IEC 60947-4-1:2009/AMD1:2012

Amendment 1 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters

Amendement 1 - Appareillage à basse tension - Partie 4-1: Contacteurs et démarreurs de moteurs - Contacteurs et démarreurs électromécaniques

General Information

• Status: Published
• Publication Date: 19-Jul-2012
• ICS: 29.060.10 - Wires
• ICS: 29.120.99 - Other electrical accessories
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 25-Oct-2018

Relations

• Amends: IEC 60947-4-1:2009 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• Effective Date: 05-Sep-2023
• Revised: IEC 60947-4-1:2018 - Low-voltage switchgear and controlgear - Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60947-4-1


®


Edition 3.0 2012-07



INTERNATIONAL



STANDARD



NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1

Low-voltage switchgear and controlgear –
Part 4-1: Contactors and motor-starters – Electromechanical contactors and
motor-starters

Appareillage à basse tension –
Partie 4-1: Contacteurs et démarreurs de moteurs – Contacteurs et démarreurs
électromécaniques


IEC 60947-4-1:2009/A1:2012

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60947-4-1



®



Edition 3.0 2012-07







INTERNATIONAL





STANDARD







NORME



INTERNATIONALE




AMENDMENT 1

AMENDEMENT 1





Low-voltage switchgear and controlgear –

Part 4-1: Contactors and motor-starters – Electromechanical contactors and

motor-starters




Appareillage à basse tension –

Partie 4-1: Contacteurs et démarreurs de moteurs – Contacteurs et démarreurs


électromécaniques













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX S


ICS 29.120.99; 29.130.20 ISBN 978-2-83220-142-8



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
– 2 – 60947-4-1 Amend.1 © IEC:2012



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/1769/FDIS 17B/1780/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 stability 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.
_____________

INTRODUCTION
This amendment includes the following significant technical changes with respect to the
previous edition 3 (2009):
• introduction of the motor management starter;
• definitions and measurement method of the power consumption of the control circuit
during holding and pick-up operations;
• measurement method of the pole impedance;
• requirements for screwless terminals;
• performance requirements for latched contactors;

• alignments to Amendment 1 of IEC 60947-1:2007;
• harmonisation with IEC 60947-2 of the operation tests of under-voltage relays and shunt
releases;
• short-circuit tests harmonisation with North America;
• test requirements for utilisation AC-6b capacitor load;
• polarity for DC contactors;
• dielectric test method in presence of built-in varistor;
• addition of an extended function for electronic overload relay: control functions.

---------------------- Page: 4 ----------------------
60947-4-1 Amend.1 © IEC:2012 – 3 –


1.1.2 AC motor-starters


Add, in the first paragraph, the parenthesis "(including motor management starter)" between

"AC motor-starters" and "intended to start".





1.1.2.2.1 Star-delta starters


Replace, in the first sentence of the existing note, "the current" by "the starting current".



1.1.2.3 Rheostatic rotor starters
Delete the existing second paragraph and the existing note.

2 Normative references
Add to the existing list the following normative reference:
IEC 61051-2:1991, Varistors for use in electronic equipment – Part 2: Sectional specification
for surge suppression varistors

3.2 Alphabetical index of terms
Delete from the existing list the following terms and references:
electronic overload relay with current imbalance detection.H.2.2
electronic overload relay with ground/earth fault function .H.2.1
electronic overload relay with phase reversal function.H.2.4
electronic overload relay with under power detection .H.2.6
inhibit current (I ) .H.2.7
ic

Add to the existing list the following new terms and references:

holding power . 3.3.9
motor management starter . 3.4.31
pick-up power . 3.3.10

---------------------- Page: 5 ----------------------
– 4 – 60947-4-1 Amend.1 © IEC:2012


3.3.8
electronically energized coil of electromagnet


Replace the existing term and definition by the following new term and new definition:

3.3.8.

electronically controlled electromagnet

electromagnet in which the coil is controlled by a circuit with active electronic elements





Add, after the existing definition 3.3.8, the following new terms and definitions 3.3.9 and

3.3.10:
3.3.9
holding power (of a contactor)
power needed to maintain the operation of the electromagnet
3.3.10
pick-up power (of a contactor)
power needed to operate the contactor from the de-energized state to the energized state

Add, after the existing definition 3.4.30, the following new term and definition 3.4.31:
3.4.31
motor management starter
starter including extended functions with communication ability
NOTE Interoperable device profiles for motor management starter are defined by IEC 61915-2.

