oSIST prEN IEC 61008-1:2026
(Main)Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) - Part 1: General rules (IEC 61008-1:2024)
- Abstract
This document gives general requirements and tests for residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (hereafter referred to as RCCBs), 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, intended principally for protection against shock hazard.
RCCBs 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. They are also intended to be used to provide protection against fire hazards due to a persistent earth fault current.
RCCBs 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 RCCBs 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.
RCCBs 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 RCCBs used in locations which have severe environmental conditions. RCCBs within the scope of this document are intended for use in an environment with pollution degree 2 (see 7.3).
RCCBs 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).
RCCBs, with the exception of those with an uninterrupted neutral, are suitable for use in IT systems.
RCCBs 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.
RCCBs 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.
Particular requirements are necessary for RCCBs intended to be used at frequencies other than 50 Hz or 60 Hz.
For RCCBs 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:
– RCCBs the current setting of which is adjustable without a tool;
– RCCBs including batteries.
This document is not intended to be used alone; it is intended to be used in conjunction with the relevant product standard, IEC 61008-2-1 or IEC 61008-2-2.
- 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 61008-1:2026 is a draft European Standard published by SIST for residual current operated circuit-breakers without integral overcurrent protection, or RCCBs. It gives the general rules and tests for RCCBs used in household and similar installations, mainly for protection against electric shock, fault protection and fire hazards from persistent earth fault current. It is written for manufacturers, test laboratories, certification bodies and buyers who need to select, mark, install or verify these devices.
What does oSIST prEN IEC 61008-1:2026 specify?
oSIST prEN IEC 61008-1:2026 specifies general requirements and tests for RCCBs with rated operational voltages up to 440 V AC, rated frequencies of 50 Hz, 60 Hz or 50/60 Hz, and rated currents up to 125 A. The document also sets the conditions for use, classification, construction, marking and testing, so readers can see what a compliant RCCB is expected to do in service and in verification.
The scope is focused on devices that detect residual current, compare it with the residual operating value and open the protected circuit when that value is exceeded. RCCBs are intended for operation by ordinary or uninstructed persons and are designed not to require maintenance.
The document does not cover RCCBs with a current setting adjustable without a tool or RCCBs including batteries. It is not intended to be used alone; it is intended to be used with IEC 61008-2-1 or IEC 61008-2-2, and for socket-outlet applications it can be used together with IEC 60884-1 or the national rules of the country where the product is marketed.
| Annex | What it covers |
|---|---|
| Annex A | Test sequence and number of samples for certification purposes |
| Annex B | Determination of clearances and creepage distances |
| Annex C | Arrangement for detecting ionized gases during short-circuit tests |
| Annex D | Routine tests |
| Annex E | Methods for determining short-circuit power-factor |
| Annex H | Examples of terminal designs |
| Annex I | Correspondence between ISO and AWG copper conductors |
| Annex J | Follow-up testing program for RCCBs |
| Annex K | Verification of minimum I²t and peak current withstand values |
What are the key requirements of oSIST prEN IEC 61008-1:2026?
oSIST prEN IEC 61008-1:2026 is built around a clear chain: classify the RCCB, state its ratings, mark it correctly, build it to withstand normal and fault conditions, then verify it by type tests and routine tests. In practice, this means the document is both a product definition and a test basis.
- Clause 4 classifies RCCBs by supply condition, residual current response, time-delay, enclosure, mounting, connection, terminal type and number of poles/current paths. This matters because the class determines which device variant is being specified and which companion tests apply.
- Clause 5 defines the rated quantities and other characteristics that have to be stated, including rated operational voltage, rated current, frequency, making and breaking capacity, residual operating and non-operating currents, and short-circuit ratings. The manufacturer also has to state the Joule integral I²t and peak current withstand capability, or the minimum values apply. For a buyer or engineer, this is the main section for checking whether the RCCB fits the electrical system.
- Clause 5 also gives standard and preferred values for voltage, current, residual operating current, frequency, impulse withstand voltage and timing limits. This supports selection and comparison, so users do not have to invent their own product ratings.
