Page: 2 ----------------------
SIST EN 60947-4-1:2002/A2:2006
EUROPEAN STANDARD EN 60947-4-1/A2
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2005
ICS 29.130.20; 29.120.99
English version
Low-voltage switchgear and controlgear
Part 4-1: Contactors and motor-starters –
Electromechanical contactors and motor-starters
(IEC 60947-4-1:2000/A2:2005)
Appareillage à basse tension Niederspannungsschaltgeräte
Partie 4-1: Contacteurs et démarreurs Teil 4-1: Schütze und Motorstarter -
de moteurs – Elektromechanische Schütze und
Contacteurs et démarreurs Motorstarter
électromécaniques (IEC 60947-4-1:2000/A2:2005)
(CEI 60947-4-1:2000/A2:2005)
This amendment A2 modifies the European Standard EN 60947-4-1:2001; it was approved by CENELEC
on 2005-07-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and 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
© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60947-4-1:2001/A2:2005 E
---------------------- Page: 3 ----------------------
SIST EN 60947-4-1:2002/A2:2006
EN 60947-4-1:2001/A2:2005 - 2 -
Foreword
The text of document 17B/1412/FDIS, future amendment 2 to IEC 60947-4-1:2000, 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 A2 to
EN 60947-4-1:2001 on 2005-07-01.
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) 2006-04-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2008-07-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of amendment 2:2005 to the International Standard IEC 60947-4-1:2000 was approved by
CENELEC as an amendment to the European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60664-1 NOTE Harmonized as EN 60664-1:2003 (not modified).
__________
---------------------- Page: 4 ----------------------
SIST EN 60947-4-1:2002/A2:2006
- 3 - EN 60947-4-1:2001/A2:2005
Replace Annex ZA of EN 60947-4-1:2001/A1:2002 by :
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 Where 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 60034-11 2004 Part 11: Thermal protection EN 60034-11 2004
IEC 60050-441 1984 International Electrotechnical Vocabulary - -
(IEV)
Chapter 441: Switchgear, controlgear and
fuses
A1 2000 - -
IEC 60076-1 1993 Power transformers EN 60076-1 1997
(mod) Part 1: General A11 1997
A1 1999 A1 2000
A12 2002
IEC 60085 2004 Electrical insulation - Thermal EN 60085 2004
classification
IEC 60112 2003 Method for the determination of the proof EN 60112 2003
and the comparative tracking indices of
solid insulating materials
IEC 60255-8 1990 Electrical relays EN 60255-8 1998
(mod) Part 8: Thermal electrical relays
IEC 60269-1 1998 Low-voltage fuses EN 60269-1 1998
Part 1: General requirements
IEC 60269-2 1986 Part 2: Supplementary requirements for EN 60269-2 1995
fuses for use by authorized persons
(fuses mainly for industrial application)
A1 1995 A1 1998
A2 2001 A2 2002
IEC 60269-2-1 2004 Part 2-1: Supplementary requirements for HD 60269-2-1 2005
(mod) fuses for use by authorized persons
(fuses mainly for industrial application) --
Sections I to VI: Examples of types of
standardized fuses
---------------------- Page: 5 ----------------------
SIST EN 60947-4-1:2002/A2:2006
EN 60947-4-1:2001/A2:2005 - 4 -
Publication Year Title EN/HD Year
IEC 60410 1973 Sampling plans and procedures for - -
inspection by attributes
IEC 60947-1 2004 Low-voltage switchgear and controlgear EN 60947-1 2004
Part 1: General rules + corr. November 2004
IEC 60947-2 2003 Part 2: Circuit-breakers EN 60947-2 2003
IEC 60947-3 1999 Part 3: Switches, disconnectors, switch- EN 60947-3 1999
disconnectors and fuse-combination units
A1 2001 A1 2001
IEC 60947-5-1 2003 Part 5-1: Control circuit devices and EN 60947-5-1 2004
switching elements - Electromechanical + corr. July 2005
control circuit devices
IEC 61000-4-2 1995 Electromagnetic compatibility (EMC) EN 61000-4-2 1995
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
A1 1998 A1 1998
A2 2000 A2 2001
IEC 61000-4-3 2002 Part 4-3: Testing and measurement EN 61000-4-3 2002
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
A1 2002 A1 2002
1)
IEC 61000-4-4 1995 Part 4-4: Testing and measurement EN 61000-4-4 1995
techniques - Electrical fast transient/burst
immunity test
A1 2000 A1 2001
A2 2001 A2 2001
IEC 61000-4-5 1995 Part 4-5: Testing and measurement EN 61000-4-5 1995
techniques - Surge immunity test
A1 2000 A1 2001
IEC 61095 1992 Electromechanical contactors for EN 61095 1993
household and similar purposes
A1 2000 A1 2000
+ A1/corr. April 2001
IEC 61810-1 2003 Electromechanical elementary relays EN 61810-1 2004
Part 1: General and safety requirements
CISPR 11 2003 Industrial scientific and medical (ISM) - -
radio-frequency equipment -
Electromagnetic disturbance
characteristics - Limits and methods of
measurement
1)
EN 61000-4-4 is superseded by EN 61000-4-4:2005, which is based on IEC 61000-4-4:2004.