3.6 Symbols and abbreviations
Add to the existing list the following new symbols:
P Nominal holding power of a d.c. controlled contactor
c
P Pick-up power of a d.c. controlled contactor with separate pick-up and hold-on windings
p
S Holding power of an a.c. controlled contactor
h
S Pick-up power of an a.c. controlled contactor
p

U Voltage drop of a contactor pole
d
Z Pole impedance of a contactor (5.3.7)
"r" Minimum short-circuit test current
I Maximum conditional short-circuit test current
q

Delete from the existing list "I Inhibit current (H.2.7)".
ic

---------------------- Page: 6 ----------------------
60947-4-1 Amend.1 © IEC:2012 – 5 –


5.3.1.1.2 Rated rotor operational voltage (U )
er

Add, after the second paragraph, the following new paragraph and new note:


The rated insulation voltage of the switching devices inserted in the rotor circuit shall be at

least 50 % the highest voltage between open slip-rings.


NOTE Electrical stresses are lower and shorter in the rotor than in the stator.





5.3.5.5.2 Standard conditions for making and breaking corresponding to the
starting characteristics for rheostatic rotor starters
Delete the existing note.

Add, after the existing Subclause 5.3.6, the following new Subclause 5.3.7:
5.3.7 Pole impedance of a contactor (Z)
The pole impedance may be stated by the manufacturer and is determined by measuring the
voltage drop resulting of the current flowing through the pole.

5.5 Control circuits
Replace the entire existing text by the following new text:
Subclause 4.5 of IEC 60947-1:2007 applies.

5.7.3 Characteristic values
Replace the existing item c) by 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 T.1 of
IEC 60947-1:2007, Amendment 1;
– inhibit time (when applicable);
– type designation (see Annex T of IEC 60947-1: 2007, Amendment 1).

6.1.2 Characteristics, basic rated values and utilization
Add, after the exiting item d), the following new item aa):
aa) polarity of terminals, if applicable;

---------------------- Page: 7 ----------------------
– 6 – 60947-4-1 Amend.1 © IEC:2012


Add, after the existing item h), the following Note 1:


NOTE 1 Other information such as the pole impedance could be given e.g. in the product literature.





Replace the existing Note 1 of item o) by the following new Note 2:


NOTE 2 Other information such as the holding or pick-up power could be given e.g. in the product literature.




Renumber the existing Note 2 and Note 3 as Note 3 and Note 4 respectively.

6.2 Marking
Replace, in the existing third paragraph, "items c) in 6.1.1, k), and s2) in 6.1.2" by " items c)
in 6.1.1, aa), k), and s2) in 6.1.2".
Replace, at the end of the existing fourth paragraph, "and Annex E" by "and Annex U of
IEC 60947-1:2007, Amendment 1".

8.2.1.2 Limits of operation of contactors and power-operated starters
Replace the existing Subclauses 8.2.1.2.1 to 8.2.1.2.4 by the following new text:
Subclause 7.2.1.2 of IEC 60947-1:2007 applies with following additions:
For latched contactors, the device shall drop out and open fully when a de-latching voltage
between 85 % and 110 % of the rated de-latching voltage is applied.

Table 3 – Limits of operation of time-delay overload relays when energized on all poles
c
Delete the existing table footnote and its reference in the table.


d c
Renumber the existing table footnote and its four references in the table as .

e d
Renumber the existing table footnote and its two references in the table as .

a
Replace the text of the existing table footnote by the following new text:
This test shall only be done at 20 °C for A, B and D multiples of current setting.

a
Delete, in column D, the existing reference to the table footnote .

a
Add a new reference to the table footnote at the end of "Electronic type".

---------------------- Page: 8 ----------------------
60947-4-1 Amend.1 © IEC:2012 – 7 –


8.2.2.7.1 Uninterrupted and eight-hour duty windings


Replace, in the first paragraph, "7.2.2.2" by "7.2.2.6".





8.2.3 Dielectric properties


Replace the entire existing text by the following new text:


Subclause 7.2.3 of IEC 60947-1:2007 applies with the following additions:

General requirements for device including voltage limiting components inserted between
circuits not connected to the ground/earth to be tested according to the dielectric test are
described as follows.
These voltage limiting components called varistors used in order to protect electronic parts
from surges within the device shall comply with IEC 61051-2. In this clause, the intent is not
to reduce the clearances. For the type test of the device the voltage limiting components may
be disconnected.
IEC 61051-2 applies as follows:
a) Preferred climatic categories of the varistor:
• maximum lower temperature: -10 °C
• minimum upper temperature: +85 °C
The device manufacturer has to verify that the varistor is suitable for use in the extended
ambient temperature if any.
b) The minimum rated voltage of the varistor shall be 1,2 times the maximum peak voltage
where the varistor is connected.
c) When connected to the mains, varistors shall withstand the surge test according to
9.4.2.5.
NOTE 1 With the verification of the varistors above it is assumed that a fuse protecting the varistor is not
necessary.
NOTE 2 The possibility given in 8.3.3.4.1 item 1) of IEC 60947-1:2007 of disconnecting circuits between poles
may be not appropriate in the routine test, because the products are completed and it is not appropriate to reopen
and manipulate them. The main purpose of this test is to identify the proper operation of the voltage limiting
component.