- Clause 6 covers marking and product information. The device has to be marked durably, the isolation function may be indicated with the relevant symbol, and the manufacturer has to identify the suitable short-circuit protective device(s) and the withstand values. This is what installers and inspectors use to verify identity, orientation, terminals and coordination on site.
- Clause 7 fixes the service conditions. The standard conditions apply, installation has to follow the manufacturer’s instructions, and the intended environment is pollution degree 2. The document also notes suitability for isolation and suitability for IT systems except devices with an uninterrupted neutral.
- Clause 8 sets the construction and performance requirements. It covers mechanical design, clearances, creepage distances, solid insulation, electric shock protection, dielectric properties, temperature-rise, operating characteristics, endurance, short-circuit performance, shock and impact, heat, abnormal heat and fire, the test device, surge behaviour, reliability, EMC and temporary overvoltage withstand. In practice, this is the part that tells the manufacturer what the RCCB must survive before it is accepted.
- Clause 8.7 requires coordination with an SCPD. The short-circuit protective device is selected using the RCCB’s let-through I²t and peak current values, so the RCCB is protected from short-circuit stress by a circuit-breaker or fuse matched to its ratings.
- Clause 9 defines the verification route. The standard relies on type tests, with test sequences provided by IEC 61008-2-1 or IEC 61008-2-2 as relevant. Annex D adds routine tests for every device, and Annex J gives an example follow-up testing program for production control.
What terms does oSIST prEN IEC 61008-1:2026 define?
oSIST prEN IEC 61008-1:2026 uses a small set of core terms that matter for design and testing.
- RCCB - a residual current operated circuit-breaker without integral overcurrent protection, which detects residual current and opens the circuit when the residual operating value is exceeded.
- Functional earth (FE) - a wire or terminal intended to be connected to PE so the RCCB can keep its supply when it is fed from one phase only.
- Live part - a conductive part intended to be energized in normal operation, including the neutral and mid-point conductor, but excluding PEN, PEM and PEL conductors.
- Line to neutral voltage - the voltage between the line conductor and the neutral conductor.
- Residual operating current IΔn - the residual current level used as the reference for tripping performance and test limits.
- Short-circuit protective device (SCPD) - the circuit-breaker or fuse used with the RCCB to limit short-circuit stress and provide coordination.
Who uses oSIST prEN IEC 61008-1:2026?
oSIST prEN IEC 61008-1:2026 is used by manufacturers of RCCBs, including teams responsible for design, safety engineering, marking and production control. It is also used by test laboratories and certification bodies that run type tests, routine tests and follow-up testing programs.
Quality managers use it to check that production devices still match the tested sample, especially for marking, terminals, dielectric performance and tripping behavior. Installers, panel builders and buyers use it to choose the right class of RCCB, the right pole arrangement, the right mounting style and the right coordination with an SCPD.
The document is relevant in household and similar low-voltage electrical equipment, especially where RCCBs are used for shock protection, fault protection, fire protection and isolation.
What changed in oSIST prEN IEC 61008-1:2026 from the previous edition?
oSIST prEN IEC 61008-1:2026 will supersede EN 61008-1:2012 and its listed amendments and corrigenda. The draft text is based on IEC 61008-1:2024.
Which standards are used with oSIST prEN IEC 61008-1:2026?
oSIST prEN IEC 61008-1:2026 is used with a set of IEC standards that provide vocabulary, test methods, terminal requirements and installation guidance.
- prEN IEC 61008-1:2026/prAA:2026 - the foreword says this draft is read together with it.
- IEC 61008-2-1:2024 and IEC 61008-2-2:2024 - companion parts that provide the test sequences, sample numbers and several operating tests for the relevant RCCB classifications.
- IEC 62873-2 - vocabulary for residual current devices.
- IEC 62873-3-1, IEC 62873-3-2 and IEC 62873-3-3 - particular requirements for screwless copper terminals, flat quick-connect terminations and aluminium terminals.
- IEC 60060-2 - measuring systems for high-voltage tests.
