oSIST prEN IEC 61009-1:2026
(Main)Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules (IEC 61009-1:2024)
- Abstract
This document 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.
RCBOs are intended to provide fault protection (previously referred to as protection against
indirect contact), the exposed conductive parts of the installation being connected to an
appropriate earth electrode. These devices are also intended to protect against overcurrents in
the wiring installations of buildings and similar applications. They are also intended to be used
to provide protection against fire hazards due to a persistent earth fault current.
RCBOs having a rated residual operating current not exceeding 30 mA are used for fault
protection and additional protection in the case of failure of the protective provisions against
electric shock.
This document applies to RCBOs performing simultaneously the functions of detection of the
residual current, of comparison of the value of this current with the residual operating value and
of opening of the protected circuit when the residual current exceeds this value. These devices
also perform the function of making, carrying and breaking overcurrents under specified
conditions.
RCBOs are intended to be operated by ordinary or uninstructed persons and designed not to
require maintenance.
The requirements of this document apply for standard conditions (see 7.1). Additional
requirements can be necessary for RCBOs used in locations which have severe environmental
conditions. RCBOs within the scope of this document are intended for use in an environment
with pollution degree 2 (see 7.3).
RCBOs are suitable for isolation.
Special precautions (e.g. surge protective devices) can be necessary when excessive
overvoltages are likely to occur on the supply side (for example in the case of supply through
overhead lines, see IEC 60364-4-44 and IEC 60364-5-53).
RCBOs, with the exception of those with an uninterrupted neutral, are suitable for use in IT
systems.
RCBOs of the general type are resistant to current surges, including the case where surge
voltages (as a result of switching transients or induced by lightning) cause loading currents in
the installation without occurrence of flashover.
RCBOs of type S are considered to be sufficiently resistant against unwanted tripping even if
the surge voltage causes a flashover and a follow-on current occurs.
This document also applies to RCBOs obtained by the assembly of an adaptable residual
current device with a circuit-breaker. The mechanical assembly is intended to be effected in the
factory by the manufacturer, or on site, in which case the requirements of Annex G apply. It
also applies to RCBOs having more than one rated current, provided that the means for
changing from one discrete rating to another is not accessible in normal service and that the
rating cannot be changed without the use of a tool.
Particular requirements are necessary for RCBOs intended to be used at frequencies other than
50 Hz or 60 Hz.
For RCBOs incorporated in, or intended for association with socket-outlets only, the
requirements of this document can be used, as far as applicable, in conjunction with the
requirements of IEC 60884-1 or the national requirements of the country where the product is
placed on the market.
This document does not apply to:
.........
- Status
- Not Published
- Public Enquiry End Date
- 27-Feb-2026
- Technical Committee
- EPR - Electrical accessories
- Current Stage
- 4020 - Public enquire (PE) (Adopted Project)
- Start Date
- 18-Dec-2025
- Due Date
- 07-May-2026
- Completion Date
- 10-Apr-2026
oSIST prEN IEC 61009-1:2026 is a draft European Standard published through SIST and based on IEC 61009-1:2024. It specifies general rules and tests for residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs), so manufacturers, test laboratories, certification bodies and specifiers can check the same device type against the same safety and performance framework.
What does oSIST prEN IEC 61009-1:2026 specify?
oSIST prEN IEC 61009-1:2026 sets the general requirements, classifications, markings, construction rules and type tests for RCBOs used in household and similar installations. The document covers devices up to 440 V AC, up to 125 A, and up to 25 000 A short-circuit capacity, and it is intended for ordinary or uninstructed persons and for use without maintenance.
The scope includes fault protection, overcurrent protection and protection against fire hazards due to persistent earth fault current. It also covers RCBOs with a rated residual operating current not exceeding 30 mA for fault protection and additional protection against electric shock.
The document is organized into clauses 1 to 9, with annexes A to J for test sequences, measurement methods, coordination guidance and other supporting material.
| Annex | What it covers |
|---|---|
| A | Test sequence and number of samples for certification purposes |
| B | Determination of clearances and creepage distances |
| C | Arrangement for detecting the emission of ionized gases during short-circuit tests |
| D | Routine tests carried out by the manufacturer |
| E | Methods for determining short-circuit power-factor |
| F | Coordination under short-circuit conditions between an RCBO and another SCPD in the same circuit |
| G | RCBOs assembled from a circuit-breaker and an RC unit on site |
| H | Examples of terminal designs |
| I | Correspondence between ISO and AWG copper conductors |
| J | Follow-up testing program for RCBOs |
The scope excludes RCBOs intended to protect motors, RCBOs with a current setting adjustable without a tool, and RCBOs including batteries. It also notes special cases for frequencies other than 50 Hz or 60 Hz, use in IT systems, and use with socket-outlets.