---------------------- Page: 9 ----------------------
– 8 – 60947-4-1 Amend.1 © IEC:2012


Table 7 – Making and breaking capacities – Making and breaking
conditions according to utilization category


Replace the existing Table 7 by the following new table:

Make and break conditions

b


On-time Off-time Number of
Utilization category
I / I U / U Cos φ operating
c e r e
s s
cycles

f
AC-1 1,5 0,8 0,05 50
1,05

h h f
AC-2 4,0 0,65 0,05 50
1,05

i a f

AC-3 8,0 0,05 50
1,05
i a f
AC-4 10,0 0,05 50
1,05
f
AC-5a 3,0 0,45 0,05 50
1,05
c
c
60
AC-5b 0,05 50
1,5 1,05
j
AC-6a
e l m
AC-6b 1,5 1,05  50
k
a
AC-8a 6,0 1,05 0,05 f 50
k a
AC-8b 6,0 1,05 0,05 f 50
b

On-time Off-time Number of
L / R
Utilization category I / I U / U operating
c e r e
s s
ms
cycles
f d
DC-1 1,5 1,05 1,0 0,05 50
f d
50
DC-3 4,0 1,05 2,5 0,05
f d
DC-5 4,0 1,05 15,0 0,05 50
c c d
DC-6 1,5 1,05 0,05 60 50
i
Make conditions
b

On-time Off-time Number of
Utilization category
I / I U / U operating
Cos φ
e e
s s
cycles
a
g
AC-3 10 1,05 0,05 10 50
a
g
AC-4 12 1,05 0,05 10 50
I = current made. The making current is expressed in d.c. or a.c. r.m.s. symmetrical values but it is
understood that, for a.c., the actual peak value during the making operation may assume a higher value
than the symmetrical peak value.
I = current made and broken, expressed in d.c. or a.c. r.m.s. symmetrical values
c
I = rated operational current
e
U = applied voltage
U = power frequency or d.c. recovery voltage
r
U = rated operational voltage
e
Cos φ = power factor of test circuit
L / R = time-constant of test circuit

---------------------- Page: 10 ----------------------
60947-4-1 Amend.1 © IEC:2012 – 9 –


Table 7 (continued)

a
 Cos φ = 0,45 for I ≤ 100 A; 0,35 for I > 100 A.
e e

b
The time may be less than 0,05 s, provided that contacts are allowed to become properly seated before re-

opening.

c
Tests to be carried out with an incandescent light load.

d
 If polarity not marked on the device, 25 operating cycles with one polarity and 25 operating cycles with

reverse polarity.

e
The load shall consist of commercially available capacitor combinations to obtain a steady-state reactive

current I calculated according to 9.3.3.3.4. Alternatively capacitive ratings may be derived by capacitor
e
switching tests or assigned on the basis of established practice and experience. As a guide, reference may
be made to the formula given in Table 9 which does not take into account the thermal effects due to harmonic
currents. The available current capacity at the test terminals shall not be less than the prospective current "r".
It can be determined by analytical evaluation.
f
See Table 8.
g
For U / U , a tolerance of ±20 % is accepted.
e
h
The values shown are for stator contactors. For rotor contactors, the test shall be made with a current of four
times the rated rotor operational current and a power factor of 0,95.
i
The make conditions for utilization categories AC-3 and AC-4 shall also be verified. The verification may be
made during the make and break test, but only with the manufacturer's agreement. In this case, the making
current multiples shall be as shown for I / I and the breaking current as shown for I / I . 25 operating cycles

e c e
shall be made at a control supply voltage equal to 110 % of the rated control supply voltage U and
s
25 operating cycles at 85 % of U . The off-times are to be determined from Table 8.
s
j
The manufacturer shall verify the AC-6a rating by testing with a transformer or may derive the rating from the
values for AC-3 according to Table 9.
k
A lower ratio of I / I (locked rotor to full load current) may be used if specified by the manufacturer.
c e
l
The on time shall be long enough in order to reach the stabilized current.
m
Off-time according to Table 8. The value of a discharge resistor shall be determined to reach less than 50 V
at the end of off-time.