- IEC 60068-2-30 and IEC 60068-3-4 - damp-heat testing and related guidance for reliability checks.
- IEC 60228 - conductor sizes and properties used for terminal and connection testing.
- IEC 60417 - graphical symbols used for device marking.
- IEC 60529 - IP Code for degrees of protection.
- IEC 60664-1 and IEC 60664-3 - insulation coordination, creepage and clearance principles, and pollution protection.
- IEC 60695-2-10 - glow-wire apparatus and procedure for fire testing.
- IEC 61032 - probes used to verify protection against electric shock.
- IEC 60755 - general safety requirements for residual current operated protective devices.
- IEC 60884-1 - used when the RCCB is incorporated in or associated only with socket-outlets.
- IEC 60364-4-44 and IEC 60364-5-53 - installation guidance and precautions for supply-side overvoltage conditions.
What does the oSIST prEN IEC 61008-1:2026 document contain?
The document contains the full chain from scope and references through definitions, classification, characteristics, marking, installation conditions, construction requirements and test methods. It also includes detailed tables for ratings, timing limits, impulse withstand voltage, clearances, conductor cross-sections, torques, pulling forces, temperature-rise, power factor ranges, temporary overvoltages and short-circuit coordination.
The figures show the standard test finger, short-circuit test circuits, mechanical shock and impact rigs, ball-pressure apparatus, ring-wave and surge test circuits, and the arrangement for temporary overvoltage testing. Annex B gives worked examples for measuring creepage distances and clearances, so designers can check insulation geometry.
Annex C describes how to detect ionized gases during short-circuit tests. Annex D gives the routine tests for each manufactured device, Annex E gives two methods for determining short-circuit power-factor, Annex H shows common terminal designs, Annex I maps ISO to AWG copper conductors, Annex J gives a follow-up testing program, and Annex K explains how minimum I²t and peak current withstand values can be verified using silver wire, fuses or other means.
Relations
- Effective Date
- 07-Jul-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Refers
SIST EN 61032:2001 - Protection of persons and equipment by enclosures - Probes for verification - Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 22-Jul-2025
- Effective Date
- 25-Nov-2025
- Effective Date
- 25-Nov-2025
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Frequently Asked Questions
oSIST prEN IEC 61008-1:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) - Part 1: General rules (IEC 61008-1:2024)". This standard covers: This document gives general requirements and tests for residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (hereafter referred to as RCCBs), 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, intended principally for protection against shock hazard. RCCBs 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. They are also intended to be used to provide protection against fire hazards due to a persistent earth fault current. RCCBs 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 RCCBs 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. RCCBs 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 RCCBs used in locations which have severe environmental conditions. RCCBs within the scope of this document are intended for use in an environment with pollution degree 2 (see 7.3). RCCBs 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). RCCBs, with the exception of those with an uninterrupted neutral, are suitable for use in IT systems. RCCBs 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. RCCBs 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. Particular requirements are necessary for RCCBs intended to be used at frequencies other than 50 Hz or 60 Hz. For RCCBs 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: – RCCBs the current setting of which is adjustable without a tool; – RCCBs including batteries. This document is not intended to be used alone; it is intended to be used in conjunction with the relevant product standard, IEC 61008-2-1 or IEC 61008-2-2.
This document gives general requirements and tests for residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (hereafter referred to as RCCBs), 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, intended principally for protection against shock hazard. RCCBs 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. They are also intended to be used to provide protection against fire hazards due to a persistent earth fault current. RCCBs 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 RCCBs 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. RCCBs 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 RCCBs used in locations which have severe environmental conditions. RCCBs within the scope of this document are intended for use in an environment with pollution degree 2 (see 7.3). RCCBs 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). RCCBs, with the exception of those with an uninterrupted neutral, are suitable for use in IT systems. RCCBs 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. RCCBs 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. Particular requirements are necessary for RCCBs intended to be used at frequencies other than 50 Hz or 60 Hz. For RCCBs 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: – RCCBs the current setting of which is adjustable without a tool; – RCCBs including batteries. This document is not intended to be used alone; it is intended to be used in conjunction with the relevant product standard, IEC 61008-2-1 or IEC 61008-2-2.
