IEC 60934:2019
(Main)Circuit breakers for equipment (CBE)
Circuit breakers for equipment (CBE)
IEC 60934:2019 is applicable to mechanical switching devices designed as "circuit‑breakers for equipment" (CBE) for household and similar applications. CBEs according to this document are intended to provide protection to circuits within electrical equipment including its components (e.g. motors, transformers, internal wiring). This document covers also CBEs applicable for protection of electrical equipment in case of undervoltage and/or overvoltage. This document also covers CBEs which are suitable for isolation. This fourth edition cancels and replaces the third edition published in 2000, Amendment 1:2007 and Amendment 2:2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) clarifications for type testing purposes.
Disjoncteurs pour équipement (DPE)
L'IEC 60934:2019 applicable aux appareils mécaniques de connexion désignés sous le nom de "disjoncteurs pour équipement" (DPE) pour applications domestiques et analogues. Selon le présent document, les DPE sont destinés à la protection des circuits internes des équipements électriques, y compris leurs composants (par exemple, les moteurs, les transformateurs, le câblage interne). Le présent document couvre aussi les DPE applicables pour la protection des équipements électriques en cas de sous-tension et/ou de surtension. Le présent document couvre aussi les DPE qui sont aptes au sectionnement. Cette quatrième édition annule et remplace la troisième édition parue en 2000, l’Amendement 1:2007 et l’Amendement 2:2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) éclaircissements relatifs à la finalité des essais de type.
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Standards Content (Sample)
IEC 60934 ®
Edition 4.0 2019-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Circuit-breakers for equipment (CBE)
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IEC 60934 ®
Edition 4.0 2019-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Circuit-breakers for equipment (CBE)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.40; 29.120.50 ISBN 978-2-8322-6549-9
– 2 – IEC 60934:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 8
1 Scope and object . 10
2 Normative references . 10
3 Terms and definitions . 13
3.1 Definitions related to protection and switching devices . 13
3.2 General terms . 15
3.3 Definitions related to current . 16
3.4 Definitions related to voltage . 17
3.5 Definitions related to constructional elements of a CBE . 18
3.6 Definitions related to releases in CBEs . 20
3.7 Definitions related to insulation coordination and clearances in a CBE . 21
3.8 Definitions related to operation of CBEs . 23
3.9 Definitions related to the operating characteristic of CBEs . 25
3.10 Definitions related to characteristic quantities . 25
3.11 Definitions concerning coordination of CBEs and SCPDs associated in the
same circuit . 26
3.12 Definitions related to terminals and terminations . 27
3.13 Definitions related to tests . 30
4 Classification . 30
4.1 General . 30
4.2 Quantity of poles . 30
4.3 Method of mounting . 30
4.4 Method of connection . 31
4.5 Method of operation . 31
4.6 Mode of tripping . 31
4.6.1 CBEs tripping by current (overcurrent) . 31
4.6.2 CBEs tripping by by overcurrent and voltage . 31
CBE-switch .
4.7 Influence of the ambient temperature . 31
4.8 Trip-free behaviour . 32
4.9 Influence of the mounting position . 32
4.10 Electrical performance . 32
4.11 Suitability for isolation . 32
5 Characteristics of CBEs . 32
5.1 List of characteristics . 32
5.2 Rated quantities . 33
5.2.1 General . 33
5.2.2 Rated voltages . 33
5.2.3 Rated current (I ) . 33
n
5.2.4 Rated frequency . 34
5.2.5 Rated switching capacity (rated making and breaking capacity) . 34
5.2.6 Rated conditional short-circuit current (I ) . 34
nc
5.2.7 Rated short-circuit capacity (I ) . 34
cn
5.3 Standard and preferred values . 34
5.3.1 Preferred values of rated voltage . 34
5.3.2 Standard rated frequencies . 35
5.3.3 Standard values of rated conditional short-circuit current . 35
6 Marking and other product information . 35
7 Standard conditions for operation in service . 36
7.1 General . 36
7.2 Ambient air temperature . 36
7.2.1 Reference ambient air temperature T for calibration . 36
7.2.2 Limits of ambient air temperature for operation in service . 37
7.3 Altitude . 37
7.4 Atmospheric conditions . 37
8 Requirements for construction and operation . 37
8.1 Mechanical design . 37
8.1.1 General . 37
8.1.2 Mechanism . 37
8.1.3 Clearances and creepage distances (see Annex B) . 38
8.1.4 Screws, current-carrying parts and connections . 43
8.1.5 Screw-type and screwless terminals . 43
8.1.6 Solder terminations . 47
8.1.7 Flat quick-connect male tabs (Figures E.6 to E.13) . 47
8.2 Protection against electric shock . 50
8.3 Temperature-rise . 50
8.3.1 Temperature-rise limits . 50
8.3.2 Ambient air temperature . 51
8.4 Dielectric properties . 51
8.4.1 Dielectric strength at power frequency . 51
8.4.2 Clearances for insulation coordination . 51