What are the key requirements of oSIST prEN IEC 61009-1:2026?
Rating, classification and application
oSIST prEN IEC 61009-1:2026 requires RCBOs to be classified so that the correct device can be selected for the installation and the correct tests can be applied. Clause 4 groups RCBOs by supply conditions, residual current setting, residual current type, time-delay, protection against external influences, mounting, connection method, terminal type, number of poles and current paths, instantaneous tripping type, and I t characteristic.
In practice, this matters because two RCBOs can look similar but be intended for different supply arrangements, different residual current waveforms, or different selectivity behavior. The document also distinguishes general-use devices from type S devices, which are intended to reduce unwanted tripping.
Rated characteristics and nameplate data
Clause 5 requires the key electrical characteristics to be stated, including rated voltages, rated current, rated frequency, rated short-circuit capacity, rated residual operating current, rated residual non-operating current, rated residual making and breaking capacity, time-delay if used, response to residual current with DC components, degree of protection, and the range of overcurrent instantaneous tripping.
For a buyer or engineer, this is the information needed to match the RCBO to the circuit and to compare products from different manufacturers. Clause 5 also ties the declared characteristics to standard and preferred values, so product data sheets and markings should line up with the device family covered by this document.
Marking and product information
Clause 6 requires durable marking and visible indication of the open and closed positions. It also allows the isolation symbol to indicate suitability for isolation, and it sets marking rules for protective conductor terminals and for terminal types such as universal, rigid-solid, rigid stranded and flexible conductor terminals.
This matters during installation and inspection because the markings must remain legible after handling and service. The clause also requires that any higher degree of protection than IP20 be true for the stated method of installation or be explained in the product information.
Service conditions and installation assumptions
Clause 7 places RCBOs in standard operating conditions and in pollution degree 2 environments, with installation according to the manufacturer’s instructions. That means the device is assessed for normal indoor contamination where only occasional temporary conductivity from condensation is expected.
In practice, this clause tells specifiers when extra enclosure protection or special constructions may be needed. It also sets the environmental assumptions used for the tests in Clause 9.
Construction, safety and functional performance
Clause 8 covers the construction and operating features that keep the RCBO safe in normal use and under fault conditions. It includes mechanical design, clearances, creepage distances, solid insulation, screws and connections, terminals for external conductors, protection against electric shock, dielectric properties, temperature-rise, operating characteristics, endurance, short-circuit performance, shock and impact resistance, heat and fire resistance, the test device, resistance to surge currents, reliability, EMC and resistance to temporary overvoltages (TOV).
This is where the practical safety expectations are set. For example, live parts must not be accessible when the RCBO is mounted and wired as intended, terminals must clamp conductors reliably, and the test device must simulate residual current without becoming the sole opening means.
Testing, production control and coordination
Clause 9 requires type tests for design verification and refers routine tests to Annex D. It also points to the classification-dependent test sequences in IEC 61009-2-1:2024 or IEC 61009-2-2:2024, and it gives the detailed tests for marking, screws, terminals, electric shock protection, dielectric strength, temperature-rise, operating characteristics, endurance, short-circuit behavior, surge behavior, ageing, rusting, EMC and TOV.
Annex F gives guidance on coordination with another short-circuit protective device in the same circuit, including selectivity and back-up protection. Annex G applies when the RCBO is assembled on site from a circuit-breaker and an RC unit, so the requirements still cover the finished assembly.
What terms does oSIST prEN IEC 61009-1:2026 define?
- Live part - A conductive part intended to be energized in normal operation, including the neutral conductor and mid-point conductor, but excluding PEN, PEM and PEL conductors.
- Functional earth (FE) - A wire or terminal intended to connect to PE so the RCBO can continue to be supplied when it is fed from one phase only.
- Line to neutral voltage (U) - The voltage between a line conductor and the neutral conductor.
- Residual current unit (RC-unit) - A device that detects residual current, compares it with the residual operating value, and operates the tripping mechanism of the circuit-breaker it is meant to be assembled with.
Who uses oSIST prEN IEC 61009-1:2026?
