IEC 61009-1:2024

Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules

IEC 61009-1:2024 gives general requirements and tests for residual current operated circuit‑breakers with integral overcurrent protection for household and similar uses (hereafter referred to as RCBOs), for rated operational voltages not exceeding 440 V AC, with rated frequencies of 50 Hz, 60 Hz or 50/60 Hz and rated currents not exceeding 125 A and rated short‑circuit capacities not exceeding 25 000 A.
This fourth edition cancels and replaces the third edition published in 2010, Amendment 1:2012 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) harmonization of all clauses between the IEC 61008, IEC 61009 and IEC 60755 series using blocks and modules approach;
b) harmonization of all tables and figures between the IEC 61008, IEC 61009 and IEC 60755 series;
c) terms and definitions are now referred to IEC 62873-2;
d) modification of Subclause 4.1 for classification according to supply conditions;
e) new Subclauses 8.17 and 9.24 for requirements and tests for the resistance to temporary overvoltages (TOV);
f) improvement of Subclause 9.7 for test of dielectric properties;
g) tests for screwless, flat-quick terminals and aluminium conductors are now referred to in the IEC 62873-3 series.

Interrupteurs automatiques à courant différentiel résiduel avec dispositif de protection contre les surintensités incorporé pour usages domestiques et analogues (DD) – Partie 1: Règles générales

L'IEC 61009-1:2024 spécifie les exigences générales et les essais relatifs aux interrupteurs automatiques à courant différentiel résiduel avec dispositif de protection contre les surintensités incorporé pour usages domestiques et analogues (ci-après appelés DD), de tension d'emploi assignée inférieure ou égale à 440 V en courant alternatif avec une fréquence assignée de 50 Hz, 60 Hz ou 50/60 Hz, un courant assigné inférieur ou égal à 125 A et des pouvoirs de coupure et de fermeture en court‑circuit assignés inférieurs ou égaux à 25 000 A.
Cette quatrième édition annule et remplace la troisième édition parue en 2010, son Amendement 1:2012 et son Amendement 2:2013. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) harmonisation de tous les articles entre les séries IEC 61008, IEC 61009 et IEC 60755 par une approche fondée sur les blocs et les modules;
b) harmonisation de tous les tableaux et de toutes les figures entre les séries IEC 61008, IEC 61009 et IEC 60755;
c) les termes et définitions renvoient désormais à l'IEC 62873-2;
d) modification du 4.1 relatif à la classification selon les conditions d'alimentation;
e) de nouveaux paragraphes 8.17 et 9.24 ont été ajoutés pour les exigences et les essais de résistance aux surtensions temporaires (TOV);
f) amélioration du 9.7 relatif à l'essai des propriétés diélectriques;
g) les essais des bornes sans vis, des bornes plates à connexion rapide et des conducteurs en aluminium renvoient désormais à la série IEC 62873-3.
La présente version bilingue (2025-11) correspond à la version anglaise monolingue publiée en 2024-11.
La version française de cette norme n'a pas été soumise au vote.

General Information

• Status: Published
• Publication Date: 20-Nov-2024
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: SC 23E - Circuit-breakers and similar equipment for household use
• Drafting Committee: WG 2 - TC 23/SC 23E/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 21-Nov-2024
• Completion Date: 06-Dec-2024

Relations

• Revises: IEC 61009-1:2010 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Revises: IEC 61009-1:2010/AMD2:2013 - Amendment 2 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Revises: IEC 61009-1:2010/AMD1:2012 - Amendment 1 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Revises: IEC 61009-1:2010/AMD2:2013/COR1:2014 - Corrigendum 1 - Amendment 2 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023

Overview

IEC 61009-1:2024 - Residual current operated circuit‑breakers with integral overcurrent protection (RCBOs) - Part 1: General rules, is the 4th edition international standard that defines general requirements and mandatory tests for RCBOs for household and similar uses. It applies to devices with rated operational voltages up to 440 V AC, rated frequencies 50 Hz, 60 Hz or 50/60 Hz, rated currents up to 125 A, and rated short‑circuit capacities up to 25 000 A. This edition supersedes the 2010 edition and its amendments and constitutes a technical revision with harmonization and new test requirements.