8.5 Conditions for automatic operation . 52
8.5.1 Standard time-current zone . 52
8.5.2 Tripping characteristic . 52
8.5.3 Operating limits of overvoltage releases . 53
8.5.4 Operating limits of undervoltage and zero-voltage releases . 53
8.5.5 Electrical endurance of undervoltage releases . 53
8.6 Electrical performance and behaviour at rated short-circuit capacity . 54
8.7 Performance under conditional short-circuit current conditions . 54
8.8 Resistance to mechanical shock and impact . 54
8.9 Resistance to heat . 54
8.10 Resistance to abnormal heat and to fire . 54
8.11 Resistance to tracking . 54
8.12 Resistance to rusting . 54
9 Tests . 58
9.1 Type tests and sequences . 58
9.2 Test conditions . 59
9.3 Test of indelibility of marking . 60
9.4 Test of reliability of terminals, current-carrying parts and connections . 60
9.4.1 Screw type and screwless terminals . 60
9.4.2 Solder terminations . 62
9.4.3 Flat quick-connect male tabs . 62
9.5 Test of reliability of terminals for external conductors (see 3.12.15) . 63
9.6 Test of protection against electric shock . 64
– 4 – IEC 60934:2019 RLV © IEC 2019
9.7 Test of dielectric properties . 65
9.7.1 Resistance to humidity . 65
9.7.2 Insulation resistance of the main circuit . 65
9.7.3 Dielectric strength of the main circuit . 66
9.7.4 Dielectric strength of the auxiliary circuits . 66
9.7.5 Value of test voltage . 66
9.7.6 Test for the verification of insulation coordination by impulse withstand
voltage test . 67
9.8 Test of temperature-rise . 68
9.8.1 Ambient air temperature . 68
9.8.2 Test procedure . 68
9.8.3 Measurement of the temperature of parts . 69
9.8.4 Temperature-rise of a part . 69
9.9 28-day test . 69
9.10 Test of tripping characteristics . 69
9.10.1 General . 69
9.10.2 Test of time-current characteristic . 70
9.10.3 Test of instantaneous tripping (of the magnetic release) . 70
9.10.4 Test of effect of single-pole loading on the tripping characteristic of
multi-pole CBEs . 70
9.10.5 Test of effect of ambient temperature on the tripping characteristic . 70
9.11 Verification of electrical operational capability . 70
9.11.1 General requirements . 70
9.11.2 Behaviour at rated current (or under low overloads for R-type and J-
type CBEs) . 72
9.11.3 Behaviour at rated switching capacity . 72
9.11.4 Behaviour at rated short-circuit capacity . 72
9.11.5 Test of overvoltage releases at operating limits . 74
9.11.6 Behaviour of undervoltage and zero-voltage releases . 74
9.12 Conditional short-circuit current tests . 74
9.12.1 General . 74
9.12.2 Values of test quantities . 75
9.12.3 Tolerances on test quantities . 75
9.12.4 Test procedure . 75
9.13 Test of resistance to mechanical shock and impact . 77
9.14 Tests of resistance to heat . 77
9.15 Test of resistance to abnormal heat and to fire . 78
9.16 Test of resistance to tracking . 78
9.17 Test of resistance to rusting . 79
Annex A (normative) Time-current zone (see 9.10 and Table 9) . 86
Annex B (normative) Determination of clearances and creepage distances . 87
Annex C (normative) Test sequences and number of samples to be submitted for
certification purposes . 89
C.1 Test sequences . 89
C.2 Number of samples to be submitted for full test procedure . 90
C.3 Number of samples to be submitted for simplified test procedure in case of
submitting simultaneously a series of CBEs of the same basic design. 90
Annex D (normative) Correspondence between ISO and AWG copper conductors . 92
Annex E (normative) Examples of terminals . 93
Annex F (informative) Coordination between a CBE and a short-circuit protective
device (SCPD) associated in the same circuit . 102
F.1 Introduction General . 102
F.2 Scope Overview . 102
F.3 General requirements for co-ordination of a CBE with an associated SCPD . 103
F.3.1 General considerations . 103
F.3.2 Requirements concerning back-up protection . 103
F.3.3 Requirements concerning discrimination . 103
F.3.4 Required information . 103
F.4 Verification of coordination . 104
F.4.1 General considerations including the conditions for verification by desk
study . 104
F.4.2 Verification of discrimination . 104
F.4.3 Verification of coordinated back-up protection . 105
F.5 Examples of verification of coordination by desk study . 106
Annex G (normative) Electromagnetic behaviour of CBEs . 114
G.1 General . 114
G.2 Immunity . 114
G.2.1 CBEs not incorporating electronic circuits . 114
G.2.2 CBEs incorporating electronic circuits . 114
G.3 Emission . 115
G.3.1 CBEs not incorporating electronic circuits . 115
G.3.2 CBEs incorporating electronic circuits . 115
Annex H (normative) Correlation between nominal voltage of the supply systems and
the line-to-neutral voltage relevant for determining the rated impulse voltage . 116
Annex I (normative) Routine or statistical tests . 118
I.1 General . 118
I.2 Verification of the tripping characteristic . 118
I.3 Verification of dielectric strength . 118
Annex J (normative) Additional requirements for electrical performance of E-type
CBEs . 120
Annex (normative) Additional requirements for electrical performance
of CBE-switches .
