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BS EN IEC 60947-4-1:2019:2021 Edition

BS EN IEC 60947-4-1:2019:2021 Edition

$256.21

Low-voltage switchgear and controlgear – Contactors and motor-starters. Electromechanical contactors and motor-starters

Published By Publication Date Number of Pages
BSI 2021 194
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This part of IEC 60947 is applicable to the following equipment:

  • electromechanical contactors and starters including motor protective switching device (MPSD);

  • actuators of contactor relays;

  • contacts dedicated exclusively to the coil circuit of this contactor or this contactor relay;

  • dedicated accessories (e.g. dedicated wiring, dedicated latch accessory);

intended to be connected to distribution circuits, motors circuits and other load circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC.

This document covers also the assessment procedure for electromechanical overload protection used in safety applications such as protecting a motor located in explosive atmosphere from the outside atmosphere: See Annex L.

This document does not apply to:

  • starters for DC motors 1;

    NOTE 1 The requirements for DC motor starters are under consideration for the next maintenance cycle.

  • auxiliary contacts of contactors and contacts of contactor relays. These are covered by IEC 60947-5-1;

  • starter used downstream to frequency drive1;

    NOTE 2 Additional requirements for starter used downstream to frequency drive are under consideration for the next maintenance cycle.

  • short-circuit protective device integrated within starters other than MPSDs. This is covered by IEC 60947-2 and IEC 60947-3;

  • the use of the product with additional measure within explosive atmospheres. These are given in IEC 60079 series;

  • embedded software design rules1;

  • cyber security aspects. These are covered by IEC 62443 series.

The objective of this document is to state:

  1. the characteristics of the equipment;

  2. the conditions applicable to the equipment with reference to:

    1. its operation and behaviour,

    2. its dielectric properties,

    3. its degree of protection,

    4. its construction including safety measures against electric shock, fire hazard and mechanical hazard;

  3. the tests intended for confirming that these conditions have been met, and the methods to be adopted for these tests;