---------------------- Page: 6 ----------------------
SIST EN 60947-4-1:2002/A2:2006
NORME CEI
INTERNATIONALE
IEC
60947-4-1
INTERNATIONAL
2000
STANDARD
AMENDEMENT 2
AMENDMENT 2
2005-06
Amendement 2
Appareillage à basse tension –
Partie 4-1:
Contacteurs et démarreurs de moteurs –
Contacteurs et démarreurs électromécaniques
Amendment 2
Low-voltage switchgear and controlgear –
Part 4-1:
Contactors and motor-starters –
Electromechanical contactors and
motor-starters
IEC 2005 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
V
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 7 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 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/1412/FDIS 17B/1421/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.
_____________
Change, throughout the standard, “solid state” by “electronic”.
Page 3 and amendment 1, page 3
CONTENTS
Modify the title of Clause 3 to read:
3 Terms, definitions, symbols and abbreviations
Insert the following:
3.4 Symbols and abbreviations
Replace “5.9 Switching overvoltages” by “5.9 Vacant”.
---------------------- Page: 8 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 5 –
Add, on page 5, the title of the new Annexes G, H and I:
Annex G (informative) Rated operational currents and rated operational powers of switching
devices for electrical machines
Annex H (normative) Extended functions within electronic overload relays
Annex I (informative) AC1 contactors for use with semiconductor controlled motor loads
Add, on page 5, the title of new Figures 8 and H.1:
Figure 8 – Thermal memory test
Figure H.1 – Test circuit for the verification of the operating characteristic of a residual current
electronic overload relay
Modify, on page 5, the title of Table 2 to read:
Table 2 – Trip classes of overload relays
Modify, on page 5, the title of Table 4 to read:
Table 4 − Limits of operation of three-pole time-delay overload relays when energized on two
poles only
Add, on page 7, the title of new Tables G.1 and H.1
Table G.1 – Rated operational power and currents
Table H.1 – Operating time of residual current electronic overload relays
Page 9
FOREWORD
Replace, on page 11, the two last paragraphs, by the following:
Annexes A, B, F and H form an integral part of this standard.
Annexes D, E, G and I are for information only.
---------------------- Page: 9 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 7 –
Page 19 and amendment 1, page 5
2 Normative references
Replace the existing text of the first paragraph by the following:
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.
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 60034-11:1978 by the following:
IEC 60034-11:2004, Rotating electrical machines – Part 11: Thermal protection
Add, after IEC 60050(441), the following reference:
Amendment 1 (2000)
Replace the reference to IEC 60085:1984 by the following:
IEC 60085:2004, Electrical insulation – Thermal classification
Replace the reference to IEC 60112:1979 by the following:
IEC 60112:2003, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
Replace the reference to IEC 60269-2-1:1998 by the following:
IEC 60269-2-1:2004, Low-voltage fuses – Part 2-1: Supplementary requirements for fuses for
use by authorized persons (fuses mainly for industrial application) – Sections I to VI:
Examples of types of standardized fuses
Replace the reference to IEC 60947-1:1999 by the following:
IEC 60947-1:2004, Low-voltage switchgear and controlgear – Part 1: General rules
Replace the reference to IEC 60947-2:1995 by the following:
IEC 60947-2:2003, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
---------------------- Page: 10 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 9 –
Replace the reference to IEC 60947-5-1:1997 by the following:
IEC 60947-5-1:2003, Low-voltage switchgear and controlgear – Part 5-1: Control circuit
devices and switching elements – Electromechanical control circuit devices
Replace the reference to IEC 61000-4-3:1995 by the following:
IEC 61000-4-3:2002, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measure-
ment techniques – Radiated radio-frequency electromagnetic field immunity test
Amendment 1 (2002)
Replace the reference to IEC 61810-1:1998 by the following:
IEC 61810-1:2003, Electromechanical elementary relays – Part 1: General and safety
requirements
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)
Page 21
3 Definitions
Replace the existing title by the following:
3 Terms, definitions, symbols and abbreviations
Insert, after the first paragraph, the following alphabetical index of definitions:
Reference
A
Auto-transformer starter. 3.2.5.2
C
Close transition (with an auto-transformer starter or star-delta starter). 3.2.23
Combination starter . 3.2.8
Combination switching device . 3.2.27
Contactor (mechanical). 3.1.1
D
Direct-on-line starter . 3.2.2
E
Electromagnetic contactor. 3.1.2
Electromagnetic starter . 3.2.10
Electronic overload relay with current or voltage asymmetry function. H.2.2
Electronic overload relay with phase reversal function . H.2.3
Electronic overload relay with residual current (earth fault) function. H.2.1
Electronically controlled coil for electromagnet . 3.1.8
Electro-pneumatic contactor. 3.1.4
Electro-pneumatic starter. 3.2.13