Annex K (normative) Additional requirements for CBEs suitable for isolation . 122
K.1 General . 122
K.6 Marking and other product information . 122
K.8 Requirements for construction and operation . 122
Bibliography . 120
Figure 1 – Thread-forming screw . 80
Figure 2 – Thread-cutting screw . 80
Figure 3 – Test circuits for overcurrent tests of CBEs . 82
Figure 4 – Standard test finger (see IEC 60529) . 83
Figure 5 – Ball pressure apparatus . 84
Figure 6 – Arrangements and dimensions of the electrodes for the tracking test . 84
Figure 7 – Test circuits for verification of the conditional short-circuit current . 85
Figure A.1 – Time-current zone . 86
– 6 – IEC 60934:2019 RLV © IEC 2019
Figure B.1 – Illustrations of the application of the recommendations for creepage
distances . 88
Figure E.1 – Examples of pillar terminals . 93
Figure E.2 – Examples of screw terminals and stud terminals . 94
Figure E.3 – Examples of saddle terminals . 95
Figure E.4 – Examples of lug terminals . 95
Figure E.5 – Examples of screwless terminals . 96
Figure E.6 – Dimensions of male tabs . 97
Figure E.7 – Dimensions of round dimple detents of male tabs (see Figure E.6) . 98
Figure E.8 – Dimensions of rectangular dimple detents of male tabs (see Figure E.6) . 98
Figure E.9 – Dimensions of hole detents of male tabs (see Figure E.6) . 98
Figure E.10 – Dimensions of male tabs . 99
Figure E.11 – Dimensions of male tabs . 99
Figure E.12 – Dimensions of male tabs . 99
Figure E.13 – Dimensions of male tabs for two different sizes of female connectors
(see 8.1.7.1) . 100
Figure E.14 – Dimensions of female connectors for male tabs . 101
Figure F.1 – Thermal only CBE, backed up by thermal magnetic circuit-breaker . 107
Figure F.2 – Thermal only CBE, backed up by a fuse . 108
Figure F.3 – Thermal-magnetic CBE backed up by thermal-magnetic circuit-breaker . 109
Figure F.4 – Hydraulic-magnetic CBE backed up by thermal-magnetic circuit-breaker . 110
Figure F.5 – Thermal CBE backed up by a hydraulic-magnetic circuit-breaker . 110
Figure F.6 – Energy-limiting CBE, backed up by thermal-magnetic circuit-breaker . 111
Figure F.7 – Energy-limiting CBE, backed up by a fuse . 112
Figure F.8 – Examples illustrating proper and improper coordination . 113
Table 1 – Minimum clearances for basic and reinforced insulation . 40
Table 2 – Minimum creepage distances . 42
Table 3 – Connectable cross-sectional areas of external copper conductors for screw-
type and screwless terminals . 44
Table 4 – Minimum distance between clamping screw and the end of conductor when
fully inserted . 45
Table 5 – Dimensions of tabs in millimetres – Dimensions A, B, C, D, E, F, J, M, N, P
and Q . 48
Table 6 – Dimensions of tabs in millimetres – Dimensions H, I, T, K, R, G, L, S and U . 49
Table 7 – Dimensions in millimetres of combined male tabs for two different sizes of
female connectors . 49
Table 8 – Temperature-rise values for CBEs for different reference ambient air
temperatures (T) . 51
Table 9 – Time-current operating characteristics . 52
Table 10 – Operating limits of undervoltage and zero-voltage releases (for AC and DC) . 53
Table 11 – Test conditions for electrical performance for CBEs intended for general
use, including inductive circuits . 55
Table 12 – Test conditions for electrical performance of CBEs used in essentially
resistive circuits only (see Clause 6, item d) . 57
Table 13 – List of type tests . 59
Table 14 – Standard cross-sections of copper conductors corresponding to the rated
currents . 60
Table 15 – Screw-thread diameter and applied torques . 61
Table 16 – Insertion and withdrawal forces . 62
Table 17 – Push/pull force . 63
Table 18 – Pulling forces . 63
Table 19 – Make-up of conductors for the test of 9.5.4 . 64
Table 20 – Test voltages . 67
Table 21 – Impulse withstand test voltages for verification of insulation coordination . 68
Table 22 – Power factor and time constant of test circuit . 75
Table C.1 – Test sequences . 89
Table C.2 – Number of samples for full test procedure . 90
Table C.3 – Reduction of samples for simplified test procedure . 91
Table D.1 – Correspondence between ISO and AWG conductor cross-sections . 92
Table G.1 – Minimum EMC immunity performances of CBEs. 115
Table H.1 – Nominal voltages and corresponding rated impulse voltages . 116
Table K.1 – Minimum clearances for CBEs suitable for isolation, between live parts
separated when the contacts are in the open position, as a function of the rated
impulse withstand voltage . 123
Table K.2 – Minimum creepage distances for CBEs suitable for isolation, between live
parts separated when the contacts are in the open position . 123
Table K.3 – Test voltages for verifying isolation across the open contacts, as a function
of the rated impulse withstand voltage and the altitude where the test is carried out . 125
– 8 – IEC 60934:2019 RLV © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CIRCUIT-BREAKERS FOR EQUIPMENT (CBE)
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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This redline version of the official IEC Standard allows the user to identify the changes
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International Standard IEC 60934 has been prepared by subcommittee 23E: Circuit-breakers
and similar equipment for household use, of IEC technical committee 23: Electrical
accessories.