---------------------- Page: 11 ----------------------
– 10 – 60947-4-1 Amend.1 © IEC:2012


Table 10 – Conventional operational performance –
Making and breaking conditions according to utilization category


Replace the existing Table 10 by the following new table:

Make and break test conditions


On-time Off-time Number of
Utilization category
I / I U / U Cos φ operating

c e r e
s s
cycles

b c i
0,05 6 000
AC-1 1,0 1,05 0,80

b c i
AC-2 2,0 1,05 0,65 0,05 6 000

a b c i
AC-3 2,0 1,05 0,05 6 000
a b c i
AC-4 6,0 1,05 0,05 6 000
b c i
AC-5a 2,0 1,05 0,45 0,05 6 000
e e b i

AC-5b 1,0 1,05 0,05 60 6 000
g g g g g g
AC-6a
k l m


AC-6b 1 1,05 6 000
b c
AC-8a 1,0 1,05 0,80 0,05 30 000
h, j
a
AC-8b 6,0 1,05 1 9 5 900
d
90
  10 100
On-time Off-time Number of
L / R
Utilization category I / I U / U
operating
c e r e
s s
ms
cycles
b f

DC-1 0,05 c 6 000
1,0 1,05 1,0
b f

c
DC-3 2,5 1,05 2,0 0,05 6 000
b f

c
DC-5 2,5 1,05 7,5 0,05 6 000
e e b f
60
DC-6 1,0 1,05 0,05 6 000
I = current made or broken. Except for AC-5b, AC-6 or DC-6 categories, the making current is expressed in
c
d.c. or a.c. r.m.s. symmetrical values but it is understood that for a.c. the actual peak value during the
making operation may assume a higher value than the symmetrical peak value.
I = rated operational current
e
U = power frequency or d.c. recovery voltage
r
U = rated operational voltage
e
Cos φ = power factor of test circuit
L / R = time-constant of test circuit

---------------------- Page: 12 ----------------------
60947-4-1 Amend.1 © IEC:2012 – 11 –


Table 10 (continued)

a
Cos φ = 0,45 for I ≤ 100 A; 0,35 for I > 100 A.
e e
b

The time may be less than 0,05 s, provided that contacts are allowed to become properly seated before re-
opening.

c
 These off-times shall be not greater than the values specified in Table 8.
d

The manufacturer may choose any value for the Off-time up to 200 s.

e
Tests to be carried out with an incandescent light load.

f
If polarity not marked on the device, 3 000 operating cycles with one polarity and 3 000 operating cycles with

reverse polarity.

g
The manufacturer shall verify the AC-6a rating by testing with a transformer or may derive the rating from the
values for AC-3 according to Table 9.
h
Tests for category AC-8b shall be accompanied by tests for category AC-8a. The tests may be made on
different samples.
i
For manually operated switching devices, the number of operating cycles shall be 1 000 on-load, followed by
5 000 off-load.
j
A lower ratio of I / I (locked rotor to full load current) may be used if specified by the manufacturer.
c e
k
The load shall consist of commercially available capacitor combinations to obtain a steady-state reactive
current I calculated according to 9.3.3.3.4. Alternatively capacitive ratings may be derived by capacitor
e
switching tests or assigned on the basis of established practice and experience. As a guide, reference may
be made to the formula given in Table 9 which does not take into account the thermal effects due to harmonic
currents. The available current capacity at the test terminals shall not be less than the prospective current "r".
It can be determined by analytical evaluation.
l
The on time shall be long enough in order to reach the stabilized current.
m
Off-time according to Table 8. The value of a discharge resistor shall be determined to reach less than 50 V
at the end of off-time.


Add, after the existing Subclause 8.2.4.4, the following new Subclauses 8.2.4.5 and 8.2.4.6:
8.2.4.5 Coil power consumption
Where the power consumption of the coil is given, it shall be tested according to 9.3.3.2.1.2.
8.2.4.6 Pole impedance
Where the pole impedance is given, it shall be tested according to 9.3.3.2.2.2.


8.2.5.1 Performance under short-circuit conditions (rated conditional short-circuit
current)
Add, at the end of this subclause, the following new text:
These tests are applicable to AC motor ratings only.

Delete the existing Subclauses 8.2.6 and 8.2.7.