---------------------- Page: 11 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 11 –
Inching (jogging) . 3.2.24
Inhibit current . H.2.5
Inhibit time. 3.2.30
J
Jam sensitive electronic overload relay. 3.2.29
L
Latched contactor. 3.1.5
M
Manual starter. 3.2.9
Mirror contact . F.2.1
Motor-operated starter . 3.2.11
N
n-step starter . 3.2.16
O
Open transition (with an auto-transformer starter or star-delta starter) . 3.2.22
Over-voltage sensitive electronic overload relay . H.2.4
P
Phase loss sensitive thermal overload relay or release . 3.2.17
Plugging. 3.2.25
Pneumatic contactor . 3.1.3
Pneumatic starter . 3.2.12
Position of rest (of a contactor) . 3.1.7
Protected starter. 3.2.7
Protected switching device. 3.2.26
R
Reduced voltage starter. 3.2.5
Reversing starter . 3.2.3
Rheostatic rotor starter . 3.2.6.2
Rheostatic starter. 3.2.6
Rheostatic stator starter. 3.2.6.1
S
Single-step starter . 3.2.14
Stall sensitive electronic overload relay . 3.2.28
Star-delta starter. 3.2.5.1
Starter. 3.2.1
Starting time (of a rheostatic starter). 3.2.20
Starting time (of an auto-transformer starter) . 3.2.21
T
Two-direction starter . 3.2.4
Two-step starter. 3.2.15
U
Under-current relay or release . 3.2.18
Under-voltage relay or release. 3.2.19
V
Vacuum contactor (or starter) . 3.1.6
---------------------- Page: 12 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 13 –
Page 23
3.2 Definitions concerning starters
Replace, on page 27, the existing definitions 3.2.7 and 3.2.8 by the following:
3.2.7
protected starter
equipment consisting of a starter, a manually-operated switching device and a short-circuit
protective device, rated as a unit by the manufacturer
NOTE 1 The protected starter may or may not be enclosed.
NOTE 2 In the context of this standard, the term “manufacturer“ means any person, company or organization with
ultimate responsibility as follows:
− to verify compliance with the appropriate standard;
− to provide the product information according to Clause 6.
NOTE 3 The manually operated switching device and the short-circuit protective device may be just one device
and may also incorporate the starter overload protection.
3.2.8
combination starter (see Figure 3)
equipment consisting of a protected starter, as defined in 3.2.7, incorporating an isolating
function
Replace, on page 29, the existing definition 3.2.18 by the following:
3.2.18
under-current relay or release
measuring relay or release which operates automatically when the current through it is
reduced below a predetermined value
Add to the definition 3.2.19 the following note:
NOTE The starting time of a starter is shorter than the total starting time of the motor which also takes into
account the last period of acceleration following the switching operation to the ON position.
Replace, on definition 3.2.20, the existing note by the following:
NOTE The starting time of a starter is shorter than the total starting time of the motor which also takes into
account the last period of acceleration following the switching operation to the ON position.
Renumber definitions 3.2.19 to 3.2.24 as 3.2.20 to 3.2.25.
Insert, on page 29, after definition 3.2.18, the following new definition 3.2.19:
3.2.19
under-voltage relay or release
measuring relay or release which operates automatically when the voltage applied to it is
reduced below a predetermined value
---------------------- Page: 13 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 15 –
Add, on page 29, after definition 3.2.25, the following new definitions 3.2.26 to 3.2.30:
3.2.26
protected switching device
equipment (for non motor loads) consisting of a contactor or a semiconductor controller,
overload protection, a manually operated switching device and a short-circuit protective
device, rated as a unit by the manufacturer
NOTE 1 The protected switching device may or may not be enclosed.
NOTE 2 In the context of this standard, the term “manufacturer” means any person, company or organization with
ultimate responsibility as follows:
− to verify compliance with the appropriate standard;
− to provide the product information according to Clause 6.
NOTE 3 The manually operated switching device and the short-circuit protective device may be just one device
and may incorporate the overload protection as well.
3.2.27
combination switching device
equipment consisting of a protected switching device, as defined in 3.2.26, incorporating an
isolating function
3.2.28
stall sensitive electronic overload relay
electronic overload relay which operates when the current has not decreased below a
predetermined value for a specific period of time during start-up or when the relay receives
the input indicating there is no rotation of the motor after a predetermined time in accordance
with specified requirements
NOTE Explanation of stall: rotor locked during start.
3.2.29
jam sensitive electronic overload relay
electronic overload relay which operates in the case of overload and also when the current
has increased above a predetermined value for a specific period of time during operation, in
accordance with specified requirements
NOTE Explanation of jam: high overload occurring after the completion of starting which causes the current to
reach the locked rotor current value of the motor being controlled.