The text of this International Standard is based on the following documents:
FDIS Report on voting
23E/1084/FDIS 23E/1104/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This fourth edition cancels and replaces the third edition published in 2000, Amendment
1:2007 and Amendment 2:2013. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) clarifications for type testing purposes.
In this standard, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
– 10 – IEC 60934:2019 RLV © IEC 2019
CIRCUIT-BREAKERS FOR EQUIPMENT (CBE)
1 Scope and object
This International Standard is applicable to mechanical switching devices designed as "circuit-
breakers for equipment" (CBE) intended to provide protection to circuits within electrical
equipment.
NOTE 1 The term "equipment" includes appliances.
NOTE 2 The protected components are usually motors, transformers, internal wiring, etc.
CBEs may have a rated short-circuit capacity higher than that required for overload conditions
and may, in addition, have a conditional short-circuit current rating in association with a
specified short-circuit protective device (SCPD).
This standard is also applicable to switching devices for protection of electrical equipment in
case of undervoltage and/or overvoltage.
It is applicable for a.c. not exceeding 440 V and/or d.c. not exceeding 250 V and a rated
current not exceeding 125 A.
This standard covers CBEs which are intended for
– automatic interruption and non-automatic or automatic resetting;
– automatic interruption and non-automatic or automatic resetting and manual switching
operation.
It also covers CBE-switches, in which the means for automatic interruption are inhibited or not
present by construction (see 3.1.3).
NOTE 3 This standard may be used as a guiding document for voltages up to 630 V a.c.
NOTE 4 Requirements for CBEs suitable for isolation are under consideration.
This standard contains all the requirements necessary to ensure compliance with the
operational characteristics required for these devices by type tests.
It also contains the details relative to test requirements and methods of testing necessary to
ensure reproducibility of test results.
This document is applicable to mechanical switching devices designed as "circuit-breakers for
equipment" (CBE) for household and similar applications. CBEs according to this document
are intended to provide protection to circuits within electrical equipment including its
components (e.g. motors, transformers, internal wiring). This document covers also CBEs
applicable for protection of electrical equipment in case of undervoltage and/or overvoltage.
This document also covers CBEs which are suitable for isolation.
NOTE The term "equipment" includes appliances.
CBEs are not applicable for overcurrent protection of wiring installations of buildings.
CBEs according to this document have:
– a rated voltage not exceeding 440 V AC (between phases) and/or DC not exceeding
250 V;
– a rated current not exceeding 125 A;
– a short-circuit capacity (I ) of at least 6 × I (AC types) and 4 × I (DC types) but not
cn n n
exceeding 3 000 A.
CBEs may have a conditional short-circuit current (I ) rating in association with a specified
nc
short-circuit protective device (SCPD). A guide for coordination of a CBE associated in the
same circuit with a SCPD is given in Annex F.
For CBEs having a degree of protection higher than IP20 according to IEC 60529, for use in
locations where hazardous environmental conditions prevail (e.g. excessive humidity, heat or
cold or deposition of dust) and in hazardous locations (e.g. where explosions are liable to
occur), special constructions may be required.
This document contains all the requirements necessary to ensure compliance with the
operational characteristics required for these devices by type tests. It also contains the details
relative to test requirements and methods of testing necessary to ensure reproducibility of test
results.
