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BS EN 60947-2:2006+A2:2013

BS EN 60947-2:2006+A2:2013

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Low-voltage switchgear and controlgear – Circuit-breakers

Published By Publication Date Number of Pages
BSI 2013 236
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This standard applies to circuit-breakers, the main contacts of which are intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c.; it also contains additional requirements for integrally fused circuit-breakers.

It applies whatever the rated currents, the method of construction or the proposed applications of the circuit-breakers may be.

The requirements for circuit-breakers which are also intended to provide earth-leakage protection are contained in Annex B.

The additional requirements for circuit-breakers with electronic over-current protection are contained in Annex F.

The additional requirements for circuit-breakers for IT systems are contained in Annex H.

The requirements and test methods for electromagnetic compatibility of circuit-breakers are contained in Annex J.

The requirements for circuit-breakers not fulfilling the requirements for over-current protection are contained in Annex L.

The requirements for modular residual current devices (without integral current breaking device) are contained in Annex M.

The requirements and test methods for electromagnetic compatibility of circuit-breaker auxiliaries are contained in Annex N.

Supplementary requirements for circuit-breakers used as direct-on-line starters are given in IEC 60947-4-1, applicable to low-voltage contactors and starters.

The requirements for circuit-breakers for the protection of wiring installations in buildings and similar applications, and designed for use by uninstructed persons, are contained in IEC 60898.

The requirements for circuit-breakers for equipment (for example electrical appliances) are contained in IEC 60934.

For certain specific applications (for example traction, rolling mills, marine service) particular or additional requirements may be necessary.

NOTE Circuit-breakers which are dealt with in this standard may be provided with devices for automatic opening under predetermined conditions other than those of over-current and undervoltage as, for example, reversal of power or current. This standard does not deal with the verification of operation under such pre-determined conditions.

The object of this standard is to state:

  1. the characteristics of circuit-breakers;

  2. the conditions with which circuit-breakers shall comply with reference to:

    1. operation and behaviour in normal service;

    2. #operation and behaviour in case of overload and operation and behaviour in case of short-circuit, including co-ordination in service (selectivity and back-up protection);#

    3. dielectric properties;

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

  4. information to be marked on or given with the apparatus.