3.2.30
inhibit time
time-delay period during which the tripping function of the relay is inhibited (may be
adjustable)
Page 31
Add, after definition 3.3.1, the following new subclause:
3.4 Symbols and abbreviations
AQL Acceptable quality level
EMC Electromagnetic compatibility
I Current made and broken (Table 7)
c
I Rated operational current (5.3.2.5)
e
I Rated rotor operational current (5.3.2.7)
er
---------------------- Page: 14 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 17 –
I Rated stator operational current (5.3.2.6)
es
I Inhibit current (H.2.5)
ic
I Conventional free air thermal current (5.3.2.1)
th
I Conventional enclosed thermal current (5.3.2.2)
the
I Conventional rotor thermal current (5.3.2.4)
thr
I Conventional stator thermal current (5.3.2.3)
ths
I Rated uninterrupted current (5.3.2.8)
u
SCPD Short-circuit protective device
T Tripping time (Table 2)
p
U Rated control circuit voltage (5.5)
c
U Rated operational voltage (5.3.1.1)
e
U Rated rotor operational voltage (5.3.1.1.2)
er
U Rated stator operational voltage (5.3.1.1.1)
es
U Rated insulation voltage (5.3.1.2)
i
U Rated impulse withstand voltage (5.3.1.3)
imp
U Rated rotor insulation voltage (5.3.1.2.2)
ir
U Rated stator insulation voltage (5.3.1.2.1)
is
U Power frequency or d.c. recovery voltage (Table 7)
r
U Rated control supply voltage (5.5)
s
5.1 Summary of characteristics
Delete the eighth dashed item: “− switching overvoltages (5.9);”
Page 37
5.3.2.5 Rated operational currents (I ) or rated operational powers
e
Insert, after the second paragraph, the following note:
NOTE Annex G gives values concerning the relationship between rated operational currents and rated operational
powers.
Page 45
5.3.5.5.1 Starting characteristics of rheostatic rotor starters
Replace, for t , “(see 3.2.19)” by “(see 3.2.20)”.
s
Page 47
5.3.5.5.3 Starting characteristics for two-step auto-transformer starters
Replace, in the first sentence, “(see 3.2.20)” by “(see 3.2.21)”.
---------------------- Page: 15 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 19 –
Page 53
5.7.2 Types of relay or release
Replace under item c), items 2) and 3) by the following new items 2) and 3):
2) dependent on previous load (e.g. thermal or electronic overload relay);
3) dependent on previous load (e.g. thermal or electronic overload relay) and also
sensitive to phase loss (see 3.2.17).
Replace items d) and e) by the following new items d) and e):
d) Instantaneous over-current relay or release (e.g. jam sensitive, see 3.2.29).
e) Other relays or releases (e.g. control relay associated with devices for the thermal
protection of the motor).
Delete the existing note.
Add, after item e), the following new item f):
f) Stall relay or release.
5.7.3 Characteristic values
Replace the existing item a) by the following new item a):
a) Release with shunt coil, 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).
Replace, in item b), fourth dashed item, “30 s” by “40 s”.
Modify, in item b), the text of the sixth dashed item to read:
“nature of the relay: thermal, magnetic, electronic or electronic without thermal memory.”
Add, after item b), the following new item c):
c) Release with residual current sensing relay:
− 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: 16 ----------------------
SIST EN 60947-4-1:2002/A2:2006
60947-4-1 Amend. 2 IEC:2005 – 21 –
Page 55
Table 2 – Trip classes of thermal, time-delay magnetic or electronic overload relays
Replace the existing table, including the title, by the following:
Table 2 – Trip classes of overload relays
Trip class Tripping time T under the conditions Tripping time T under the conditions
p p
specified in 8.2.1.5.1, specified in 8.2.1.5.1,
a
Table 3, column D for tighter
Table 3, column D
a
tolerances (tolerance band E)
s s
2 T ≤ 2
−
p
3 2 < T ≤ 3
−
p
5 3 < T ≤ 5
0,5 < T ≤ 5
p
p
10A −
2 < T ≤ 10
p
10 5 < T ≤ 10
4 < T ≤ 10
p
p
20
6 < T ≤ 20 10 < T ≤ 20
p
p
30
9 < T ≤ 30 20 < T ≤ 30
p p
40
30 < T ≤ 40
−
p
a
The manufacturer shall add the letter E to trip classes to indicate compliance with the band E.
NOTE 1 Depending on the nature of the relay, the tripping conditions are given in 8.2.1.5.
NOTE 2 In the case of a rheostatic rotor starter, the overload relay is
...
SLOVENSKI SIST EN 60947-4-
1:2002/OprA2:2004
PREDSTANDARD
junij 2004
Low-voltage switchgear and controlgear -- Part 4-1: Contactors and motor-starters -
Electromechanical contactors and motor-starters
ICS 29.130.20 Referenčna številka
SIST EN 60947-4-
1:2002/OprA2:2004(en)
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17B/1347/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJET DE COMITÉ POUR VOTE (CDV)
Project number IEC 60947-4-1, A2, Ed.2.0
Numéro de projet
IEC/TC or SC: Date of circulation Closing date for voting (Voting
SC 17B
Date de diffusion mandatory for P-members)
CEI/CE ou SC:
Date de clôture du vote (Vote
2004-04-23
obligatoire pour les membres (P))
2004-09-24
Titre du CE/SC: Appareillage à basse tension TC/SC Title: Low-voltage switchgear and
controlgear
Secretary: Mr. Marcel DELAPLACE (France)
Secrétaire: E-mail: marcel_delaplace@mail.schneider.fr
Also of interest to the following committees Supersedes documents
Intéresse également les comités suivants Remplace les documents
17B/1299/CD and 17B/1323A/CC
Functions concerned
Fonctions concernées
Safety EMC Environment Quality assurance
Sécurité CEM Environnement Assurance qualité
CE DOCUMENT EST TOUJOURS À L'ÉTUDE ET SUSCEPTIBLE DE THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT
MODIFICATION. IL NE PEUT SERVIR DE RÉFÉRENCE. SHOULD NOT BE USED FOR REFERENCE PURPOSES.