This document states:
a) the characteristics of CBEs;
b) the conditions with which CBEs shall comply, with reference to:
1) their operation and behaviour in normal service;
2) their operation and behaviour in case of overload;
3) their operation and behaviour in case of short-circuits up to their rated short-circuit
capacity;
4) their dielectric properties;
c) the tests intended for confirming that these conditions have been met and the methods to
be adopted for the tests;
d) the data to be marked on the devices;
e) the test sequences to be carried out and the number of samples to be submitted for
certification purposes (see Annex C);
f) the routine tests to be carried out to reveal unacceptable variations in material or
manufacture, likely to affect safety (see Annex I).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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.
IEC 60050(151):1978, International Electrotechnical Vocabulary (IEV) – Chapter 151:
Electrical and magnetic devices
IEC 60050(441):1984, International Electrotechnical Vocabulary (IEV) – Chapter 441:
Switchgear, controlgear and fuses
IEC 60050(604):1987, International Electrotechnical Vocabulary (IEV) – Chapter 604:
Generation, transmission and distribution of electricity – Operation
IEC 60050(826):1982, International Electrotechnical Vocabulary (IEV) – Chapter 826:
Electrical installations of buildings
Amendment 1 (1990)
– 12 – IEC 60934:2019 RLV © IEC 2019
Amendment 2 (1995)
Amendment 3 (1999)
IEC 60060-1:1989 2010, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60068-2-20:1979, Environmental testing – Part 2-20: Tests – Test T: Test methods for
solderability and resistance to soldering heat of devices with leads
IEC 60099-1:1991, Surge arresters – Part 1: Non-linear resistor type gapped arresters for a.c.
1)
systems
IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V
IEC 60269 (all parts), Low-voltage fuses
IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-
symbols.info/equipment)
IEC 60417-1:1998, Graphical symbols for use on equipment – Part 1: Overview and
application
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems
IEC 60664-1:1992 2007, Insulation coordination for equipment within low-voltage systems –
Part 1: Principles, requirements and tests
IEC 60664-3:1992, Insulation coordination for equipment within low-voltage systems – Part 3:
...
IEC 60934 ®
Edition 4.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Circuit-breakers for equipment (CBE)
Disjoncteurs pour équipement (DPE)
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IEC 60934 ®
Edition 4.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Circuit-breakers for equipment (CBE)
Disjoncteurs pour équipement (DPE)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.40; 29.120.50 ISBN 978-2-8322-6391-4
– 2 – IEC 60934:2019 © IEC 2019
CONTENTS
FOREWORD . 8
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 12
3.1 Definitions related to protection and switching devices . 12
3.2 General terms . 13
3.3 Definitions related to current . 15
3.4 Definitions related to voltage . 16
3.5 Definitions related to constructional elements of a CBE . 16
3.6 Definitions related to releases in CBEs . 18
3.7 Definitions related to insulation coordination . 20
3.8 Definitions related to operation of CBEs . 22
3.9 Definitions related to the operating characteristic of CBEs . 23
3.10 Definitions related to characteristic quantities . 23
3.11 Definitions concerning coordination of CBEs and SCPDs associated in the
same circuit . 24
3.12 Definitions related to terminals and terminations . 25
3.13 Definitions related to tests . 28
4 Classification . 28
4.1 General . 28
4.2 Quantity of poles . 28
4.3 Method of mounting . 28
4.4 Method of connection . 29
4.5 Method of operation . 29
4.6 Mode of tripping . 29
4.6.1 CBEs tripping by current (overcurrent) . 29
4.6.2 CBEs tripping by voltage . 29
4.7 Influence of the ambient temperature . 30
4.8 Trip-free behaviour . 30
4.9 Influence of the mounting position . 30
4.10 Electrical performance . 30
4.11 Suitability for isolation . 30
5 Characteristics of CBEs . 30
5.1 List of characteristics . 30
5.2 Rated quantities . 30
5.2.1 General . 30
5.2.2 Rated voltages . 30
5.2.3 Rated current (I ) . 31
n
5.2.4 Rated frequency . 31
5.2.5 Rated switching capacity (rated making and breaking capacity) . 31
5.2.6 Rated conditional short-circuit current (I ) . 32
nc
5.2.7 Rated short-circuit capacity (I ) . 32
cn
5.3 Standard and preferred values . 32
5.3.1 Preferred values of rated voltage . 32
5.3.2 Standard rated frequencies . 32
5.3.3 Standard values of rated conditional short-circuit current . 32
6 Marking and other product information . 33
7 Standard conditions for operation in service . 34
7.1 General . 34
7.2 Ambient air temperature . 34
7.2.1 Reference ambient air temperature T for calibration . 34
7.2.2 Limits of ambient air temperature for operation in service . 34
7.3 Altitude . 34
7.4 Atmospheric conditions . 35