Key Topics and Requirements

The standard establishes construction, performance and testing rules for RCBOs, covering:

• Classification and rated values
  • Classification according to supply conditions, number of poles/current paths and adjustable residual operating current.
  • Rated voltages, rated currents (In ≤ 125 A), rated frequency and rated short‑circuit capacity (Icn ≤ 25 000 A).
• Construction and safety
  • Mechanical design, terminals (including screwless and flat‑quick), clearances and creepage, and protection against electric shock.
• Electrical performance
  • Operating characteristics for residual currents, overcurrent response, temperature‑rise limits and mechanical/electrical endurance.
• Dielectric and transient requirements
  • Improved dielectric property tests (Subclause 9.7) and resistance to temporary overvoltages (TOV) (new Subclauses 8.17 and 9.24).
• Short‑circuit and making/breaking capability
  • Tests for short‑circuit behaviour, verification of I²t and peak current, and rated residual making and breaking capacity (IΔm).
• Reliability and environmental robustness
  • Resistance to mechanical shock/impact, heat, fire behaviour, EMC and marking/installation conditions.
• Harmonization and references
  • Harmonized clause structure, tables and figures with IEC 61008 and IEC 60755 using a blocks/modules approach; terms and definitions now referenced to IEC 62873-2; terminal and conductor tests referenced to IEC 62873-3.

Applications and Who Uses This Standard

IEC 61009-1:2024 is essential for:

• RCBO manufacturers designing products for household and similar applications.
• Test laboratories and certification bodies performing compliance testing and type approval.
• Electrical safety engineers and product designers specifying protective devices in distribution boards.
• Specifiers, utilities and regulators referencing internationally harmonized safety and performance criteria.
• Installers and OEMs selecting compliant RCBOs for residential and light commercial applications.

Related Standards

• IEC 61008 (residual current circuit-breakers without integral overcurrent protection)
• IEC 60755 (series related requirements)
• IEC 62873-2 (terms and definitions)
• IEC 62873-3 (terminal and conductor tests)

Keywords: IEC 61009-1:2024, RCBOs, residual current operated circuit-breaker, overcurrent protection, TOV, dielectric tests, rated short‑circuit capacity, household electrical safety.

Standards Content (Sample)

IEC 61009-1 ®
Edition 4.0 2024-11
INTERNATIONAL
STANDARD
Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) –
Part 1: General rules
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IEC 61009-1 ®
Edition 4.0 2024-11
INTERNATIONAL
STANDARD
Residual current operated circuit-breakers with integral overcurrent protection

for household and similar uses (RCBOs) –

Part 1: General rules
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.50  ISBN 978-2-8327-0011-2