oSIST prEN IEC 61008-1:2026 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 61008-1:2026 has the following relationships with other standards: It is inter standard links to SIST EN IEC 60695-2-10:2026, SIST EN IEC 60068-2-30:2025, SIST EN 60664-3:2017, SIST EN IEC 60228:2024, SIST EN 61032:2001, SIST EN 60417-2:2002, SIST EN IEC 60695-2-10:2022, SIST EN IEC 60060-2:2025, SIST EN IEC 60664-1:2020, SIST EN IEC 60068-3-4:2024, oSIST prEN IEC 61008-2-1:2026, SIST EN IEC 62840-2:2025, oSIST prEN IEC 61008-1:2026/oprAA:2026, SIST EN 61008-1:2013/A12:2017, SIST EN 61008-1:2013/A2:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
oSIST prEN IEC 61008-1:2026 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 brez vgrajene nadtokovne zaščite za
gospodinjsko in podobno rabo (RCCB) - 1. del: Splošna pravila (IEC 61008-1:2024)
Residual current operated circuit-breakers without integral overcurrent protection for
household and similar uses (RCCBs) - Part 1: General rules (IEC 61008-1:2024)
Fehlerstrom-/Differenzstrom-Schutzschalter ohne eingebauten Überstromschutz
(RCCBs) für Hausinstallationen und für ähnliche Anwendungen – Teil 1: Allgemeine
Anforderungen (IEC 61008-1:2024)
Interrupteurs automatiques à courant différentiel résiduel sans dispositif de protection
contre les surintensités incorporé pour usages domestiques et analogues (ID) - Partie 1:
Règles générales (IEC 61008-1:2024)
Ta slovenski standard je istoveten z: prEN IEC 61008-1:2026
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 61008-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 29.120.50 Will supersede EN 61008-1:2012; EN 61008-
1:2012/A1:2014; EN 61008-1:2012/A2:2014; EN 61008-
1:2012/A11:2015; EN 61008-1:2012/A1:2014/AC:2016-06;
EN 61008-1:2012/A12:2017
English Version
Residual current operated circuit-breakers without integral
overcurrent protection for household and similar uses (RCCBs) -
Part 1: General rules
(IEC 61008-1:2024)
Interrupteurs automatiques à courant différentiel résiduel Fehlerstrom-/Differenzstrom-Schutzschalter ohne
sans dispositif de protection contre les surintensités eingebauten Überstromschutz (RCCBs) für
incorporé pour usages domestiques et analogues (ID) - Hausinstallationen und für ähnliche Anwendungen - Teil 1:
Partie 1: Règles générales Allgemeine Anforderungen
(IEC 61008-1:2024) (IEC 61008-1:2024)
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2026-04-17.
The text of this draft consists of the text of IEC 61008-1:2024.
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: 82325 Ref. No. prEN IEC 61008-1:2026 E
prEN IEC 61008-1:2026 (E)
European foreword
This document (prEN IEC 61008-1:2026) consists of the text of IEC 61008-1:2024, 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 61008-1:2012 and all of its amendments and corrigenda (if any).
This document is read in conjunction with prEN IEC 61008-1:2026/prAA:2026.