PDF Catalog

PDF Pages PDF Title
6 CONTENTS
11 1 General
1.1 Scope and object
12 1.2 Normative references
14 2 Definitions
17 3 Classification
18 4 Characteristics of circuit-breakers
4.1 Summary of characteristics
19 4.2 Type of circuit-breaker
4.3 Rated and limiting values of the main circuit
21 Table 1 โ€“ Standard ratios between Ics and Icu
22 Table 2 โ€“ Ratio n between short-circuit making capacity and short-circuit breaking capacity and related power factor (for a.c. circuit-breakers)
Table 3 โ€“ Minimum values of rated short-time withstand current
23 4.4 Utilization categories
4.5 Control circuits
Table 4 โ€“ Utilization categories
Table 5 โ€“ Preferred values of the rated control supply voltage, if different from that of the main circuit
24 4.6 Auxiliary circuits
4.7 Releases
25 4.8 Integral fuses (integrally fused circuit-breakers)
5 Product information
5.1 Nature of the information
26 5.2 Marking
27 5.3 Instructions for installation, operation and maintenance
6 Normal service, mounting and transport conditions
7 Constructional and performance requirements
7.1 Constructional requirements
29 7.2 Performance requirements
31 Table 6 โ€“ Characteristics of the opening operation of inverse time-delay over-current opening releases at the reference temperature
33 Table 7 โ€“ Temperature-rise limits for terminals and accessible parts
34 Table 8 โ€“ Number of operating cycles
35 7.3 Electromagnetic compatibility (EMC)
8 Tests
8.1 Kind of tests
36 8.2 Compliance with constructional requirements
8.3 Type tests
38 Table 9 โ€“ Overall schema of test sequences
39 Table 9a โ€“ Applicability of test sequences according to the relationship between Ics, Icu and Icw
45 Table 10 โ€“ Number of samples for test
47 Table 11 โ€“ Values of power factors and time constants corresponding to test currents
58 Table 12 โ€“ Test circuit characteristics for overload performance
66 8.4 Routine tests
70 Figure 1 โ€“ Test arrangement (connecting cables not shown) for short-circuit tests
71 Annex A (normative) Co-ordination under short-circuit conditions between a circuit-breaker and another short-circuit protective device associated in the same circuit
73 Untitled
76 Figure A.1 โ€“ Over- current co-ordination between a circuit-breaker and a fuse or back-up protection by a fuse: operating characteristics
77 Figure A.2 Figure A.3 โ€“ Total discrimination between two circuit-breakers
78 Figure A.4 Figure A.5 โ€“ Back-up protection by a circuit-breaker โ€“ Operating characteristics
79 Figure A.6 โ€“ Example of test circuit for conditional short-circuit breaking capacity tests showing cable connections for a 3-pole circuit-breaker (C1)
81 Annex B (normative) Circuit-breakers incorporating residual current protection
86 Table B.1 โ€“ Operating characteristic for non-time-delay type
87 Table B.2 โ€“ Operating characteristic for time-delay-type having a limiting non-actuating time of 0,06 s
91 Table B.3 โ€“ Requirements for CBRs functionally dependent on line voltage
94 Table B.4 โ€“ Additional test sequences
99 Table B.5 โ€“ Tripping current range for CBRs in case of an earth fault comprising a d.c. component
105 Figure B.1 โ€“ Test circuit for the verification of the operating characteristic (see B.8.2)
106 Figure B.2 โ€“ Test circuit for the verification of the limiting value of the non-operating current under over-current conditions (see B.8.5)
107 Figure B.3 โ€“ Test circuit for the verification of the behaviour of CBRs classified under B.3.1.2.2 (see B.8.9)
108 Figure B.4 โ€“ Current ring wave 0,5 ยตs/100 kHz
109 Figure B.5 โ€“ Example of test circuit for the verification of resistance to unwanted tripping
Figure B.6 โ€“ Surge current wave 8/20 ยตs
110 Figure B.7 โ€“ Test circuit for the verification of resistance to unwanted tripping in case of flashover without follow-on current (B.8.6.2)
111 Figure B.8 โ€“ Test circuit for the verification of the correct operation of CBRs, in the case of residual pulsating direct currents (see B.8.7.2.1, B.8.7.2.2 and B.8.7.2.3)
112 Figure B.9 โ€“ Test circuit for the verification of the correct operation of CBRs, in the case of a residual pulsating direct current superimposed by a smooth direct residual current (see B.8.7.2.4)
113 Annex C (normative) Individual pole short-circuit test sequence
114 Annex D Vacant
115 Annex E (informative) Items subject to agreement between manufacturer and user
116 Annex F (normative) Additional tests for circuit-breakers with electronic over-current protection
121 Table F.1 โ€“ Test parameters for current dips and interruptions
125 Figure F.1 โ€“ Representation of test current produced by back-to-back thyristors in accordance with F.4.1
126 Figure F.2 โ€“ Test circuit for immunity and emission tests in accordance with F.4.1.3, F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 โ€“ Two phase poles in series
127 Figure F.3 โ€“ Test circuit for immunity and emission tests in accordance with F.4.1.3, F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 โ€“ Three phase poles in series
128 Figure F.4 โ€“ Test circuit for immunity and emission tests in accordance with F.4.1.3, F.4.2, F.4.3, F.4.6, F.4.7.1, F.5.4 and F.6.2 โ€“ Three-phase connection
129 Figure F.5 โ€“ Test current for the verification of the influence of the current dips and interruptions in accordance with F.4.7.1
130 Figure F.6 โ€“ Circuit for electrical fast transients/bursts (EFT/B) immunity test in accordance with F.4.4 โ€“ Two phase poles in series
131 Figure F.7 โ€“ Circuit for electrical fast transients/bursts (EFT/B) immunity test in accordance with F.4.4 โ€“ Three phase poles in series
132 Figure F.8 โ€“ Circuit for electrical fast transients/bursts (EFT/B) immunity test in accordance with F.4.4 โ€“ Three-phase connection
133 Figure F.9 โ€“ Test circuit for the verification of the influence of surges in the main circuit (line-to-earth) in accordance with F.4.5 โ€“ Two phase poles in series
134 Figure F.10 โ€“ Test circuit for the verification of the influence of surges in the main circuit (line-to-earth) in accordance with F.4.5 โ€“ Three phase poles in series
135 Figure F.11 โ€“ Test circuit for the verification of the influence of surges in the main circuit (line-to-earth) in accordance with F.4.5 โ€“ Three-phase connection
136 Figure F.12 โ€“ Test circuit for the verification of the influence of current surges in the main circuit in accordance with F.4.5 โ€“ Two phase poles in series
Figure F.13 โ€“ Test circuit for the verification of the influence of current surges in the main circuit in accordance with F.4.5 โ€“ Three phase poles in series
