BS EN IEC 60947-4-1:2019
$256.21
Low-voltage switchgear and controlgear – Contactors and motor-starters. Electromechanical contactors and motor-starters
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 194 |
This part of IEC 60947 is applicable to the following equipment:
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electromechanical contactors and starters including motor protective switching device (MPSD);
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actuators of contactor relays;
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contacts dedicated exclusively to the coil circuit of this contactor or this contactor relay;
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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:
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starters for DC motors 1;
NOTE 1 The requirements for DC motor starters are under consideration for the next maintenance cycle.
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auxiliary contacts of contactors and contacts of contactor relays. These are covered by IEC 60947-5-1;
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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.
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short-circuit protective device integrated within starters other than MPSDs. This is covered by IEC 60947-2 and IEC 60947-3;
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the use of the product with additional measure within explosive atmospheres. These are given in IEC 60079 series;
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embedded software design rules1;
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cyber security aspects. These are covered by IEC 62443 series.
The objective of this document is to state:
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the characteristics of the equipment;
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the conditions applicable to the equipment with reference to:
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its operation and behaviour,
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its dielectric properties,
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its degree of protection,
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its construction including safety measures against electric shock, fire hazard and mechanical hazard;
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the tests intended for confirming that these conditions have been met, and the methods to be adopted for these tests;
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the information to be given with the equipment or in the manufacturer’s literature.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 6 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 11 | English CONTENTS |
| 19 | FOREWORD |
| 22 | INTRODUCTION |
| 23 | 1 Scope |
| 24 | 2 Normative references |
| 25 | 3 Terms, definitions, symbols and abbreviated terms 3.1 General 3.2 Alphabetical index of terms |
| 27 | 3.3 Terms and definitions concerning contactors |
| 28 | 3.4 Terms and definitions concerning starters |
| 34 | 3.5 Terms and definitions concerning characteristic quantities |
| 35 | 3.6 Terms and definitions concerning safety aspects |
| 36 | 3.7 Symbols and abbreviated terms |
| 37 | 4 Classification 5 Characteristics of contactors and starters 5.1 Summary of characteristics |
| 38 | 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 |
| 40 | 5.3.2 Currents or powers |
| 41 | 5.3.3 Rated frequency 5.3.4 Rated duties |
| 42 | 5.3.5 Normal load and overload characteristics |
| 44 | 5.3.6 Short-circuit characteristics |
| 45 | 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 |
| 47 | 5.5 Control circuits Tables Table 1 – Utilization categories |
| 48 | 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 |
| 50 | 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 |
| 51 | 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 |
| 52 | 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 |
| 53 | 6.1.2 Characteristics, basic rated values and utilization |
| 54 | 6.2 Marking |
| 55 | 6.3 Instructions for installation, operation, maintenance, decommissioning and dismantling 6.4 Environmental information 7 Normal service, mounting and transport conditions |
| 56 | 8 Constructional and performance requirements 8.1 Constructional requirements 8.1.1 General 8.1.2 Materials |
| 57 | 8.1.3 Current-carrying parts and their connections 8.1.4 Clearances and creepage distances 8.1.5 Actuator |
| 58 | 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 |
| 59 | 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 |
| 60 | 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 |
| 61 | 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 |
| 62 | 8.1.17 Short-circuit and overload protection of ports 8.2 Performance requirements 8.2.1 Operating conditions |
| 64 | Table 3 – Limits of operation of time-delay overload relays when energized on all poles |
| 65 | Figures Figure 1 – Multiple of current setting limits for ambient air temperature compensated time-delay overload relays |
| 66 | Figure 2 – Thermal memory test |
| 67 | Table 4 – Limits of operation of three-pole time-delay overload relays when energized on two poles only |
| 68 | 8.2.2 Temperature-rise |
| 69 | Table 5 – Temperature-rise limits for insulated coils in air and in oil |
| 70 | 8.2.3 Dielectric properties Table 6 – Intermittent duty test cycle data |
| 71 | 8.2.4 Normal load and overload performance requirements |
| 72 | Table 7 – Making and breaking capacities – Making and breaking conditions according to utilization category |
| 74 | 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 |
| 75 | Table 10 – Conventional operational performance – Making and breaking conditions according to utilization category |
| 77 | 8.2.5 Co-ordination with short-circuit protective devices Table 11 – Overload current withstand requirements |
| 79 | Figure 3 – Examples of co-ordination characteristics of a starter Table 15 – Test conditions for Icd |
| 80 | 8.3 Electromagnetic compatibility (EMC) 8.3.1 General 8.3.2 Immunity |
| 81 | 8.3.3 Emission 9 Tests 9.1 Kinds of test 9.1.1 General Table 12 – Specific acceptance criteria for immunity tests |
| 82 | 9.1.2 Type tests 9.1.3 Routine tests 9.1.4 Sampling tests |