IEC 61008-1 ®
Edition 4.0 2024-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) –
Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel sans dispositif de
protection contre les surintensités incorporé pour usages domestiques et
analogues (ID) –
Partie 1: Règles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8327-0007-5
– 2 – IEC 61008-1:2024 © IEC 2024
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 14
4 Classification . 15
4.1 According to the supply conditions . 15
4.1.1 RCCB operating correctly on the occurrence of residual current . 15
4.1.2 RCCB 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 . 15
e
4.1.3 RCCB 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 . 15
4.1.4 RCCB with 3 current paths operating correctly on the occurrence of
residual current within the voltage range of 1,1 U and 0,7 U . 15
e e
4.1.5 RCCB operating correctly on the occurrence of residual current within
the voltage range 1,1 U and U . 16
e x
4.1.6 RCCB according to 4.1.5, however reclosing automatically after
restoration of the supply voltage . 16
4.2 According to the possibility of adjusting the residual operating current . 16
4.2.1 RCCB with a single value of rated residual operating current . 16
4.2.2 RCCB with multiple settings of residual operating current by fixed steps . 16
4.3 According to their operation in response to the type of residual current . 16
4.3.1 RCCB of type AC . 16
4.3.2 RCCB of type A . 16
4.4 According to time-delay (in the presence of a residual current) . 16
4.4.1 RCCB without time-delay: type for general use . 16
4.4.2 RCCB with time-delay: type S for selectivity . 16
4.5 According to the protection against external influences . 16
4.5.1 Enclosed-type RCCB (not requiring an appropriate enclosure) . 16
4.5.2 Unenclosed-type RCCB (for use with an appropriate enclosure) . 16
4.6 According to the method of mounting . 16
4.6.1 Surface-type RCCB . 16
4.6.2 Flush-type RCCB . 16
4.6.3 Panel board type RCCB, also referred to as distribution board type . 16
4.7 According to the method of connection . 16
4.7.1 RCCB for which the electrical connections are not associated with the
mechanical mounting . 16
4.7.2 RCCB for which the electrical connections are associated with the
mechanical mounting . 16
4.8 According to the type of terminals . 17
4.8.1 RCCB with screw-type terminals for copper conductors . 17
4.8.2 RCCB with screwless type terminals for copper conductors . 17
4.8.3 RCCB with flat quick-connect terminals for copper conductors . 17
4.8.4 RCCB with screw-type terminals for aluminium conductors . 17
4.9 According to the number of poles and current paths . 17
4.9.1 Single-pole RCCB with two current paths . 17
4.9.2 Two-pole RCCB . 17
IEC 61008-1:2024 © IEC 2024 – 3 –
4.9.3 Three-pole RCCB . 17
4.9.4 Three-pole RCCB with four current paths . 17
4.9.5 Four-pole RCCB . 17
5 Characteristics of RCCBs . 17
5.1 Summary of characteristics . 17
5.2 Rated quantities and other characteristics . 18
5.2.1 Rated voltages . 18
5.2.2 Rated current (I ) . 18
n
5.2.3 Rated frequency . 18
5.2.4 Rated making and breaking capacity (I ) . 18
m
5.2.5 Rated residual operating current (I ) . 18
Δn
5.2.6 Rated residual non-operating current (I ) . 18
Δno
5.2.7 Rated residual making and breaking capacity (I ) . 18
Δm
5.2.8 Rated conditional short-circuit current (I ) . 19
nc
5.2.9 Rated conditional residual short-circuit current (I ) . 19
Δc
5.2.10 Operating characteristics in response to the type of residual current . 19
5.2.11 RCCB type S . 19
5.3 Standard and preferred values . 19
5.3.1 Standard values of rated operational voltage (U ) . 19
e
5.3.2 Preferred values of rated current (I ) . 19
n
5.3.3 Standard values of rated residual operating current (I ) . 19
Δn
5.3.4 Standard value of residual non-operating current (I ) . 20
Δno
5.3.5 Preferred values of rated frequency . 20
5.3.6 Standard values of rated impulse withstand voltage (U ) . 20
imp
5.3.7 Standard limit values of break time and non-actuating time for RCCB of
type AC and A . 20