– 2 – IEC 61009-1:2024 © IEC 2024
CONTENTS
FOREWORD . 10
INTRODUCTION . 12
1 Scope . 13
2 Normative references . 15
3 Terms and definitions . 16
4 Classification . 16
4.1 According to the supply conditions . 16
4.1.1 RCBO operating correctly on the occurrence of residual current . 16
4.1.2 RCBO with 2 or 4 current paths operating correctly on the occurrence of
residual current within the voltage range of 1,1 U and 85 V . 17
e
4.1.3 RCBO according to 4.1.2 fitted with a functional earth (FE) and able to
continue to provide protection when supplied from just one phase and
FE . 17
4.1.4 RCBO with 3 current paths operating correctly on the occurrence of
residual current within the voltage range of 1,1 U and 0,7 U . 17
e e
4.1.5 RCBO operating correctly on the occurrence of residual current within
the voltage range 1,1 U and U . 17
e x
4.1.6 RCBO according to 4.1.5, however reclosing automatically after
restoration of the supply voltage . 17
4.2 According to the possibility of adjusting the residual operating current . 17
4.3 According to their operation in response to the type of residual current . 17
4.4 According to time-delay (in the presence of a residual current) . 18
4.5 According to the protection against external influences . 18
4.6 According to the method of mounting . 18
4.7 According to the method of connection . 18
4.8 According to the type of terminals . 18
4.9 According to the number of poles and current paths . 18
4.10 According to the instantaneous tripping current . 19
4.11 According to the I t characteristics . 19
5 Characteristics of RCBOs . 19
5.1 Summary of characteristics . 19
5.2 Rated quantities and other characteristics . 20
5.2.1 Rated voltages . 20
5.2.2 Rated current (I ) . 20
n
5.2.3 Rated frequency . 20
5.2.4 Rated short-circuit capacity (I ) . 20
cn
5.2.5 Rated residual operating current (I ) . 20
Δn
5.2.6 Rated residual non-operating current (I ) . 21
Δno
5.2.7 Rated residual making and breaking capacity (I ) . 21
Δm
5.2.8 Void . 21
5.2.9 Void . 21
5.2.10 Operating characteristics in response to the type of residual current . 21
5.2.11 RCBO type S . 21
5.3 Standard and preferred values . 21
5.3.1 Standard values of rated operational voltage (U ) . 21
e
5.3.2 Preferred values of rated current (I ) . 21
n
5.3.3 Standard values of rated residual operating current (I ) . 21
Δn
5.3.4 Standard value of residual non-operating current (I ) . 22
Δno
5.3.5 Preferred values of rated frequency . 22
5.3.6 Standard values of rated impulse withstand voltage (U ) . 22
imp
5.3.7 Standard limit values of break time and non-actuating time for RCBO of
type AC and A . 22
5.3.8 Void . 22
5.3.9 Void . 22
5.3.10 Void . 22
5.3.11 Minimum value of the rated residual making and breaking capacity

(I ) . 22
Δm
5.3.12 Void . 22
5.3.13 Void . 22
5.3.14 Values of rated short-circuit capacity . 22
5.3.15 Standard ranges of overcurrent instantaneous tripping . 23
6 Marking and other product information . 23
7 Standard conditions for operation in service and for installation . 24
7.1 Standard conditions . 24
7.2 Conditions of installation . 24
7.3 Pollution degree . 24
8 Requirements for construction and operation . 24
8.1 Mechanical design . 24
8.1.1 General . 24
8.1.2 Mechanism . 25
8.1.3 Clearances, creepage distances and solid insulation . 26
8.1.4 Screws, current-carrying parts and connections . 27
8.1.5 Terminals for external conductors . 28
8.1.6 Non-interchangeability . 30
8.2 Protection against electric shock . 30
8.3 Dielectric properties and isolating capability . 31
8.4 Temperature-rise . 31
8.4.1 General . 31
8.4.2 Temperature-rise limits . 31
8.4.3 Ambient air temperature . 31
8.5 Operating characteristics . 31
8.5.1 General . 31
8.5.2 Operation in response to the type of residual current . 31
8.5.3 Operation in presence of a residual current equal to or greater than I . 32
Δn
8.5.4 Operation under overcurrent conditions . 32
8.6 Mechanical and electrical endurance . 33
8.7 Performance at short-circuit currents . 33
8.8 Resistance to mechanical shock and impact . 33
8.9 Resistance to heat . 33
8.10 Resistance to abnormal heat and to fire . 34
8.11 Test device . 34
8.12 Void . 34
8.13 Void . 34