LES RÉCIPIENDAIRES DU PRÉSENT DOCUMENT SONT INVITÉS À RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR
PRÉSENTER, AVEC LEURS OBSERVATIONS, LA NOTIFICATION DES COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF
DROITS DE PROPRIÉTÉ DONT ILS AURAIENT ÉVENTUELLEMENT WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING
CONNAISSANCE ET À FOURNIR UNE DOCUMENTATION EXPLICATIVE. DOCUMENTATION.
Titre : Title :
Amendement 2 à la CEI 60947-4-1, Ed. 2: Amendment 2 to IEC 60947-4-1, Ed. 2: Low-
Appareillage à basse tension – Partie 4-1: voltage switchgear and controlgear – Part 4-1:
Contacteurs et démarreurs de moteurs – Contactors and motor-starters –
Contacteurs et démarreurs électromécaniques Electromechanical contactors and motor-starters
Note d'introduction Introductory note
ATTENTION ATTENTION
CDV soumis en parallèle au vote (CEI) Parallel IEC CDV/CENELEC Enquiry
et à l’enquête (CENELEC)
Copyright © 2004 International Electrotechnical Commission, IEC. All rights reserved. It is
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
printed version of the document, or any part of it, for any other purpose without permission in
writing from IEC.
FORM CDV (IEC)
2002-08-09
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60947-4-1 Amend. 2/CDV IEC:200X – 2 –
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/XXXX/FDIS 17B/XXXX/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 the base publication and its amendments will
remain unchanged until 2008. At this date, the publication will be:
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
_______________
Change, in the whole standard, “solid state” by “electronic”
Page 3 and amendment 1, page 3
CONTENTS
Modify the title of clause 3 to read:
3 Definitions, symbols and abbreviations
Insert the following:
3.4 Symbols and abbreviations
Replace “5.9 Switching overvoltages” by “5.9 Vacant”.
Add, on page 5, the title of the new annexes G, H and J:
Annex G (informative) Rated operational currents and rated operational powers of switching
devices for electrical machines
Annex H (normative) Extended functions within electronic overload relays
Annex J (informative) Contactors for use with semiconductor controlled loads
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60947-4-1 Amend. 2/CDV IEC:200X – 3 –
Add, on page 5, the title of new figures 8 and H.1:
Figure 8 – Thermal memory test
Figure H.1 – Test circuit for the verification of the operating characteristic of a residual current
electronic overload relay
Modify, on page 5, the title of table 2 to read:
Table 2 – Trip classes of overload relays
Modify, on page 5, the title of table 4 to read:
Table 4 − Limits of operation of three-pole time-delay overload relays when energized on two
poles only
Add, on page 7, the title of new tables G.1 and H.1
Table G.1 – Rated operational power and currents
Table H.1 – Operating time of residual current electronic overload relays
Page 9
FOREWORD
Replace, on page 11, the two last paragraphs, by the following:
Annexes A, B, F and H form an integral part of this standard.
Annexes D, E, G and J are for information only.
Page 19 and amendment 1, page 5
2 Normative references
Replace the existing text of first paragraph by the following:
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.