5.3.8 Standard minimum value of non-operating overcurrent in the case of a
load through an RCCB with two current paths . 20
5.3.9 Standard minimum value of the non-operating overcurrent in the case of
a single-phase load through a three-pole or four-pole RCCB . 20
5.3.10 Standard minimum value of the rated making and breaking capacity
(I ) . 20
m
5.3.11 Standard minimum value of the rated residual making and breaking
capacity (I ) . 20
Δm
5.3.12 Standard and preferred values of the rated conditional short-circuit
current (I ). 21
nc
5.3.13 Standard values of the rated conditional residual short-circuit current
(I ) . 21
Δc
6 Marking and other product information . 21
7 Standard conditions for operation in service and for installation . 22
7.1 Standard conditions . 22
7.2 Conditions of installation . 22
7.3 Pollution degree . 22
8 Requirements for construction and operation . 23
8.1 Mechanical design . 23
8.1.1 General . 23
8.1.2 Mechanism . 23
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8.1.3 Clearances, creepage distances and solid insulation . 25
8.1.4 Screws, current-carrying parts and connections . 26
8.1.5 Terminals for external conductors . 27
8.2 Protection against electric shock . 28
8.3 Dielectric properties and isolating capability . 29
8.4 Temperature-rise . 29
8.4.1 General . 29
8.4.2 Temperature-rise limits . 29
8.4.3 Ambient air temperature . 30
8.5 Operating characteristics . 30
8.5.1 General . 30
8.5.2 Operation in response to the type of residual current . 30
8.5.3 Operation in presence of a residual current equal to or greater than I . 30
Δn
8.6 Mechanical and electrical endurance . 30
8.7 Performance at short-circuit currents . 31
8.8 Resistance to mechanical shock and impact . 31
8.9 Resistance to heat . 31
8.10 Resistance to abnormal heat and to fire . 31
8.11 Test device . 31
8.12 Void . 32
8.13 Behaviour of RCCBs in the event of overcurrent in the main circuit . 32
8.14 Behaviour of RCCBs in the event of current surges caused by impulse
voltages . 32
8.15 Reliability . 32
8.16 Electromagnetic compatibility (EMC) . 32
8.17 Resistance to temporary overvoltages (TOV) . 33
9 Tests . 33
9.1 General . 33
9.2 Test conditions . 33
9.3 Test of indelibility of marking . 34
9.4 Test of reliability of screws, current-carrying parts and connections . 34
9.5 Test of reliability of screw-type terminals for external copper conductors . 35
9.6 Verification of protection against electric shock . 36
9.7 Test of dielectric properties . 37
9.7.1 Resistance to humidity . 37
9.7.2 Insulation resistance of the main circuit . 38
9.7.3 Dielectric strength of the main circuit . 38
9.7.4 Insulation resistance and dielectric strength of auxiliary circuits. 39
9.7.5 Secondary circuit of detection transformers . 40
9.7.6 Capability of control circuits connected to the main circuit to withstand
high DC voltages due to insulation measurements . 40
9.7.7 Verification of impulse withstand voltages . 40
9.8 Test of temperature-rise . 42
9.8.1 Ambient air temperature . 42
9.8.2 Test procedure . 42
9.8.3 Measurement of the temperature of parts . 42
9.8.4 Temperature-rise of a part . 42
9.9 Verification of the operating characteristics . 42
9.10 Verification of mechanical and electrical endurance . 43
IEC 61008-1:2024 © IEC 2024 – 5 –
9.10.1 General test conditions . 43
9.10.2 Test procedure . 43
9.10.3 Condition of the RCCB after test . 44
9.11 Verification of the behaviour of the RCCB under short-circuit conditions . 44
9.11.1 List of the short-circuit tests . 44
9.11.2 Short-circuit tests . 44
9.12 Verification of resistance to mechanical shock and impact . 51
9.12.1 Mechanical shock . 51
9.12.2 Mechanical impact . 51
9.13 Test of resistance to heat . 54
9.13.1 Test on complete RCCB . 54
9.13.2 Ball pressure test . 54
9.14 Test of resistance to abnormal heat and to fire . 55
9.15 Verification of the trip-free mechanism . 56
9.16 Verification of the operation of the test device at the limits of rated
operational voltage . 56
9.17 Void . 57
