oSIST prEN IEC 61009-1:2026

SLOVENSKI STANDARD
01-februar-2026
Odklopniki na preostali (residualni) tok z vgrajeno nadtokovno zaščito za
gospodinjsko in podobno rabo (RCBO) - 1. del: Splošna pravila (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)
Fehlerstrom-/Differenzstrom-Schutzschalter mit eingebautem Überstromschutz (RCBOs)
für Hausinstallationen und für ähnliche Anwendungen - Teil 1: Allgemeine
Anforderungen (IEC 61009-1:2024)
Ta slovenski standard je istoveten z: prEN IEC 61009-1:2026
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN IEC 61009-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 29.120.50 Will supersede EN 61009-1:2012; EN 61009-
1:2012/A1:2014; EN 61009-1:2012/A2:2014; EN 61009-
1:2012/A11:2015; EN 61009-1:2012/A12:2016; EN 61009-
1:2012/A13:2021
English Version
Residual current operated circuit-breakers with integral
overcurrent protection for household and similar uses (RCBOs) -
Part 1: General rules
(IEC 61009-1:2024)
To be completed Fehlerstrom-/Differenzstrom-Schutzschalter mit
(IEC 61009-1:2024) eingebautem Überstromschutz (RCBOs) für
Hausinstallationen und für ähnliche Anwendungen - Teil 1:
Allgemeine Anforderungen
(IEC 61009-1:2024)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2026-04-24.
The text of this draft consists of the text of IEC 61009-1:2024.
If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 82329 Ref. No. prEN IEC 61009-1:2026 E

European foreword
This document (prEN IEC 61009-1:2026) consists of the text of IEC 61009-1:2024, prepared by IEC/SC
23E “Circuit-breakers and similar equipment for household use” of IEC/TC 23 “Electrical accessories”.
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this document (doa) dav + 6 months
has to be announced at national level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) dav + 60 months
conflicting with this document have to be withdrawn (to be confirmed or
modified when voting)
This document will supersede EN 61009-1:2012 and all of its amendments and corrigenda (if any).
This document is read in conjunction with prEN IEC 61009-1:2026/prAA:2026.

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
IEC 61009-1:2024 © IEC 2024 – 3 –
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

IEC 61009-1:2024 © IEC 2024 – 5 –
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

IEC 61009-1:2024 © IEC 2024 – 7 –
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

IEC 61009-1:2024 © IEC 2024 – 9 –
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 qu
...