  4. the information to be given with the equipment or in the manufacturer’s literature.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
15 English
CONTENTS
23 FOREWORD
26 INTRODUCTION
27 1 Scope
28 2 Normative references
29 3 Terms, definitions, symbols and abbreviated terms
3.1 General
3.2 Alphabetical index of terms
31 3.3 Terms and definitions concerning contactors
32 3.4 Terms and definitions concerning starters
38 3.5 Terms and definitions concerning characteristic quantities
39 3.6 Terms and definitions concerning safety aspects
40 3.7 Symbols and abbreviated terms
41 4 Classification
5 Characteristics of contactors and starters
5.1 Summary of characteristics
42 5.2 Type of equipment
5.2.1 Kind of equipment
5.2.2 Number of poles
5.2.3 Kind of current (AC or DC)
5.2.4 Interrupting medium (air, oil, gas, vacuum, etc.)
5.2.5 Operating conditions of the equipment
5.3 Rated and limiting values for main circuits
5.3.1 Rated voltages
44 5.3.2 Currents or powers
45 5.3.3 Rated frequency
5.3.4 Rated duties
46 5.3.5 Normal load and overload characteristics
48 5.3.6 Short-circuit characteristics
49 5.3.7 Pole impedance of a contactor (Z)
5.4 Utilization category
5.4.1 General
5.4.2 Assignment of utilization categories based on the results of tests
51 5.5 Control circuits
Tables
Table 1 – Utilization categories
52 5.6 Auxiliary circuits
5.7 Characteristics of relay and release of overload relays and motor protective switching device (MPSD)
5.7.1 Summary of characteristics
5.7.2 Types of relay or release
5.7.3 Characteristic values
54 5.7.4 Designation and current settings of overload relays
5.7.5 Time-current characteristics of overload relays
Table 2 – Trip classes of overload relays
55 5.7.6 Influence of ambient air temperature
5.8 Co-ordination with short-circuit protective devices
5.9 Void
5.10 Types and characteristics of automatic change-over devices and automatic acceleration control devices
5.10.1 Types
5.10.2 Characteristics
56 5.11 Types and characteristics of auto-transformers for two-stepauto-transformer starters
5.12 Types and characteristics of starting resistors for rheostatic rotor starters
6 Product information
6.1 Nature of information
6.1.1 Identification
57 6.1.2 Characteristics, basic rated values and utilization
58 6.2 Marking
59 6.3 Instructions for installation, operation, maintenance, decommissioning and dismantling
6.4 Environmental information
7 Normal service, mounting and transport conditions
60 8 Constructional and performance requirements
8.1 Constructional requirements
8.1.1 General
8.1.2 Materials
61 8.1.3 Current-carrying parts and their connections
8.1.4 Clearances and creepage distances
8.1.5 Actuator
62 8.1.6 Indication of the contact position
8.1.7 Additional requirements for equipment suitable for isolation
8.1.8 Terminals
8.1.9 Additional requirements for equipment provided with a neutral pole
8.1.10 Provisions for protective earthing
8.1.11 Enclosures for equipment
63 8.1.12 Degrees of protection of enclosed equipment
8.1.13 Conduit pull-out, torque and bending with metallic conduits
8.1.14 Limited energy source
64 Table 19 – Limits for limited energy sources without an over-current protective device
Table 20 – Limits for limited energy sources with an over-current protective device
65 8.1.15 Stored charge energy circuit
8.1.16 Fault and abnormal conditions
Table 21 – Limits for limited energy source with current limiting impedance
66 8.1.17 Short-circuit and overload protection of ports
8.2 Performance requirements
8.2.1 Operating conditions
68 Table 3 – Limits of operation of time-delay overload relays when energized on all poles
69 Figures
Figure 1 – Multiple of current setting limits for ambient air temperature compensated time-delay overload relays
70 Figure 2 – Thermal memory test
71 Table 4 – Limits of operation of three-pole time-delay overload relays when energized on two poles only
72 8.2.2 Temperature-rise
73 Table 5 – Temperature-rise limits for insulated coils in air and in oil
74 8.2.3 Dielectric properties
Table 6 – Intermittent duty test cycle data
75 8.2.4 Normal load and overload performance requirements
76 Table 7 – Making and breaking capacities – Making and breaking conditions according to utilization category
78 Table 8 – Relationship between the test current and off-time forthe verification of rated making and breaking capacities
Table 9 – Operational current determination for utilization categories AC-6a and AC-6b when derived from AC-3 ratings
79 Table 10 – Conventional operational performance – Making and breaking conditions according to utilization category
81 8.2.5 Co-ordination with short-circuit protective devices
Table 11 – Overload current withstand requirements
83 Figure 3 – Examples of co-ordination characteristics of a starter
Table 15 – Test conditions for Icd
84 8.3 Electromagnetic compatibility (EMC)
8.3.1 General
8.3.2 Immunity
85 8.3.3 Emission
9 Tests
9.1 Kinds of test
9.1.1 General
Table 12 – Specific acceptance criteria for immunity tests
86 9.1.2 Type tests
9.1.3 Routine tests
9.1.4 Sampling tests
87 9.1.5 Special tests