Manufacturers use oSIST prEN IEC 61009-1:2026 to design RCBOs, declare ratings, choose classifications and plan type and routine testing. Test laboratories and certification bodies use it to verify performance, safety, endurance and fault behavior in a consistent way.
Electrical designers, panel builders, installers and procurement teams use it to specify the correct RCBO for household and similar wiring systems, including the right residual current type, tripping behavior, terminal type and short-circuit capability. It is also relevant when an RCBO must work with another SCPD or when a residual current function is built into a device assembled on site.
What changed in oSIST prEN IEC 61009-1:2026 from the previous edition?
oSIST prEN IEC 61009-1:2026 supersedes EN 61009-1:2012 and its amendments and corrigenda.
Which standards are used with oSIST prEN IEC 61009-1:2026?
- IEC 61009-2-1:2024 and IEC 61009-2-2:2024 - Provide the test sequences and sample numbers for certification, and the classification-dependent verification procedures.
- IEC 62873-2 - Supplies the vocabulary for residual current devices used by the document.
- IEC 62873-3-1, IEC 62873-3-2 and IEC 62873-3-3 - Add terminal-related requirements for specific conductor and termination types.
- IEC 60898-1 and IEC 60947-2 - Provide the circuit-breaker context used for coordination, short-circuit breaking capacity and related comparisons.
- IEC 60228 - Defines conductor construction and sizes used when terminals are tested.
- IEC 60529 - Provides the IP Code used for degrees of protection.
- IEC 60664-1 and IEC 60664-3 - Support insulation coordination, clearances, creepage distances and pollution-related protection.
- IEC 60060-2 - Supports high-voltage measuring systems used in dielectric tests.
- IEC 60068-2-30 and IEC 60068-3-4 - Support damp-heat environmental testing.
- IEC 60695-2-10 - Provides the glow-wire apparatus and procedure used for fire-resistance testing.
- IEC 61032 - Defines the probes used to verify accessibility and protection against electric shock.
- IEC 60417 - Provides the graphical symbols used for marking.
- IEC 60884-1 - Is noted in the scope for RCBOs associated only with socket-outlets.
What does the oSIST prEN IEC 61009-1:2026 document contain?
The document contains classification rules, rating and marking requirements, construction checks, and detailed type-test methods for electrical, mechanical, thermal, environmental and EMC behavior. It also includes tables for standard values, test limits and coordination data, plus figures for test fingers, short-circuit circuits, impact rigs, surge test set-ups and glow-wire arrangements.
Annex B gives the measurement rules for creepage distances and clearances, Annex E gives formulas and methods for short-circuit power-factor, and Annex F explains how to assess an RCBO working with another SCPD. Annex D and Annex J support production testing and follow-up quality control, so the document is useful not only for design approval but also for routine manufacturing control.
Relations
- Effective Date
- 03-Feb-2026
- Effective Date
- 22-Jul-2025
- Effective Date
- 02-Dec-2025
- Effective Date
- 02-Dec-2025
- Effective Date
- 02-Dec-2025
- Effective Date
- 02-Dec-2025
- Effective Date
- 02-Dec-2025
- Effective Date
- 02-Dec-2025
Get Certified
Connect with accredited certification bodies for this standard
IMQ S.p.A. (Certification)
Italian electrical product certification.
SLG Prüf- und Zertifizierungs GmbH
German testing and certification body.
UL Solutions
Global safety science company with testing, inspection and certification.