---------------------- Page: 13 ----------------------
– 12 – 60947-4-1 Amend.1 © IEC:2012


9.2 Compliance with constructional requirements


Replace the existing text by the following new text and new Subclauses 9.2.1, 9.2.2 and 9.2.3:


9.2.1 General


Subclause 8.2 of IEC 60947-1:2007 applies with the following additions:


9.2.2 Electrical performance of screwless-type clamping units

Subclause 8.2.4.7 of IEC 60947-1:2007, Amendment 1 applies with the following changes:


The number of specimens shall be at least 4.
The insertion and disconnection of the conductors shall be made in accordance with the
manufacturer’s instructions.
A suitable test arrangement is shown in Figure 10. If the measurement points cannot be
positioned within the 10 mm to the point of contact, the voltage difference between the ideal
and the actual measuring points shall be deducted from the voltage drop measured. This
voltage difference within the part of the conductor shall be determined with a suitable
measurement method on one specimen at a stabilised temperature. The measurement
methods and the results shall be documented in the test report. The test current is I .
th
NOTE 1 Usually it is possible to equip a IEC 60947-4-1 product with many different types of wires (stranded,
solid, flexible…) which results in a sufficient number of tests for the same terminal.
NOTE 2 Particular testing method with conductor cross sections larger than 10 mm² is under consideration.
NOTE 3 The device sample may be provided with holes or equivalent arrangements which provide measurement
access points for the voltage drop on the terminal.
9.2.3 Ageing test for screwless-type clamping units
Subclause 8.2.4.8 of IEC 60947-1:2007, Amendment 1 applies with the following change:
The test shall be done on the device equipped with the clamping units.
The test current is I .
th
NOTE The device sample may be provided with holes or equivalent arrangements which provide measurement
access points for the voltage drop on the terminal.


9.3.1 Test sequences
Replace, in the existing item e), the item 1) by the following:
1) verification of mechanical properties of terminals (see 8.2.4 of IEC 60947-1:2007,
9.2.1 and 9.2.2);

9.3.3.2.1 Power-operated equipment
Replace the existing text of this subclause, by the following new Subclauses 9.3.3.2.1.1,
9.3.3.2.1.2, 9.3.3.2.1.2.1, 9.3.3.2.1.2.2, 9.3.3.2.1.2.3, 9.3.3.2.1.2.4 and 9.3.3.2.1.3:
9.3.3.2.1.1 General

---------------------- Page: 14 ----------------------
60947-4-1 Amend.1 © IEC:2012 – 13 –


Contactors and starters shall be tested to verify their performance according to the

requirements given in 8.2.1.2.


The drop out test requirements of 8.3.3.2.1 of IEC 60947-1:2007, Amendment 1 applies.


9.3.3.2.1.2 Coil power consumption


9.3.3.2.1.2.1 General


A contactor coil is evaluated for both holding power and pick-up power.


In the case where different coils cover a range of voltages, 5 coils shall be tested as follows:
The coil with the lowest rated control supply voltage U , the coil with the highest rated control
s
supply voltage U , plus 3 coils deemed to be representative of the coils with the highest
s
calculated hold power at the discretion of the manufacturer.
The test shall be performed at ambient temperature +23 °C ± 3 °C. The test shall be made
without any load in the main and auxiliary circuits. The coil shall be supplied with the rated
control supply voltage U and at the rated frequency. For a given coil, where a voltage range
s
is declared, the test shall be made at the highest voltage at the respective frequency.
The measured values shall be obtained with a r.m.s. measurement method covering at least a
bandwidth from 0 Hz to 10 kHz and the resulting power values shall be given within a
measurement uncertainty better than 5 %.
9.3.3.2.1.2.2 Holding power for conventional and electronically controlled
electromagnet
The current measurement I of the coil shall be performed after the coil has been energized
(i)
and has reached a stable temperature.
The holding power consumption is defined as follows:
S = U × I [VA] for a.c. controlled contactor;
h(i) s(i) (i)
P = U × I [W] for d.c. controlled contactor.
c(i) s(i) (i)
The published value shall be equal to the average value of the 5 tested coils.
S = ∑ (U × I ) / 5 [VA] respectively P = ∑ (U × I ) / 5 [W]

h s(i) (i) c s(i) (i)
NOTE The power dissipation for an a.c. controlled contactor can also be expressed in [W], taking into account the
power factor.
9.3.3.2.1.2.3 Pick-up power for a.c. controlled contactor or d.c. controlled contactor
with separate pick-up and hold-on windings
The pick-up measurement shall be performed directly after the measurement of the hold
current (see 9.3.3.2.1.2.2).
The current measurement I of the coil shall be performed immediately after the coil has
(i)
been de-energized, the contactor has been held in the Off position and re-energized.
The pick-up power consumption is defined as follows:
S = U × I [VA] for a.c. controlled contactor;
p(i) s (i)

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P = U × I [W] for d.c. controlled contactor with
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