88 9.2 Compliance with constructional requirements
9.2.1 General
9.2.2 Electrical performance of screwless-type clamping units
9.2.3 Ageing test for screwless-type clamping units
Figure 4 – Voltage drop measurement at contact point of the clamping terminal
89 9.2.4 Limited energy source test
9.2.5 Breakdown of components
90 9.3 Compliance with performance requirements
9.3.1 Test sequences
91 9.3.2 General test conditions
9.3.3 Performance under no load, normal load and overload conditions
94 Figure 5 – Example of a pole impedance measurement for a 3 pole contactor
103 9.3.4 Performance under short-circuit conditions
105 Table 13 – Value of the prospective test current according to the rated operational current
Table 14 – Value of the prospective test current according to the rated operational current (harmonized table)
108 9.3.5 Overload current withstand capability of contactors
9.3.6 Routine tests and sampling tests
110 9.4 EMC tests
9.4.1 General
9.4.2 Immunity
Table 16 – EMC immunity tests
112 9.4.3 Emission
Table 17 – Terminal disturbance voltage limits for conducted radio-frequency emission (for mains ports)
113 Table 18 – Radiated emission test limits
114 Annexes
Annex A (normative) Marking and identification of terminals of contactors, starters and associated overload relays
A.1 General
A.2 Marking and identification of terminals of main circuits
A.3 Marking and identification of terminals of overload relays
Figure A.1 – Main circuit
115 Figure A.2 – Overload relays
116 Annex B (normative) Special tests
B.1 General
B.2 Mechanical durability
B.2.1 General
B.2.2 Verification of mechanical durability
118 B.3 Electrical durability
B.3.1 General
119 B.3.2 Results to be obtained
B.3.3 Statistical analysis of test results for contactors or starters
Table B.1 – Verification of the number of on-load operating cycles – Conditions for making and breaking corresponding to the several utilization categories
120 B.4 Coordination at the crossover current between the starter and associated SCPD
B.4.1 General and definitions
121 B.4.2 Condition for the test for the verification of co-ordination at the crossover current by a direct method
B.4.3 Test currents and test circuits
B.4.4 Test procedure and results to be obtained
B.4.5 Verification of co-ordination at the crossover current by an indirect method
122 Table B.2 – Test conditions
123 Figure B.1 – Examples of time-current withstand characteristic
124 Annex C (informative) Typical characteristics of starters
Figure C.1 – Typical curves of currents and torques during a star-delta start (see 3.4.4.1)
125 Figure C.2 – Typical curves of currents and torques during an auto-transformer start (see 3.4.4.2)
126 Figure C.3 – Typical variants of protected starters, combination starters, protected switching devices and combination switching devices
127 Figure C.4 – Example of three-phase diagram of a rheostatic rotor starter with three starting steps and one direction of rotation (in the case whenall the mechanical switching devices are contactors)
129 Figure C.5 – Typical methods and diagrams of starting alternating-current induction motors by means of auto-transformers
130 Figure C.6 – Examples of speed/time curves corresponding to cases a), b), c), d), e) and f) of 5.3.5.6.1
131 Annex D (informative) Items subject to agreement between manufacturer and user
132 Annex E (Void)
133 Annex F (normative) Requirements for auxiliary contact linked with power contact (mirror contact)
F.1 Application and object
F.1.1 Application
F.1.2 Object
F.2 Terms and definitions
F.3 Characteristics
F.4 Product information
134 F.5 Normal service, mounting and transport conditions
F.6 Constructional and performance requirements
F.7 Tests
F.7.1 General
F.7.2 Tests on products in a new condition
Figure F.1 – Mirror contact
135 F.7.3 Test after conventional operational performance (defined under Table 10)
Table F.1 – Test voltage according to altitude
136 Annex G (informative) Rated operational currents and rated operational powers of switching devices for electrical motors
G.1 General
G.2 Rated operational powers and rated operational currents
137 Table G.1 – Rated operational powers and rated operational currents of motors
140 Annex H (normative) Extended functions to electronic overload relays
H.1 General
H.2 Terms and definitions
H.3 Limits of operation of control functions
H.3.1 General
H.3.2 Limits of electronic overload relay with main circuit under-voltage restarting function
141 H.4 Test of the control functions
142 Annex I (informative) AC-1 contactors for use with semiconductor controlled motor load
143 Annex J (Void)
144 Annex K (normative) Procedure to determine data for electromechanical contactors used in functional safety applications
K.1 General
K.2 Test requirements
K.3 Characterization of a failure mode
K.4 Failure ratios of a contactor
Table K.1 – Failure mode of contactors
145 Table K.2 – Typical failure ratios for normally open contactors
146 Annex L (normative) Assessment procedure for electromechanical overload protection used in safety applications and especially in explosive atmospheres