8 Requirements for construction and operation . 35
8.1 Mechanical design . 35
8.1.1 General . 35
8.1.2 Mechanism . 35
8.1.3 Clearances and creepage distances (see Annex B) . 36
8.1.4 Screws, current-carrying parts and connections . 39
8.1.5 Screw-type and screwless terminals . 40
8.1.6 Solder terminations . 43
8.1.7 Flat quick-connect male tabs (Figures E.6 to E.13) . 43
8.2 Protection against electric shock . 46
8.3 Temperature-rise . 46
8.3.1 Temperature-rise limits . 46
8.3.2 Ambient air temperature . 47
8.4 Dielectric properties . 47
8.4.1 Dielectric strength at power frequency . 47
8.4.2 Clearances for insulation coordination . 47
8.5 Conditions for automatic operation . 48
8.5.1 Standard time-current zone . 48
8.5.2 Tripping characteristic . 48
8.5.3 Operating limits of overvoltage releases . 49
8.5.4 Operating limits of undervoltage and zero-voltage releases . 49
8.5.5 Electrical endurance of undervoltage releases . 49
8.6 Electrical performance and behaviour at rated short-circuit capacity . 49
8.7 Performance under conditional short-circuit current conditions . 50
8.8 Resistance to mechanical shock and impact . 50
8.9 Resistance to heat . 50
8.10 Resistance to abnormal heat and to fire . 50
8.11 Resistance to tracking . 50
8.12 Resistance to rusting . 50
9 Tests . 52
9.1 Type tests and sequences . 52
9.2 Test conditions . 53
9.3 Test of indelibility of marking . 54
9.4 Test of reliability of terminals, current-carrying parts and connections . 54
9.4.1 Screw type and screwless terminals . 54
9.4.2 Solder terminations . 56
9.4.3 Flat quick-connect male tabs . 56
9.5 Test of reliability of terminals for external conductors (see 3.12.15) . 57
9.6 Test of protection against electric shock . 58
9.7 Test of dielectric properties . 59
– 4 – IEC 60934:2019 © IEC 2019
9.7.1 Resistance to humidity . 59
9.7.2 Insulation resistance of the main circuit . 59
9.7.3 Dielectric strength of the main circuit . 60
9.7.4 Dielectric strength of the auxiliary circuits . 60
9.7.5 Value of test voltage . 60
9.7.6 Test for the verification of insulation coordination by impulse withstand
voltage test . 61
9.8 Test of temperature-rise . 62
9.8.1 Ambient air temperature . 62
9.8.2 Test procedure . 62
9.8.3 Measurement of the temperature of parts . 63
9.8.4 Temperature-rise of a part . 63
9.9 28-day test . 63
9.10 Test of tripping characteristics . 63
9.10.1 General . 63
9.10.2 Test of time-current characteristic . 64
9.10.3 Test of instantaneous tripping (of the magnetic release) . 64
9.10.4 Test of effect of single-pole loading on the tripping characteristic of
multi-pole CBEs . 64
9.10.5 Test of effect of ambient temperature on the tripping characteristic . 64
9.11 Verification of electrical operational capability . 64
9.11.1 General requirements . 64
9.11.2 Behaviour at rated current (or under low overloads for R-type and J-
type CBEs) . 66
9.11.3 Behaviour at rated switching capacity . 66
9.11.4 Behaviour at rated short-circuit capacity . 66
9.11.5 Test of overvoltage releases at operating limits . 68
9.11.6 Behaviour of undervoltage and zero-voltage releases . 68
9.12 Conditional short-circuit current tests . 68
9.12.1 General . 68
9.12.2 Values of test quantities . 69
9.12.3 Tolerances on test quantities . 69
9.12.4 Test procedure . 69
9.13 Test of resistance to mechanical shock and impact . 71
9.14 Tests of resistance to heat . 71
9.15 Test of resistance to abnormal heat and to fire . 72
9.16 Test of resistance to tracking . 72
9.17 Test of resistance to rusting . 73
Annex A (normative) Time-current zone (see 9.10 and Table 9) . 79
Annex B (normative) Determination of clearances and creepage distances . 80
Annex C (normative) Test sequences and number of samples to be submitted for
certification purposes . 82
C.1 Test sequences . 82
C.2 Number of samples to be submitted for full test procedure . 83
C.3 Number of samples to be submitted for simplified test procedure in case of
submitting simultaneously a series of CBEs of the same basic design. 83
Annex D (normative) Correspondence between ISO and AWG copper conductors . 85
Annex E (normative) Examples of terminals . 86
Annex F (informative) Coordination between a CBE and a short-circuit protective
device (SCPD) associated in the same circuit . 95
F.1 General . 95
F.2 Overview. 95
F.3 General requirements for co-ordination of a CBE with an associated SCPD . 96
F.3.1 General considerations . 96
F.3.2 Requirements concerning back-up protection . 96
F.3.3 Requirements concerning discrimination . 96
F.3.4 Required information . 96
F.4 Verification of coordination . 97
F.4.1 General considerations including the conditions for verification by desk
study . 97
F.4.2 Verification of discrimination . 97
F.4.3 Verification of coordinated back-up protection . 98
F.5 Examples of verification of coordination by desk study . 99
Annex G (normative) Electromagnetic behaviour of CBEs . 107
G.1 General . 107
G.2 Immunity . 107
G.2.1 CBEs not incorporating electronic circuits . 107