Add, after IEC 60050(441), the following reference:
Amendment 1 (2000)
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60947-4-1 Amend. 2/CDV IEC:200X – 4 –
Replace the reference to IEC 60112:1979 by the following
IEC 60112:2003, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
Replace the reference to IEC 60947-1:1999 by the following:
IEC 60947-1:2004, Low-voltage switchgear and controlgear – Part 1: General rules
Replace the reference to IEC 60947-2:1995 by the following:
IEC 60947-2:2003, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers
Replace the reference to IEC 60947-5-1:1997 by the following:
IEC 60947-5-1:2003, Low-voltage switchgear and controlgear – Part 5-1: Control circuit
devices and switching elements – Electromechanical control circuit devices
Replace the reference to IEC 61000-4-3:1995 by the following:
IEC 61000-4-3:2002, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated radio-frequency electromagnetic field immunity test
Amendment 1 (2002)
Replace the reference to IEC 61810-1:1998 by the following:
IEC 61810-1:2003, Electromechanical elementary relays – Part 1: General and safety
requirements
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
Page 21
3 Definitions
Replace the existing title by the following:
3 Definitions, symbols and abbreviations
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60947-4-1 Amend. 2/CDV IEC:200X – 5 –
Insert, after the first paragraph, the following alphabetical index of definitions:
Reference
A
Auto-transformer starter. 3.2.5.2
C
Close transition (with an auto-transformer starter or star-delta starter). 3.2.23
Combination starter . 3.2.8
Combination protected switching device . 3.2.27
Contactor (mechanical). 3.1.1
D
Direct-on-line starter . 3.2.2
E
Electromagnetic contactor. 3.1.2
Electromagnetic starter . 3.2.10
Electronic overload relay with current or voltage asymmetry function. H.2.2
Electronic overload relay with phase reversal function . H.2.3
Electronic overload relay with residual current (earth fault) function. H.2.1
Electronically controlled coil for electromagnet . 3.1.8
Electro-pneumatic contactor . 3.1.4
Electro-pneumatic starter. 3.2.13
I
Inching (jogging) . 3.2.24
Inhibit current . H.2.5
Inhibit time. 3.2.30
J
Jam sensitive electronic overload relay. 3.2.29
L
Latched contactor . 3.1.5
M
Manual starter. 3.2.9
Mirror contact . F.2.1
Motor-operated starter . 3.2.11
N
n-step starter . 3.2.16
O
Open transition (with an auto-transformer starter or star-delta starter) . 3.2.22
Over-voltage sensitive electronic overload relay . H.2.4
P
Phase loss sensitive thermal overload relay or release . 3.2.17
Plugging. 3.2.25
Pneumatic contactor . 3.1.3
Pneumatic starter . 3.2.12
Position of rest (of a contactor) . 3.1.7
Protected starter . 3.2.7
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60947-4-1 Amend. 2/CDV IEC:200X – 6 –
Protected switching device . 3.2.26
R
Reduced voltage starter. 3.2.5
Reversing starter . 3.2.3
Rheostatic rotor starter . 3.2.6.2
Rheostatic starter . 3.2.6
Rheostatic stator starter. 3.2.6.1
S
Single-step starter . 3.2.14
Stall sensitive electronic overload relay . 3.2.28
Star-delta starter. 3.2.5.1
Starter. 3.2.1
Starting time (of a rheostatic starter). 3.2.20
Starting time (of an auto-transformer starter) . 3.2.21
T
Two-direction starter. 3.2.4
Two-step starter. 3.2.15
U
Under-current relay or release . 3.2.18
Under-voltage relay or release. 3.2.19
V
Vacuum contactor (or starter) . 3.1.6
Page 23
3.2 Definitions concerning starters
Replace, on page 27, the existing definitions 3.2.7 and 3.2.8 by the following:
3.2.7
protected starter
equipment consisting of a starter, a manually-operated switching device and a short-circuit
protective device, rated as a unit by the manufacturer
NOTE 1 The protected starter may also include an isolating function.
NOTE 2 In the context of this standard, the term “manufacturer“ means any person, company or organisation with
ultimate responsibility as follows:
− to verify compliance with the appropriate standard;
− to provide the product information according to Clause 6.
NOTE 3 The manually operated switching device and the short-circuit protective device may be just one device
and may also incorporate the starter overload protection.
3.2.8
combination starter (see Figure 3)
equipment consisting of a protected starter, as defined in 3.2.7, mounted and wired in a
dedicated enclosure
NOTE A dedicated enclosure is a specifically designed and dimensioned enclosure in which all tests are
conducted.
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60947-4-1 Amend. 2/CDV IEC:200X – 7 –
Replace, on page 29, the existing definition 3.2.18 by the following:
3.2.18
under-current relay or release
measuring relay or release which operates automatically when the current through it is
reduced below a predetermined value
Add to the definition 3.2.19 the following note:
NOTE The starting time of a starter is shorter than the total starting time of the motor which also takes into
account the last period of acceleration following the switching operation in the ON position.
Replace, on definition 3.2.20, the existing note by the following:
NOTE The starting time of a starter is shorter than the total starting time of the motor which also takes into
account the last period of acceleration following the switching operation in the ON position.
Renumber definitions 3.2.19 to 3.2.24 as 3.2.20 to 3.2.25
Insert, on page 29, after definition 3.2.18, the following new definition 3.2.19:
3.2.19
under-voltage relay or release
measuring relay or release which operates automatically when the voltage applied to it is
reduced below a predetermined value
Add, on page 29, after definition 3.2.25, the following new definitions 3.2.26 to 3.2.30:
3.2.26
protected switching device
equipment (for non motor loads) consisting of a contactor or a semiconductor controller,
overload protection, a manually operated switching device and a short-circuit protective
device, rated as a unit by the manufacturer
NOTE 1 The protected switching device may also include an isolating function.
NOTE 2 In the context of this standard, the term “manufacturer” means any person, company or organisation with
ultimate responsibility as follows:
- to verify compliance with the appropriate standard;
- to provide the product information according to Clause 6.
NOTE 3 The manually operated switching device and the short-circuit protective device may be just one device
and may incorporate the overload protection as well.