L.1 Application and object
L.1.1 Application
L.1.2 Object
L.2 Terms, definitions and symbols
L.2.1 Terms and definitions
147 L.2.2 Symbols and abbreviations
148 L.3 Procedure
L.3.1 General
L.3.2 Safety design process
149 L.4 Requirements
L.4.1 General
L.4.2 Safety plan
Figure L.1 – Safety design process
150 L.4.3 Design
L.4.4 Failure mode and effects analysis of the safety function
151 L.4.5 Design plan
L.4.6 Verification
L.4.7 Function assessed
L.5 Documentation
L.5.1 Technical safety documentation
L.5.2 Safety instructions
152 L.6 Example
L.6.1 architecture description
Figure L.2 – Typical structure of a thermal overload relay
153 L.6.2 FMEA
Figure L.3 – typical structure of MPSD
Table L.1 – Severity
154 Table L.2 – Occurrence
Table L.3 – Detection levels
155 Table L.4 – Conclusion
156 Table L.5 – Example of failure mode and effects analysis for thermal overload relay
161 Annex M (normative) DC contactors for use in photovoltaic (PV) applications
M.1 Application
M.2 Object
M.3 Terms and definitions
162 M.4 Classification
M.5 Characteristics
M.5.1 General
M.5.2 Rated impulse withstand voltage
M.5.3 Utilization category
Table M.1 – Rated impulse voltage levels for PV contactors
Table M.2 – Utilization categories
163 M.6 Product information
M.7 Normal service, mounting and transport conditions
M.7.1 General
M.7.2 Ambient air temperature
M.7.3 Altitude
Table M.3 – Ambient air temperature conditions
164 M.8 Constructional and performance requirements
M.8.1 Constructional requirements
M.8.2 Performance requirements
Table M.4 – Verification of rated making and breaking capacities –Conditions for making and breaking corresponding to the DC-PV category
165 M.8.3 Electromagnetic compatibility (EMC)
M.9 Tests
M.9.1 General
M.9.2 Type tests
Table M.5 – Conventional operational performance – Making and breaking condition corresponding to the DC-PV category
166 M.9.3 Making and breaking capacities and conventional operational performance
M.9.4 Thermal cycling test
M.9.5 Climatic test
M.9.6 Dielectric test
Table M.6 – Overall scheme of test sequences
167 M.9.7 Critical load current test
Figure M.1 – Critical current
168 M.9.8 Mechanical properties
Table M.7 – Number of operating cycles corresponding to the critical load current
Table M.8 – Critical load current performance
169 M.9.9 Degree of protection of enclosed contactors
M.9.10 EMC
M.9.11 Clearance and creepage distances
170 Annex N (normative) Additional requirements and tests for equipment with protective separation
N.1 General
N.2 Definitions
N.3 Requirements
N.3.1 Test method for implementing protective impedance
171 N.3.2 Touch current measurement
Figure N.1 – Protection by means of protective impedance
172 Figure N.2 – Measuring instrument
173 Annex O (informative) Load monitoring indicators
O.1 General
O.2 Indicators list
174 Table O.1 – AC monitoring indicators list
175 O.3 Uncertainty
Figure O.1 – Example of quantification of a process change
176 O.4 Tests
O.4.1 Routine tests
O.4.2 Type tests
Table O.2 – Different possibilities authorized for verification of indicators
177 Table O.3 – Reference for verification conditions
Table O.4 – Harmonic levels
178 Annex P (normative) Short-circuit breaking tests of MPSD
P.1 General test conditions
P.2 Rated service short-circuit breaking capacity
P.2.1 General
179 P.2.2 Test of rated service short-circuit breaking capacity
P.2.3 Verification of operational performance capability
P.2.4 Verification of dielectric withstand
180 P.2.5 Verification of temperature-rise
P.2.6 Verification of overload releases
P.3 Rated ultimate short-circuit breaking capacity
P.3.1 General
P.3.2 Verification of overload releases
181 P.3.3 Test of rated ultimate short-circuit breaking capacity
P.3.4 Verification of dielectric withstand
P.3.5 Verification of overload releases
P.4 Test of MPSD for IT system
P.4.1 General
P.4.2 Individual pole short-circuit
182 P.4.3 Verification of dielectric withstand
P.4.4 Verification of overload releases
P.4.5 Marking
183 Annex Q (normative) Co-ordination under short-circuit conditions between a MPSD and another short-circuit protective device associated in the same circuit
Q.1 Application
Q.2 Object
184 Q.3 General requirements for the co-ordination of a MPSD with another SCPD
Q.3.1 General considerations
Q.3.2 Behaviour of C1 in association with another SCPD
Q.4 Type and characteristics of the associated SCPD
185 Q.5 Verification of selectivity
Q.5.1 General
Q.5.2 Consideration of selectivity by desk study
186 Q.5.3 Selectivity determined by test
188 Figure Q.1 – Over-current co-ordination between a MPSD and a fuse or back-up protection by a fuse: operating characteristics
189 Figure Q.2 – Total selectivity between MPSD and circuit-breakers – Case 1
Figure Q.3 – Total selectivity between MPSD and circuit-breakers – Case 2
190 Figure Q.4 – Back-up protection by a circuit-breaker – Operating characteristics – Case 1
Figure Q.5 – Back-up protection by a circuit-breaker – Operating characteristics – Case 2
191 Bibliography

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