G.2.2 CBEs incorporating electronic circuits . 107
G.3 Emission . 108
G.3.1 CBEs not incorporating electronic circuits . 108
G.3.2 CBEs incorporating electronic circuits . 108
Annex H (normative) Correlation between nominal voltage of the supply systems and
the line-to-neutral voltage relevant for determining the rated impulse voltage . 109
Annex I (normative) Routine or statistical tests . 110
I.1 General . 110
I.2 Verification of the tripping characteristic . 110
I.3 Verification of dielectric strength . 110
Annex J (normative) Additional requirements for electrical performance of E-type
CBEs . 112
Annex K (normative) Additional requirements for CBEs suitable for isolation . 113
K.1 General . 113
K.6 Marking and other product information . 113
K.8 Requirements for construction and operation . 113
Bibliography . 117
Figure 1 – Thread-forming screw . 74
Figure 2 – Thread-cutting screw . 74
Figure 3 – Test circuits for overcurrent tests of CBEs . 75
Figure 4 – Standard test finger (see IEC 60529) . 76
Figure 5 – Ball pressure apparatus . 77
Figure 6 – Arrangements and dimensions of the electrodes for the tracking test . 77
Figure 7 – Test circuits for verification of the conditional short-circuit current . 78
Figure A.1 – Time-current zone . 79
Figure B.1 – Illustrations of the application of the recommendations for creepage
distances . 81
Figure E.1 – Examples of pillar terminals . 86
Figure E.2 – Examples of screw terminals and stud terminals . 87
– 6 – IEC 60934:2019 © IEC 2019
Figure E.3 – Examples of saddle terminals . 88
Figure E.4 – Examples of lug terminals . 88
Figure E.5 – Examples of screwless terminals . 89
Figure E.6 – Dimensions of male tabs . 90
Figure E.7 – Dimensions of round dimple detents of male tabs (see Figure E.6) . 91
Figure E.8 – Dimensions of rectangular dimple detents of male tabs (see Figure E.6) . 91
Figure E.9 – Dimensions of hole detents of male tabs (see Figure E.6) . 91
Figure E.10 – Dimensions of male tabs . 92
Figure E.11 – Dimensions of male tabs . 92
Figure E.12 – Dimensions of male tabs . 92
Figure E.13 – Dimensions of male tabs for two different sizes of female connectors
(see 8.1.7.1) . 93
Figure E.14 – Dimensions of female connectors for male tabs . 94
Figure F.1 – Thermal only CBE, backed up by thermal magnetic circuit-breaker . 100
Figure F.2 – Thermal only CBE, backed up by a fuse . 101
Figure F.3 – Thermal-magnetic CBE backed up by thermal-magnetic circuit-breaker . 102
Figure F.4 – Hydraulic-magnetic CBE backed up by thermal-magnetic circuit-breaker . 103
Figure F.5 – Thermal CBE backed up by a hydraulic-magnetic circuit-breaker . 103
Figure F.6 – Energy-limiting CBE, backed up by thermal-magnetic circuit-breaker . 104
Figure F.7 – Energy-limiting CBE, backed up by a fuse . 105
Figure F.8 – Examples illustrating proper and improper coordination . 106
Table 1 – Minimum clearances for basic and reinforced insulation . 37
Table 2 – Minimum creepage distances . 38
Table 3 – Connectable cross-sectional areas of external copper conductors for screw-
type and screwless terminals . 40
Table 4 – Minimum distance between clamping screw and the end of conductor when
fully inserted . 42
Table 5 – Dimensions of tabs in millimetres – Dimensions A, B, C, D, E, F, J, M, N, P
and Q . 44
Table 6 – Dimensions of tabs in millimetres – Dimensions H, I, T, K, R, G, L, S and U . 45
Table 7 – Dimensions in millimetres of combined male tabs for two different sizes of
female connectors . 45
Table 8 – Temperature-rise values for CBEs for different reference ambient air
temperatures (T) . 47
Table 9 – Time-current operating characteristics . 48
Table 10 – Operating limits of undervoltage and zero-voltage releases (for AC and DC) . 49
Table 11 – Test conditions for electrical performance for CBEs intended for general
use, including inductive circuits . 51
Table 12 – Test conditions for electrical performance of CBEs used in essentially
resistive circuits only (see Clause 6, item d) . 52
Table 13 – List of type tests . 53
Table 14 – Standard cross-sections of copper conductors corresponding to the rated
currents . 54
Table 15 – Screw-thread diameter and applied torques . 55
Table 16 – Insertion and withdrawal forces . 56
Table 17 – Push/pull force . 57
Table 18 – Pulling forces . 57
Table 19 – Make-up of conductors for the test of 9.5.4 . 58
Table 20 – Test voltages . 61
Table 21 – Impulse withstand test voltages for verification of insulation coordination . 62
Table 22 – Power factor and time constant of test circuit . 69
Table C.1 – Test sequences . 82
Table C.2 – Number of samples for full test procedure . 83
Table C.3 – Reduction of samples for simplified test procedure . 84
Table D.1 – Correspondence between ISO and AWG conductor cross-sections . 85
Table G.1 – Minimum EMC immunity performances of CBEs. 108
Table H.1 – Nominal voltages and corresponding rated impulse voltages . 109
Table K.1 – Minimum clearances for CBEs suitable for isolation, between live parts