9.18 Verification of the behaviour of RCCBs in the event of overcurrent in the
main circuit . 57
9.19 Verification of the behaviour of RCCBs in the event of current surges caused
by impulse voltages . 57
9.19.1 Current surge test for all RCCBs (0,5 µs/100 kHz ring wave test) . 57
9.19.2 Verification of the behaviour at surge currents up to 3 000 A (8/20 µs
surge current test) . 58
9.20 Verification of reliability . 59
9.20.1 Climatic test. 59
9.20.2 Test with temperature of 40 °C . 60
9.21 Verification of withstand against ageing . 61
9.22 Electromagnetic compatibility (EMC) . 61
9.23 Test of resistance to rusting . 61
9.24 Verification of the behaviour of the RCCB under temporary overvoltage
(TOV) conditions . 62
9.24.1 General . 62
9.24.2 TOV test for all RCCBs . 62
9.24.3 Additional tests for RCCBs with a terminal intended to be connected to
the PE . 62
9.24.4 Verification after the tests . 62
Annex A (normative) Test sequence and number of samples to be submitted for
certification purposes . 93
Annex B (normative) Determination of clearances and creepage distances . 94
B.1 General . 94
B.2 Orientation and location of a creepage distance . 94
B.3 Creepage distances where more than one material is used . 94
B.4 Creepage distances split by floating conductive part . 94
B.5 Measurement of creepage distances and clearances . 94
Annex C (normative) Arrangement for the detection of the emission of ionized gases
during short-circuit tests . 99
Annex D (normative) Routine tests . 102
D.1 General . 102
D.2 Tripping test . 102
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D.3 Dielectric strength test . 102
D.4 Performance of the test device . 102
Annex E (informative) Methods for determination of short-circuit power-factor . 103
E.1 General . 103
E.2 Method I – Determination from DC components . 103
E.3 Method II – Determination with pilot generator . 104
Annex F (informative/normative) Void . 105
Annex G (informative/normative) Void . 106
Annex H (informative) Examples of terminal designs . 107
Annex I (informative) Correspondence between ISO and AWG copper conductors . 110
Annex J (informative) Follow-up testing program for RCCBs . 111
J.1 General . 111
J.2 Follow-up testing program . 111
J.2.1 General . 111
J.2.2 Quarterly follow-up testing program . 111
J.2.3 Annual follow-up testing program . 111
J.2.4 Sampling procedure . 112
Annex K (informative) SCPDs for short-circuit tests . 115
K.1 Introductory remark . 115
K.2 Silver wires . 115
K.3 Fuses. 116
K.4 Other means . 116
Bibliography . 117
Figure 1 – Standard test finger . 74
Figure 2 – Void . 75
Figure 3 – Void . 75
Figure 4 – Void . 75
Figure 5 – Typical diagram for all short circuit tests except for the verification of the
suitability in IT systems . 76
Figure 6 – Typical diagram for the verification of the suitability in IT systems . 77
Figure 7 – Detail of impedances Z, Z and Z . 77
1 2
Figure 8 – Mechanical shock test apparatus . 78
Figure 9 – Mechanical impact test apparatus . 79
Figure 10 – Striking element for pendulum impact test apparatus. 80
Figure 11 – Mounting support for sample for mechanical impact test. 81
Figure 12 – Example of mounting an unenclosed or flush-type RCCB for mechanical
impact test . 82
Figure 13 – Example of mounting of panel mounting type RCCB for the mechanical
impact test . 83
Figure 14 – Application of force for mechanical test of rail mounted RCCB . 84
Figure 15 – Ball-pressure test apparatus. 84
Figure 16 – Current ring wave 0,5 µs/100 kHz . 85
Figure 17 – Test circuit for the ring wave test on RCCBs . 85
Figure 18 – Surge current impulse 8/20 µs . 86
Figure 19 – Test circuit for the surge current test of RCCBs . 86
IEC 61008-1:2024 © IEC 2024 – 7 –
Figure 20 – Stabilizing period for reliability test . 87
Figure 21 – Reliability test cycle . 88
Figure 22 – Void . 88
Figure 23 – Example of records for short-circuit tests . 89
Figure 24 – Test circuit for the verification of the behaviour under temporary
overvoltage (TOV) conditions for RCCBs with a terminal intended to be connected to