– 4 – IEC 61009-1:2024 © IEC 2024
8.14 Behaviour of RCBOs in the event of current surges caused by impulse
voltages . 34
8.15 Reliability . 35
8.16 Electromagnetic compatibility (EMC) . 35
8.17 Resistance to temporary overvoltages (TOV) . 35
9 Tests . 35
9.1 General . 35
9.2 Test conditions . 35
9.3 Test of indelibility of marking . 36
9.4 Test of reliability of screws, current-carrying parts and connections . 37
9.5 Test of reliability of screw-type terminals for external copper conductors . 37
9.6 Verification of protection against electric shock . 39
9.7 Test of dielectric properties . 39
9.7.1 Resistance to humidity . 39
9.7.2 Insulation resistance of the main circuit . 40
9.7.3 Dielectric strength of the main circuit . 41
9.7.4 Insulation resistance and dielectric strength of auxiliary circuits. 41
9.7.5 Secondary circuit of detection transformers . 42
9.7.6 Capability of control circuits connected to the main circuit to withstand
high DC voltages due to insulation measurements . 42
9.7.7 Verification of impulse withstand voltages . 42
9.8 Test of temperature-rise . 44
9.8.1 Ambient air temperature . 44
9.8.2 Test procedure . 44
9.8.3 Measurement of the temperature of parts . 45
9.8.4 Temperature-rise of a part . 45
9.9 Verification of the operating characteristics . 45
9.9.1 Verification of the operating characteristics under residual current
conditions . 45
9.9.2 Verification of the operating characteristic under overcurrent conditions . 45
9.10 Verification of mechanical and electrical endurance . 47
9.10.1 General test conditions . 47
9.10.2 Test procedure . 47
9.10.3 Condition of the RCBO after test . 48
9.11 Short-circuit tests . 48
9.11.1 General conditions for test . 48
9.11.2 Test circuit for short-circuit performance . 49
9.11.3 Values of test quantities . 50
9.11.4 Tolerances on test quantities . 50
9.11.5 Power factor of the test circuit . 50
9.11.6 Measurement and verification of I t and of the peak current (I ) . 50
p
9.11.7 Calibration of the test circuit . 51
9.11.8 Interpretation of records . 51
9.11.9 Condition of the RCBO for test. 51
9.11.10 Behaviour of the RCBO during short-circuit tests . 52
9.11.11 Test procedure . 53
9.11.12 Verification of the RCBO after short-circuit test . 56
9.11.13 Verification of the rated residual making and breaking capacity (I ) . 56
Δm
9.12 Verification of resistance to mechanical shock and impact . 57

9.12.1 Mechanical shock . 57
9.12.2 Mechanical impact . 58
9.13 Test of resistance to heat . 60
9.13.1 Test on complete RCBOs . 60
9.13.2 Ball pressure test . 61
9.14 Test of resistance to abnormal heat and to fire . 62
9.15 Verification of the trip-free mechanism . 63
9.16 Verification of the operation of the test device at the limits of rated
operational voltage . 63
9.17 Void . 63
9.18 Void . 63
9.19 Verification of the behaviour of RCBOs in the event of current surges caused
by impulse voltages . 63
9.19.1 Current surge test for all RCBOs (0,5 µs/100 kHz ring wave test) . 63
9.19.2 Verification of the behaviour at surge currents up to 3 000 A (8/20 µs
surge current test) . 64
9.20 Verification of reliability . 65
9.20.1 Climatic test. 65
9.20.2 Test with temperature of 40 °C . 66
9.21 Verification of withstand against ageing . 67
9.22 Electromagnetic compatibility (EMC) . 67
9.23 Test of resistance to rusting . 67
9.24 Verification of the behaviour of the RCBO under temporary overvoltage

(TOV) conditions . 68
9.24.1 General . 68
9.24.2 TOV test for all RCBOs . 68
9.24.3 Additional tests for RCBOs with a terminal intended to be connected to
the PE . 68
9.24.4 Verification after the tests . 68
Annex A (normative) Test sequence and number of samples to be submitted for
certification purposes . 99
Annex B (normative) Determination of clearances and creepage distances . 100
B.1 General . 100
B.2 Creepage distances where more than one material is used . 100
B.3 Creepage distances split by floating conductive part . 100
B.4 Measurement of creepage distances and clearances . 100
Annex C (normative) Arrangement for the detection of the emission of ionized gases

during short-circuit tests . 105
Annex D (normative) Routine tests . 108
D.1 General . 108
D.2 Tripping test . 108
D.3 Dielectric strength test . 108
D.4 Performance of the test device . 108
Annex E (informative) Methods for determination of short-circuit power-factor . 109
E.1 General . 109
E.2 Method I – Determination from DC components . 109
E.3 Method II – Determination with pilot generator . 110
Annex F (informative) Co-ordination under short-circuit conditions between an RCBO
and another short-circuit protective device (SCPD) associated in the same circuit . 111
F.1 General . 111