separated when the contacts are in the open position, as a function of the rated
impulse withstand voltage . 114
Table K.2 – Minimum creepage distances for CBEs suitable for isolation, between live
parts separated when the contacts are in the open position . 114
Table K.3 – Test voltages for verifying isolation across the open contacts, as a function
of the rated impulse withstand voltage and the altitude where the test is carried out . 116
– 8 – IEC 60934:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CIRCUIT-BREAKERS FOR EQUIPMENT (CBE)
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60934 has been prepared by subcommittee 23E: Circuit-breakers
and similar equipment for household use, of IEC technical committee 23: Electrical
accessories.
The text of this International Standard is based on the following documents:
FDIS Report on voting
23E/1084/FDIS 23E/1104/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This fourth edition cancels and replaces the third edition published in 2000, Amendment
1:2007 and Amendment 2:2013. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) clarifications for type testing purposes.
In this standard, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 10 – IEC 60934:2019 © IEC 2019
CIRCUIT-BREAKERS FOR EQUIPMENT (CBE)
1 Scope
This document is applicable to mechanical switching devices designed as "circuit-breakers for
equipment" (CBE) for household and similar applications. CBEs according to this document
are intended to provide protection to circuits within electrical equipment including its
components (e.g. motors, transformers, internal wiring). This document covers also CBEs
applicable for protection of electrical equipment in case of undervoltage and/or overvoltage.
This document also covers CBEs which are suitable for isolation.
NOTE The term "equipment" includes appliances.
CBEs are not applicable for overcurrent protection of wiring installations of buildings.
CBEs according to this document have:
– a rated voltage not exceeding 440 V AC (between phases) and/or DC not exceeding
250 V;
– a rated current not exceeding 125 A;
) of at least 6 × I (AC types) and 4 × I (DC types) but not
– a short-circuit capacity (I
cn n n
exceeding 3 000 A.
CBEs may have a conditional short-circuit current (I ) rating in association with a specified
nc
short-circuit protective device (SCPD). A guide for coordination of a CBE associated in the
same circuit with a SCPD is given in Annex F.
For CBEs having a degree of protection higher than IP20 according to IEC 60529, for use in
locations where hazardous environmental conditions prevail (e.g. excessive humidity, heat or
cold or deposition of dust) and in hazardous locations (e.g. where explosions are liable to
occur), special constructions may be required.
This document contains all the requirements necessary to ensure compliance with the
operational characteristics required for these devices by type tests. It also contains the details
relative to test requirements and methods of testing necessary to ensure reproducibility of test
results.
This document states:
a) the characteristics of CBEs;
b) the conditions with which CBEs shall comply, with reference to:
1) their operation and behaviour in normal service;
2) their operation and behaviour in case of overload;
3) their operation and behaviour in case of short-circuits up to their rated short-circuit
capacity;
4) their dielectric properties;
c) the tests intended for confirming that these conditions have been met and the methods to
be adopted for the tests;
d) the data to be marked on the devices;
e) the test sequences to be carried out and the number of samples to be submitted for
certification purposes (see Annex C);
f) the routine tests to be carried out to reveal unacceptable variations in material or
manufacture, likely to affect safety (see Annex I).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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.
IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60068-2-20, Environmental testing – Part 2-20: Tests – Test T: Test methods for
solderability and resistance to soldering heat of devices with leads
IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V
IEC 60417, Graphical symbols for use on equipment (available at http://www.graphical-
symbols.info/equipment)
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60664-3, Insulation coordination for equipment within low-voltage systems – Part 3: Use
of coating, potting or moulding for protection against pollution
IEC 60695-2-10, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedure
IEC 60898-1:2015, Electrical accessories – Circuit-breakers for overcurrent protection for
household and similar installations – Part 1: Circuit-breakers for a.c. operation
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques –Electrical fast transient/burst immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measuremen
...
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