3.2.27
combination protected switching device
equipment consisting of a protected switching device, as defined in 3.2.26, mounted and
wired in a dedicated enclosure
NOTE A dedicated enclosure is a specifically designed and dimensioned enclosure in which all tests are
conducted.
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60947-4-1 Amend. 2/CDV IEC:200X – 8 –
3.2.28
stall sensitive electronic overload relay
electronic overload relay which operates when the current has not decreased below a
predetermined value for a specific period of time during start-up or when the relay receives
the input indicating there is no rotation of the motor after a predetermined time in accordance
with specified requirements
NOTE Explanation of stall: motor locked during start.
3.2.29
jam sensitive electronic overload relay
electronic overload relay which operates in the case of overload and also when the current
has increased above a predetermined value for a specific period of time during run in
accordance with specified requirements
NOTE Explanation of jam: high overload occurring after the completion of starting which causes the current to
reach the locked rotor current value of the motor being controlled.
3.2.30
inhibit time
time-delay period during which the tripping function of the relay is inhibited (may be
adjustable)
Page 31
Add, after definition 3.3.1, the following new subclause:
3.4 Symbols and abbreviations
EMC Electromagnetic compatibility
I Current made and broken
c
I Rated operational current
e
I Rated rotor operational current
er
I Rated stator operational current
es
I Inhibit current
ic
I Conventional free air thermal current
th
I Conventional enclosed thermal current
the
I Conventional rotor thermal current
thr
I Conventional stator thermal current
ths
I Rated uninterrupted current
u
SCPD Short-circuit protective device
T
p Tripping time
U Rated control circuit voltage
c
U Rated operational voltage
e
U Rated rotor operational voltage
er
U Rated stator operational voltage
es
U Rated insulation voltage
i
U Rated impulse withstand voltage
imp
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60947-4-1 Amend. 2/CDV IEC:200X – 9 –
U Rated rotor insulation voltage
ir
U Rated stator insulation voltage
is
U Power frequency or d.c. recovery voltage
r
U Rated control supply voltage
s
5.1 Summary of characteristics
Delete the eighth dashed item: “− switching overvoltages (5.9);”
Page 37
5.3.2.5 Rated operational currents (I ) or rated operational powers
e
Insert, after the second paragraph, the following note:
NOTE Annex G gives values concerning the relationship between rated operational currents and rated
operational powers.
Page 45
5.3.5.5.1 Starting characteristics of rheostatic rotor starters
Replace, for t , “(see 3.2.19)” by “(see 3.2.20)”.
s
Page 47
5.3.5.5.3 Starting characteristics for two-step auto-transformer starters
Replace, in the first sentence, “(see 3.2.20)” by “(see 3.2.21)”.
Page 53
5.7.2 Types of relay or release
Replace items c) 2) and c) 3) by the following new items c) 2) and c) 3):
2) dependent on previous load (e.g. thermal or electronic overload relay);
3) dependent on previous load (e.g. thermal or electronic overload relay) and also
sensitive to phase loss (see 3.2.17).
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60947-4-1 Amend. 2/CDV IEC:200X – 10 –
Replace items d) and e) by the following new items d) and e):
d) Instantaneous over-current relay or release (e.g. jam sensitive, see 3.2.29).
e) Other relays or releases (e.g. control relay associated with devices for the thermal
protection of the starter).
Delete the existing note.
Add, after item e), the following new item f):
f) Stall relay or release.
5.7.3 Characteristic values
Replace the existing item a) by the following new item a):
a) Release with shunt coil, 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).
Replace, in item b), fourth dashed item, “30 s” by “40 s”.
Add, after item b), the following new item c):
c) Release with residual current sensing relay:
− 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 55
Table 2 – Trip classes of thermal, time-delay magnetic or electronic overload relays
Replace the existing table, including the title, by the following:
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60947-4-1 Amend. 2/CDV IEC:200X – 11 –
Table 2 – Trip classes of overload relays
Trip class Tripping time T under the conditions Tripping time T under the conditions
p p
specified in 8.2.1.5.1, specified in 8.2.1.5.1,
a
Table 3, column D for tighter
Table 3, column D
a
tolerances (tolerance band E)
s s
2 T ≤ 2
−
p
3 2 < T ≤ 3
−
p
5 3 < T ≤ 5
0,5 < T ≤ 5
p
p
10A −
2 < T ≤ 10
p
10 5 < T ≤ 10
4 < T ≤ 10
p
p
20 10 < T ≤ 20
6 < T ≤ 20
p
p
30 20 < T ≤ 30
9 < T ≤ 30
p
p
40
30 < T ≤ 40
−
p
a
The manufacturer shall add the letter E to trip classes to indicate compliance with the band E.
NOTE 1 Depending on the nature of the relay, the tripping conditions are given in 8.2.1.5.
NOTE 2 In the case of a rheostatic rotor starter, the overload relay is commonly inserted in the stator circuit. As
a result, it cannot efficiently protect the rotor circuit and more particularly the resistors (generally more easily
damageable than the rotor itself or the switching devices in case of a faulty start); protection of the rotor circuit
should be the subject of a specific agreement between manufacturer and user (see, inter alia, 8.2.1.1.3).