the PE . 90
Figure 25 – Test apparatus for the verification of the minimum I t and I values to be
p
withstood by the RCCB . 91
Figure 26 – Void . 91
Figure 27 – Diagrammatic representation for glow-wire test . 92
Figure B.1 – Measuring creepage distances and clearances: Example 1 . 95
Figure B.2 – Measuring creepage distances and clearances: Example 2 . 95
Figure B.3 – Measuring creepage distances and clearances: Example 3 . 95
Figure B.4 – Measuring creepage distances and clearances: Example 4 . 96
Figure B.5 – Measuring creepage distances and clearances: Example 5 . 96
Figure B.6 – Measuring creepage distances and clearances: Example 6 . 96
Figure B.7 – Measuring creepage distances and clearances: Example 7 . 97
Figure B.8 – Measuring creepage distances and clearances: Example 8 . 97
Figure B.9 – Measuring creepage distances and clearances: Example 9 . 97
Figure B.10 – Measuring creepage distances and clearances: Example 10 . 98
Figure B.11 – Measuring creepage distances and clearances: Example 11 . 98
Figure C.1 – Example of test arrangement . 100
Figure C.2 – Grid . 101
Figure C.3 – Grid circuit . 101
Figure H.1 – Examples of pillar terminals . 107
Figure H.2 – Examples of screw terminals and stud terminals . 108
Figure H.3 – Examples of saddle terminals . 109
Figure H.4 – Examples of lug terminals . 109
Table 1 – Marking . 63
Table 2 – Void . 64
Table 3 – Void . 64
Table 4 – Void . 64
Table 5 – Void . 64
Table 6 – Void . 64
Table 7 – Void . 64
Table 8 – Void . 64
Table 9 – Void . 64
Table 10 – Void . 64
Table 11 – Standard limit values of break time and non-actuating time for alternating
residual currents (RMS values) for type AC and A . 64
Table 12 – Standard maximum values of break time for half-wave residual currents
(RMS values) for type A . 64
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Table 13 – Void . 65
Table 14 – Tripping current limits . 65
Table 15 – Void . 65
Table 16 – Void . 65
Table 17 – Void . 65
Table 18 – Void . 65
Table 19 – Rated impulse withstand voltage as a function of the nominal voltage of the
installation . 65
Table 20 – Minimum clearances and creepage distances . 66
Table 21 – Test voltage of auxiliary circuits . 68
Table 22 – Test voltage for verification of rated impulse withstand voltage. 68
Table 23 – Test voltage for verifying the suitability for isolation, with reference to the rated
impulse withstand voltage of the RCCB and the altitude where the test is carried out . 68
Table 24 – Connectable cross-sections of copper conductors for screw-type terminals . 69
Table 25 – Test copper conductors corresponding to the rated currents . 69
Table 26 – Screw thread diameters and applied torques . 69
Table 27 – Pulling forces . 70
Table 28 – Temperature-rise values . 70
Table 29 – Power factor ranges of the test circuit . 70
Table 30 – Withstand values and duration of temporary overvoltages . 70
Table 31 – Void . 71
Table 32 – Void . 71
Table 33 – Void . 71
Table 34 – Void . 71
Table 35 – Tests to be made to verify the behaviour of RCCBs under short-circuit
conditions . 71
Table 36 – Minimum values of I t and I . 71
p
Table 37 – Void . 72
Table 38 – Void . 72
Table 39 – Void . 72
Table 40 – Void . 72
Table 41 – Void . 72
Table 42 – Void . 72
Table 43 – Void . 72
Table 44 – Void . 72
Table 45 – Void . 72
Table 46 – Standard values of rated operational voltage . 72
Table 47 – Values of influencing quantities . 73
Table J.1 – Test sequences during follow-up inspections . 112
Table J.2 – Number of samples to be tested . 114
Table K.1 – Indication of silver wire diameters as a function of rated currents and
short-circuit currents . 115
IEC 61008-1:2024 © IEC 2024 – 9 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RESIDUAL CURRENT OPERATED CIRCUIT-BREAKERS
WITHOUT INTEGRAL OVERCURRENT PROTECTION
FOR HOUSEHOLD AND SIMILAR USES (RCCBS) –
Part 1: General rules
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, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in thi
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