– 6 – IEC 61009-1:2024 © IEC 2024
F.2 Overview. 112
F.3 General requirements for the co-ordination of an RCBO with another SCPD . 112
F.3.1 General consideration . 112
F.3.2 Take-over current . 112
F.3.3 Behaviour of C in association with another SCPD . 112
F.4 Type and characteristics of the associated SCPD . 112
F.5 Verification of selectivity . 113
F.6 Verification of back-up protection . 113
F.6.1 Determination of the take-over current . 113
F.6.2 Verification of back-up protection . 114
F.6.3 Tests for verification of back-up protection . 114
F.6.4 Results to be obtained . 115
Annex G (normative) Additional requirements and tests for RCBOs consisting of a
circuit-breaker and a residual current unit designed for assembly on site . 119
G.1 General . 119
G.2 Marking and other product information . 119
G.2.1 Manufacturer's name or trade mark . 119
G.2.2 Marking . 119
G.2.3 Instructions for assembly and operation . 120
G.3 Constructional requirements . 120
G.3.1 General . 120
G.3.2 Degree of protection . 120
G.3.3 Mechanical requirements . 121
G.3.4 Electrical compatibility . 121
G.4 Type tests and verifications . 121
G.4.1 Tests on circuit-breakers . 121
G.4.2 Tests on RC units . 121
G.4.3 Tests on assembled circuit-breaker and RC unit (RCBO) . 121
G.4.4 Verification of marking and constructional requirements of RCBOs . 121
G.5 Routine tests on the RC unit . 122
Annex H (informative) Examples of terminal designs . 123
Annex I (informative) Correspondence between ISO and AWG copper conductors . 126
Annex J (informative) Follow-up testing program for RCBOs . 127
J.1 General . 127
J.2 Follow-up testing program . 127
J.2.1 General . 127
J.2.2 Quarterly follow-up testing program . 127
J.2.3 Annual follow-up testing program . 127
J.2.4 Sampling procedure . 128
Bibliography . 131

Figure 1 – Standard test finger . 81
Figure 2 – Void . 82
Figure 3 – Void . 82
Figure 4 – Void . 82
Figure 5 – Typical diagram for all short circuit tests except for the verification of the
suitability in IT systems . 83
Figure 6 – Typical diagram for the verification of the suitability in IT systems . 84

Figure 7 – Detail of impedances Z, Z and Z . 84
1 2
Figure 8 – Mechanical shock test apparatus . 85
Figure 9 – Mechanical impact test apparatus . 86
Figure 10 – Striking element for pendulum impact test apparatus. 87
Figure 11 – Mounting support for sample for mechanical impact test. 88
Figure 12 – Example of mounting an unenclosed or flush-type RCBO for mechanical
impact test . 89
Figure 13 – Example of mounting of panel mounting type RCBO for the mechanical
impact test . 90
Figure 14 – Application of force for mechanical test of rail mounted RCBO . 91
Figure 15 – Ball-pressure test apparatus. 91
Figure 16 – Current ring wave 0,5 µs/100 kHz . 92
Figure 17 – Test circuit for the ring wave test on RCBOs . 92
Figure 18 – Surge current impulse 8/20 µs . 93
Figure 19 – Test circuit for the surge current test of RCBOs . 93
Figure 20 – Stabilizing period for reliability test . 94
Figure 21 – Reliability test cycle . 95
Figure 22 – Void . 95
Figure 23 – Example of records for short-circuit tests . 96
Figure 24 – Test circuit for the verification of the behaviour under temporary over
voltage (TOV) conditions for RCBOs with a terminal intended to be connected
to the PE . 97
Figure 25 – Void . 97
Figure 26 – Void . 97
Figure 27 – Diagrammatic representation for glow-wire test . 98
Figure B.1 – Measuring creepage distances and clearances: Example 1 . 101
Figure B.2 – Measuring creepage distances and clearances: Example 2 . 101
Figure B.3 – Measuring creepage distances and clearances: Example 3 . 101
Figure B.4 – Measuring creepage distances and clearances: Example 4 . 102
Figure B.5 – Measuring creepage distances and clearances: Example 5 . 102
Figure B.6 – Measuring creepage distances and clearances: Example 6 . 102
Figure B.7 – Measuring creepage distances and clearances: Example 7 . 103
Figure B.8 – Measuring creepage distances and clearances: Example 8 . 103
Figure B.9 – Measuring creepage distances and clearances: Example 9 . 103
Figure B.10 – Measuring creepage distances and clearances: Example 10 . 104
Figure B.11 – Measuring creepage distances and clearances: Example 11 . 104
Figure C.1 – Example of test arrangement . 106
Figure C.2 – Grid . 107
Figure C.3 – Grid circuit . 107
Figure F.1 – Overcurrent co-ordination between an RCBO and a fuse or back-up
protection by a fuse – Operating characteristics . 116
Figure F.2 – Total selectivity . 117
Figure F.3 – Back-up protection – Operating characteristics . 118
Figure H.1 – Examples of pillar terminals . 123