NOTE 3 In the case of a two-step auto-transformer starter, the starting auto-transformer is normally designed for
use during the starting period only: as a result, it cannot be efficiently protected by the overload relay in the event
of faulty starting. Protection of the auto-transformer should be the subject of specific agreement between
manufacturer and user (see 8.2.1.1.4).
NOTE 4 The lower limiting values of T are selected to allow for differing heater characteristics and
p
manufacturing tolerances.
Page 57
5.9 Switching overvoltages
Replace the existing title and text by the following:
5.9 Vacant
Page 61
6.1.2 Characteristics, basic rated values and utilization
Modify the text of item m), second paragraph, to read:
“rated conditional short-circuit current (see 5.3.6) of the combination starter, the combination
protected switching device, the protected starter or the protected switching device and type of
co-ordination (see 8.2.5.1).”
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60947-4-1 Amend. 2/CDV IEC:200X – 12 –
Delete the item n).
Page 65
8.1 Constructional requirements
Delete the note.
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 at a test temperature of 850 °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 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).
8.1.2 Current-carrying parts and their connections
Delete the text between brackets.
8.2.1.5 Limits of operation of current operated relays and releases
Replace the existing title of this subclause by the following:
8.2.1.5 Limits of operation of current sensing relays and releases
Page 71 and amendment 1, page 15
8.2.1.5.1 Limits of operation of time-delay overload relays when all poles are energized
Insert, before the first paragraph, the following title and note:
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60947-4-1 Amend. 2/CDV IEC:200X – 13 –
8.2.1.5.1.1 Common requirements
NOTE 1 The thermal protection of motors submitted to harmonics is under consideration.
Replace the existing item c) by the following:
c) for class 2, 3, 5 and 10A overload relays energized at C times the current setting, tripping
shall occur in less than 2 min starting from thermal equilibrium, at the current setting, in
accordance with 8.2.3 of IEC 60034-1;
NOTE 2 Subclause 8.2.3 of IEC 60034-1 states: “Three-phase a.c. motors having rated outputs not exceeding
315 kW and rated voltages not exceeding 1 kV shall be capable of withstanding currents equal to 1,5 times the
rated current for not less than 2 min.”.
Replace the existing item e) by the following:
e) at D times the current setting, tripping shall occur within the limits given in Table 2 for the
appropriate trip class and tolerance band, starting from the cold state.
Renumber the last note of this subclause as “NOTE 3”.
Replace, in the last paragraph, “figure 7” by “Table 3”.
Table 3 – Limits of operation of time-delay overload relays when energized on all poles
Replace the existing table by the following new table:
Multiples of current setting
Type of overload relay Ambient air temperature values
A B C D
Thermal type not compensated for
1,0 1,2 1,5 7,2 -5 °C, +20 °C and +40 °C
ambient air temperature variations
Thermal type compensated for
1,05 1,3 1,5 − -5 °C
ambient air temperature variations
1,05 1,2 1,5 7,2 +20 °C
1,0 1,2 1,5 − +40 °C
Electronic type 1,05 1,2 1,5 7,2 -5 °C, +20 °C and +40 °C
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60947-4-1 Amend. 2/CDV IEC:200X – 14 –
Add the following new subclause:
8.2.1.5.1.2 Thermal memory test verification
Electronic overload relays shall fulfil the following requirements (see Figure 8):
- apply a current equal to I for two hours ±10 %;
e
- interrupt the current for 30 s ±10 %;
- apply a current equal to 7,2 x I ;
e
- the relay shall trip within 50% of the time T measured at D current according to Table 3.
p
Page 73
8.2.1.5.2 Limits of operation of three-pole thermal overload relays energized on two
poles
Replace the existing title of this subclause by the following:
8.2.1.5.2 Limits of operation of three-pole time-delay overload relays energized on two
poles
Replace the existing text of the last paragraph by the following:
In the case of overload relays having an adjustable current setting, the characteristics shall
apply both when the relay 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 thermal overload relays when energized on
two poles only
Replace the existing table, including the title, by the following:
---------------------- Page: 15 ----------------------
60947-4-1 Amend. 2/CDV IEC:200X – 15 –
Table 4 – Limits of operation of three-pole time-delay overload relays
when energized on two poles only
Multiples of current setting
Reference ambient air
Type of overload relay
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
8.2.1.5.4 Limits of operation of automatic change over by under-current relays
Replace the existing title and text of this subclause by the following:
8.2.1.5.4 Limits of operation of under-current relays and releases for automatic change
over
8.2.1.5.4.1 Limits of operation of under-current relays
An under-current relay or release, when associated with a switching device, shall operate to
open the switching device within 90 % to 110 % of the set time when the current during run is
below 0,9 times the under-current setting in all poles.
8.2.1.5.4.2 Limits of operation of automatic change over by under-current relays
− for star-delta starters from star to delta, and
− for auto-transformer starters from the starting to the ON position
The lowest drop-out current of an under-current relay shall be not greater than 1,5 times the
actual current setting of the overload relay which is active in the starting or
...
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