Sponsored listings
Frequently Asked Questions
oSIST prEN IEC 61009-1:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules (IEC 61009-1:2024)". This standard covers: This document 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. RCBOs are intended to provide fault protection (previously referred to as protection against indirect contact), the exposed conductive parts of the installation being connected to an appropriate earth electrode. These devices are also intended to protect against overcurrents in the wiring installations of buildings and similar applications. They are also intended to be used to provide protection against fire hazards due to a persistent earth fault current. RCBOs having a rated residual operating current not exceeding 30 mA are used for fault protection and additional protection in the case of failure of the protective provisions against electric shock. This document applies to RCBOs performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating value and of opening of the protected circuit when the residual current exceeds this value. These devices also perform the function of making, carrying and breaking overcurrents under specified conditions. RCBOs are intended to be operated by ordinary or uninstructed persons and designed not to require maintenance. The requirements of this document apply for standard conditions (see 7.1). Additional requirements can be necessary for RCBOs used in locations which have severe environmental conditions. RCBOs within the scope of this document are intended for use in an environment with pollution degree 2 (see 7.3). RCBOs are suitable for isolation. Special precautions (e.g. surge protective devices) can be necessary when excessive overvoltages are likely to occur on the supply side (for example in the case of supply through overhead lines, see IEC 60364-4-44 and IEC 60364-5-53). RCBOs, with the exception of those with an uninterrupted neutral, are suitable for use in IT systems. RCBOs of the general type are resistant to current surges, including the case where surge voltages (as a result of switching transients or induced by lightning) cause loading currents in the installation without occurrence of flashover. RCBOs of type S are considered to be sufficiently resistant against unwanted tripping even if the surge voltage causes a flashover and a follow-on current occurs. This document also applies to RCBOs obtained by the assembly of an adaptable residual current device with a circuit-breaker. The mechanical assembly is intended to be effected in the factory by the manufacturer, or on site, in which case the requirements of Annex G apply. It also applies to RCBOs having more than one rated current, provided that the means for changing from one discrete rating to another is not accessible in normal service and that the rating cannot be changed without the use of a tool. Particular requirements are necessary for RCBOs intended to be used at frequencies other than 50 Hz or 60 Hz. For RCBOs incorporated in, or intended for association with socket-outlets only, the requirements of this document can be used, as far as applicable, in conjunction with the requirements of IEC 60884-1 or the national requirements of the country where the product is placed on the market. This document does not apply to: .........
This document 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. RCBOs are intended to provide fault protection (previously referred to as protection against indirect contact), the exposed conductive parts of the installation being connected to an appropriate earth electrode. These devices are also intended to protect against overcurrents in the wiring installations of buildings and similar applications. They are also intended to be used to provide protection against fire hazards due to a persistent earth fault current. RCBOs having a rated residual operating current not exceeding 30 mA are used for fault protection and additional protection in the case of failure of the protective provisions against electric shock. This document applies to RCBOs performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating value and of opening of the protected circuit when the residual current exceeds this value. These devices also perform the function of making, carrying and breaking overcurrents under specified conditions. RCBOs are intended to be operated by ordinary or uninstructed persons and designed not to require maintenance. The requirements of this document apply for standard conditions (see 7.1). Additional requirements can be necessary for RCBOs used in locations which have severe environmental conditions. RCBOs within the scope of this document are intended for use in an environment with pollution degree 2 (see 7.3). RCBOs are suitable for isolation. Special precautions (e.g. surge protective devices) can be necessary when excessive overvoltages are likely to occur on the supply side (for example in the case of supply through overhead lines, see IEC 60364-4-44 and IEC 60364-5-53). RCBOs, with the exception of those with an uninterrupted neutral, are suitable for use in IT systems. RCBOs of the general type are resistant to current surges, including the case where surge voltages (as a result of switching transients or induced by lightning) cause loading currents in the installation without occurrence of flashover. RCBOs of type S are considered to be sufficiently resistant against unwanted tripping even if the surge voltage causes a flashover and a follow-on current occurs. This document also applies to RCBOs obtained by the assembly of an adaptable residual current device with a circuit-breaker. The mechanical assembly is intended to be effected in the factory by the manufacturer, or on site, in which case the requirements of Annex G apply. It also applies to RCBOs having more than one rated current, provided that the means for changing from one discrete rating to another is not accessible in normal service and that the rating cannot be changed without the use of a tool. Particular requirements are necessary for RCBOs intended to be used at frequencies other than 50 Hz or 60 Hz. For RCBOs incorporated in, or intended for association with socket-outlets only, the requirements of this document can be used, as far as applicable, in conjunction with the requirements of IEC 60884-1 or the national requirements of the country where the product is placed on the market. This document does not apply to: .........
oSIST prEN IEC 61009-1:2026 is classified under the following ICS (International Classification for Standards) categories: 29.120.50 - Fuses and other overcurrent protection devices. The ICS classification helps identify the subject area and facilitates finding related standards.
oSIST prEN IEC 61009-1:2026 has the following relationships with other standards: It is inter standard links to SIST EN IEC 62840-2:2025, oSIST prEN IEC 61009-1:2026/oprAA:2026, SIST EN 61009-1:2013/A13:2022, SIST EN 61009-1:2013, SIST EN 61009-1:2013/A11:2015, SIST EN 61009-1:2013/A12:2016, SIST EN 61009-1:2013/A1:2014, SIST EN 61009-1:2013/A2:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
oSIST prEN IEC 61009-1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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
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
...