| 83 | 9.1.5 Special tests |
| 84 | 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 |
| 85 | 9.2.4 Limited energy source test 9.2.5 Breakdown of components |
| 86 | 9.3 Compliance with performance requirements 9.3.1 Test sequences |
| 87 | 9.3.2 General test conditions 9.3.3 Performance under no load, normal load and overload conditions |
| 90 | Figure 5 – Example of a pole impedance measurement for a 3 pole contactor |
| 99 | 9.3.4 Performance under short-circuit conditions |
| 101 | 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) |
| 104 | 9.3.5 Overload current withstand capability of contactors 9.3.6 Routine tests and sampling tests |
| 106 | 9.4 EMC tests 9.4.1 General 9.4.2 Immunity Table 16 – EMC immunity tests |
| 108 | 9.4.3 Emission Table 17 – Terminal disturbance voltage limits for conducted radio-frequency emission (for mains ports) |
| 109 | Table 18 – Radiated emission test limits |
| 110 | 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 |
| 111 | Figure A.2 – Overload relays |
| 112 | Annex B (normative) Special tests B.1 General B.2 Mechanical durability B.2.1 General B.2.2 Verification of mechanical durability |
| 114 | B.3 Electrical durability B.3.1 General |
| 115 | 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 |
| 116 | B.4 Coordination at the crossover current between the starter and associated SCPD B.4.1 General and definitions |
| 117 | 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 |
| 118 | Table B.2 – Test conditions |
| 119 | Figure B.1 – Examples of time-current withstand characteristic |
| 120 | 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) |
| 121 | Figure C.2 – Typical curves of currents and torques during an auto-transformer start (see 3.4.4.2) |
| 122 | Figure C.3 – Typical variants of protected starters, combination starters, protected switching devices and combination switching devices |
| 123 | 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) |
| 125 | Figure C.5 – Typical methods and diagrams of starting alternating-current induction motors by means of auto-transformers |
| 126 | Figure C.6 – Examples of speed/time curves corresponding to cases a), b), c), d), e) and f) of 5.3.5.6.1 |
| 127 | Annex D (informative) Items subject to agreement between manufacturer and user |
| 128 | Annex E (Void) |
| 129 | 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 |
| 130 | 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 |
| 131 | F.7.3 Test after conventional operational performance (defined under Table 10) Table F.1 – Test voltage according to altitude |
| 132 | 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 |
| 133 | Table G.1 – Rated operational powers and rated operational currents of motors |
| 136 | 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 |
| 137 | H.4 Test of the control functions |
| 138 | Annex I (informative) AC-1 contactors for use with semiconductor controlled motor load |
| 139 | Annex J (Void) |
| 140 | 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 |
| 141 | Table K.2 – Typical failure ratios for normally open contactors |
| 142 | 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 |
| 143 | L.2.2 Symbols and abbreviations |
| 144 | L.3 Procedure L.3.1 General L.3.2 Safety design process |
| 145 | L.4 Requirements L.4.1 General L.4.2 Safety plan Figure L.1 – Safety design process |
| 146 | L.4.3 Design L.4.4 Failure mode and effects analysis of the safety function |
| 147 | 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 |
| 148 | L.6 Example L.6.1 architecture description Figure L.2 – Typical structure of a thermal overload relay |
| 149 | L.6.2 FMEA Figure L.3 – typical structure of MPSD Table L.1 – Severity |
| 150 | Table L.2 – Occurrence Table L.3 – Detection levels |
| 151 | Table L.4 – Conclusion |
| 152 | Table L.5 – Example of failure mode and effects analysis for thermal overload relay |
| 157 | Annex M (normative) DC contactors for use in photovoltaic (PV) applications M.1 Application M.2 Object M.3 Terms and definitions |
| 158 | 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 |
| 159 | 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 |
| 160 | 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 |
| 161 | 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 |
| 162 | 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 |
| 163 | M.9.7 Critical load current test Figure M.1 – Critical current |
| 164 | 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 |
| 165 | M.9.9 Degree of protection of enclosed contactors M.9.10 EMC M.9.11 Clearance and creepage distances |
| 166 | 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 |
| 167 | N.3.2 Touch current measurement Figure N.1 – Protection by means of protective impedance |
| 168 | Figure N.2 – Measuring instrument |
| 169 | Annex O (informative) Load monitoring indicators O.1 General O.2 Indicators list |
| 170 | Table O.1 – AC monitoring indicators list |
| 171 | O.3 Uncertainty Figure O.1 – Example of quantification of a process change |
| 172 | O.4 Tests O.4.1 Routine tests O.4.2 Type tests Table O.2 – Different possibilities authorized for verification of indicators |
| 173 | Table O.3 – Reference for verification conditions Table O.4 – Harmonic levels |
| 174 | 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 |
| 175 | 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 |
| 176 | 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 |
| 177 | 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 |
| 178 | P.4.3 Verification of dielectric withstand P.4.4 Verification of overload releases P.4.5 Marking |
| 179 | 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 |
| 180 | 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 |
| 181 | Q.5 Verification of selectivity Q.5.1 General Q.5.2 Consideration of selectivity by desk study |
| 182 | Q.5.3 Selectivity determined by test |
| 184 | Figure Q.1 – Over-current co-ordination between a MPSD and a fuse or back-up protection by a fuse: operating characteristics |
| 185 | Figure Q.2 – Total selectivity between MPSD and circuit-breakers – Case 1 Figure Q.3 – Total selectivity between MPSD and circuit-breakers – Case 2 |
| 186 | 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 |
| 187 | Bibliography |
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