137 Figure F.14 โ€“ Test circuit for the verification of the influence of current surges in the main circuit in accordance with F.4.5 โ€“ Three-phase connection
Figure F.15 โ€“ Temperature variation cycles at a specified rate of change in accordance with F.9.1
138 Figure F.16 โ€“ General test set up for immunity tests
139 Figure F.17 โ€“ Test set up for the verification of immunity to radiated r.f. electromagnetic fields
140 Figure F.18 โ€“ Test set up for the verification of immunity to electrical fast transients/bursts (EFT/B) on power lines
141 Figure F.19 โ€“ Test set up for verification of immunity to electrical fast transients/bursts (EFT/B) on signal lines
142 Figure F.20 โ€“ General test set-up for the verification of immunity to conducted disturbances induced by r.f. fields (common mode)
143 Figure F.21 โ€“ Arrangement of connections for the verification of immunity to conducted disturbances induced by r.f. fields โ€“ Two phase poles in series configuration
144 Figure F.22 โ€“ Arrangement of connections for the verification of immunity to conducted disturbances induced by r.f. fields โ€“ Three phase poles in series configuration
145 Figure F.23 โ€“ Arrangement of connections for the verification of immunity to conducted disturbances induced by r.f. fields โ€“ Three-phase configuration
146 Annex G (normative) Power loss
148 Figure G.1 โ€“ Example of power loss measurement according to G.2.1
Figure G.2 โ€“ Example of power loss measurement according to G.2.2 and G.2.3
149 Annex H (normative) Test sequence for circuit-breakers for IT systems
151 Annex J (normative) Electromagnetic compatibility (EMC) โ€“ Requirements and test methods for circuit-breakers
153 Table J.1 โ€“ EMC โ€“ Immunity tests
154 Table J.2 โ€“ Reference data for immunity test specifications
157 Table J.3 โ€“ EMC โ€“ Emission tests
Table J.4 โ€“ Reference data for emission test specifications
159 Figure J.1 โ€“ EUT mounted in a metallic enclosure
160 Figure J.2 โ€“ Test set up for the measurement of radiated r.f. emissions
161 Figure J.3 โ€“ Test set up for the verification of immunity to electrostatic discharges
162 Figure J.4 โ€“ Test set up for the verification of immunity to radiated r.f. electromagnetic fields
163 Figure J.5 โ€“ Test set up for the verification of immunity to electrical fast transients/bursts (EFT/B) on power lines
164 Figure J.6 โ€“ Test set up for the verification of immunity to electrical fast transients/bursts (EFT/B) on signal lines
165 Annex K (informative) Glossary of symbols related to products covered by this standard
167 Figure K.1 โ€“ Relationship between symbols and tripping characteristics
174 Annex L (normative) Circuit-breakers not fulfilling the requirements for overcurrent protection
179 Annex M (normative) Modular residual current devices (without integral current breaking device)
185 Table M.1 โ€“ Product information
187 Table M.2 โ€“ Requirements for MRCDs with voltage source
189 Table M.3 โ€“ Test sequences
203 Figure M.1 โ€“ Test circuits for the verification of operation in the case of a steady increase of residual current
204 Figure M.2 โ€“ Test circuits for the verification of operation in the case of a sudden appearance of residual current (with breaking device)
205 Figure M.3 โ€“ Test circuits for the verification of operation in the case of a sudden appearance of residual current (without breaking device)
206 Figure M.4 โ€“ Test circuits for the verification of the limiting value of non-operating current under overcurrent conditions
207 Figure M.5 โ€“ Test circuits for the verification of the resistance to unwanted tripping in the case of loading of the network capacitance
208 Figure M.6 โ€“ Test circuit for the verification of the resistance to unwanted tripping in the case of flashover without follow-on current
209 Figure M.7 โ€“ Test circuits for the verification of operation in the case of a continuous rise of a residual pulsating direct current
210 Figure M.8 โ€“ Test circuits for the verification of operation in the case of a sudden appearance of residual pulsating direct current (without breaking device)
211 Figure M.9 โ€“ Test circuits for the verification of operation in the case of a sudden appearance of residual pulsating direct current (with breaking device)
212 Figure M.10 โ€“ Test circuits for the verification of operation in the case of a residual pulsating direct current superimposed by smooth direct current of 6 mA
213 Figure M.11 โ€“ Test circuits for the verification of operation in the case of a slowly rising residual smooth direct current
214 Figure M.12 โ€“ Test circuits for the verification of operation in the case of a sudden appearance of residual smooth direct current (without breaking device)
215 Figure M.13 โ€“ Test circuits for the verification of operation in the case of a sudden appearance of residual smooth direct current (with breaking device)
216 Figure M.14 โ€“ Test circuits for the verification of operation in the case of a slowly rising residual current resulting from a fault in a circuit fed by a three-pulse star or a six-pulse bridge connection
217 Figure M.15 โ€“ Test circuits for the verification of operation in the case of a slowly rising residual current resulting from a fault in a circuit fed by a two-pulse bridge connection line-to-line
218 Figure M.16 โ€“ Test circuit for the verification of the behaviour of MRCDs with separate sensing means in the case of a failure of the sensor means connection
219 Figure M.17 โ€“ Test circuit for the verification of the behaviour of MRCD with separate sensing means under short-circuit conditions
220 Figure M.18 โ€“ Test circuit for the verification of the behaviour of MRCD with integral sensing means under short-circuit conditions
221 Figure M.19 โ€“ Test circuit for the verification of the behaviour of terminal type MRCD under short-circuit conditions
222 Figure M.20 โ€“ Verification of immunity to radiated r.f. electromagnetic fields โ€“ Test set-up for MRCD with separate sensing means (additional to the test of Annex B)
223 Figure M.21 โ€“ Verification of immunity to electrical fast transients/bursts (EFT/B) on the sensing means connection of an MRCD with separate sensing means (additional to the test of Annex B)
Figure M.22 โ€“ Verification of immunity to conducted disturbances induced by r.f. fields โ€“ Test set up for MRCD with separate sensing means (additional to the test of Annex B)
224 Annex N (normative) Electromagnetic compatibility (EMC) โ€“ Additional requirements and test methods for devices not covered by Annexes B, F and M
228 Annex O (normative) Instantaneous trip circuit-breakers (ICB)
231 Bibliography
BS EN 60947-2:2006+A2:2013
$215.11