– 8 – IEC 61009-1:2024 © IEC 2024
Figure H.2 – Examples of screw terminals and stud terminals . 124
Figure H.3 – Examples of saddle terminals . 125
Figure H.4 – Examples of lug terminals . 125

Table 1 – Marking . 69
Table 2 – Void . 70
Table 3 – Void . 70
Table 4 – Void . 70
Table 5 – Void . 70
Table 6 – Void . 70
Table 7 – Void . 70
Table 8 – Void . 70
Table 9 – Void . 70
Table 10 – Void . 70
Table 11 – Standard limit values of break time and non-actuating time for alternating
residual currents (RMS values) for type AC and A . 70
Table 12 – Standard maximum values of break time for half-wave residual currents

(RMS values) for type A . 70
Table 13 – Void . 71
Table 14 – Tripping current limits . 71
Table 15 – Void . 71
Table 16 – Void . 71
Table 17 – Void . 71
Table 18 – Void . 71
Table 19 – Rated impulse withstand voltage as a function of the nominal voltage of the
installation . 71
Table 20 – Minimum clearances and creepage distances . 72
Table 21 – Test voltage of auxiliary circuits . 73
Table 22 – Test voltage for verification of rated impulse withstand voltage. 73
Table 23 – Test voltage for verifying the suitability for isolation, with reference to the rated
impulse withstand voltage of the RCBO and the altitude where the test is carried out . 74
Table 24 – Connectable cross-sections of copper conductors for screw-type terminals . 74
Table 25 – Test copper conductors corresponding to the rated currents . 74
Table 26 – Screw thread diameters and applied torques . 75
Table 27 – Pulling forces . 75
Table 28 – Temperature-rise values . 75
Table 29 – Power factor ranges of the test circuit . 76
Table 30 – Withstand values and duration of temporary overvoltages . 76
Table 31 – Void . 76
Table 32 – Void . 76
Table 33 – Void . 76
Table 34 – Void . 76
Table 35 – Void . 76
Table 36 – Void . 76

Table 37 – Standard values of rated short circuit capacity. 76
Table 38 – Ranges of overcurrent instantaneous tripping . 77
Table 39 – Time-current operating characteristics . 77
Table 40 – List of short-circuit tests . 77
Table 41 – Ratio between service short-circuit capacity (I ) and rated short-circuit
cs
capacity (I ) – (factor k) . 78
cn
Table 42 – Test procedure for I in the case of single- and two-pole RCBOs . 78
cs
Table 43 – Test procedure for I in the case of three- and four-pole RCBOs . 78
cs
Table 44 – Test procedure for I . 78
cn
Table 45 – Void . 78
Table 46 – Standard values of rated operational voltage . 79
Table 47 – Values of influencing quantities . 80
Table J.1 – Test sequences during follow-up inspections . 128
Table J.2 – Number of samples to be tested . 130

– 10 – IEC 61009-1:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS
WITH INTEGRAL OVERCURRENT PROTECTION
FOR HOUSEHOLD AND SIMILAR USES (RCBOs) –

Part 1: General rules
FOREWORD
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