oSIST prEN IEC 61009-2-1:2026/oprAA:2026

• Abstract:

  IEC 61009-1:2024, Clause 1 is applicable except for the first paragraph and the last paragraph,; which are replaced by the following, respectively:; This document applies to residual current operated circuit-breakers with integral overcurrent; protection for household and similar uses (hereafter referred to as RCBOs), classified according; to IEC 61009-1:2024, 4.1.1. RCBOs according to this document are intended for voltages not; exceeding 440 V AC with frequencies of 50 Hz, 60 Hz or 50/60 Hz and currents not exceeding; 125 A and rated short-circuit capacities not exceeding 25 000 A for operation at 50 Hz or 60 Hz.; This document applies in conjunction with IEC 61009-1:2024. It specifies requirements, tests; and test sequences to verify compliance and is used for certification purposes.

• Status: Not Published
• Public Enquiry End Date: 27-Feb-2026
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• 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
• Ref Project: FprEN IEC 61009-2-1:2026/FprAA:2026 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 2-1: RCBOs according to classification 4.1.1

oSIST prEN IEC 61009-2-1:2026/oprAA:2026 is a SIST draft amendment to the European draft standard prEN IEC 61009-2-1:2026. It concerns residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) classified according to IEC 61009-1:2024, 4.1.1, and it adds or revises the tests used to verify compliance. In practice, it is aimed at manufacturers, test laboratories and certification bodies working with RCBOs up to 440 V AC, 125 A and 25 000 A short-circuit capacity.

What does oSIST prEN IEC 61009-2-1:2026/oprAA:2026 specify?

oSIST prEN IEC 61009-2-1:2026/oprAA:2026 specifies an amendment to the RCBO test standard used with IEC 61009-1:2024. It focuses on requirements, tests and test sequences for certification of RCBOs for household and similar applications.

The document is organized as modifications to the base text, mainly in Clause 9 and Annex A, plus two new normative annexes.

Annex	What it covers
Annex ZA	Normative references to international publications with corresponding European publications
Annex ZB	Special National Conditions

What are the key requirements of oSIST prEN IEC 61009-2-1:2026/oprAA:2026?

The amendment keeps the scope on RCBOs according to IEC 61009-1:2024, 4.1.1, intended for voltages up to 440 V AC, frequencies of 50 Hz, 60 Hz or 50/60 Hz, currents up to 125 A and rated short-circuit capacities up to 25 000 A. For users, that means the device rating and classification must match the document before the test route is selected.

Test setup and general conditions

Clause 9.9.1.1 and Clause 9.15.1 are modified. In practice, this updates the test circuit, the test procedure and the general test conditions used for verification, so laboratories need to follow the amended procedure rather than relying only on the unmodified base text.

Low-temperature verification

A new Clause 9.Z1 verifies correct operation at low ambient air temperatures for RCBOs used between -25 °C and +40 °C. Enclosed-type RCBOs are tested in their enclosure, and unenclosed-type RCBOs are mounted in an individual IP55 enclosure and connected as in normal use.

The test cycle uses temperature and humidity conditioning, repeated five times. The RCBO shall not trip during the cycles, and after the low-temperature test it must still be possible to switch it on at -25 °C without residual current. For type A and type S RCBOs, the clause adds residual-current tests at the low-temperature point, with break time checked against the relevant limit in the base standard. This matters because it checks both operation and recovery in cold conditions.

Figures and test sequences

Figure 2 is revised to cover operating characteristics, trip-free mechanism and low-ambient-temperature behaviour. New Figure Z6 gives the low-temperature test cycle. Annex A tables are also updated so the test program matches the new low-temperature check and the revised sample planning.

Sample numbers and routing

Tables A.1 to A.5 are modified for full and simplified test procedures, including sample counts for devices with different protected poles, different instantaneous tripping currents and different classifications according to IEC 61009-1:2024. For manufacturers and labs, this affects how many samples are needed and which tests are run on which samples.

National application

Annex ZB records special national conditions. In Germany, type AC RCBOs are not permitted. Ireland and the United Kingdom retain specified table and footnote conditions in Annex A.

What terms does oSIST prEN IEC 61009-2-1:2026/oprAA:2026 define?

• Residual current operated circuit-breaker with integral overcurrent protection (RCBO) - A protective device that combines residual current protection and overcurrent protection in one unit.
• Type A - An RCBO type that is also tested with pulsating DC residual currents in the low-temperature verification.
• Type S - A selective RCBO type with its own low-temperature and breaking-time checks.
• Protected pole - A pole of an RCBO that is protected by the device and is used in the sample and test tables.
• Residual current - The current used in the tests to verify tripping and break time performance.
• Instantaneous tripping current - The current level used to classify some of the sample and sequence arrangements in Annex A.
• IP55 - The enclosure degree of protection used for testing unenclosed-type RCBOs in the low-temperature clause.

Who uses oSIST prEN IEC 61009-2-1:2026/oprAA:2026?

RCBO manufacturers use it to design products and plan verification tests. Test laboratories use it to set up the test circuit, sample counts and environmental conditioning.

Certification bodies use it for compliance assessment and certification testing. Quality managers, electrical product engineers and buyers use it to check whether a device matches the required RCBO classification, ratings and test regime for a given application.

What changed in oSIST prEN IEC 61009-2-1:2026/oprAA:2026 from the previous edition?

Compared with prEN IEC 61009-2-1:2026, this amendment adds the low-temperature verification in 9.Z1, revises Figure 2, adds Figure Z6 and updates the test-sequence and sample-number tables in Annex A. It also adds Annex ZA and Annex ZB. The foreword states that only the essential common changes existing in EN 61009-2-1:1994 and its amendments and corrigenda are maintained in this document.

Which standards are used with oSIST prEN IEC 61009-2-1:2026/oprAA:2026?

• prEN IEC 61009-2-1:2026 - The base European draft standard that this amendment modifies.
• IEC 61009-1:2024 - Provides the general rules and the main reference framework for RCBOs.
• IEC 61543:2022 - Gives the electromagnetic compatibility requirements for residual current-operated protective devices.
• IEC 62873-2 - Provides vocabulary for residual current devices.

What does the oSIST prEN IEC 61009-2-1:2026/oprAA:2026 document contain?

The document contains the amendment text, including changes to the test circuit, general test conditions, a new low-temperature verification clause, a revised figure for the test circuit, and a new figure for the low-temperature cycle. It also updates the Annex A test-sequence tables and sample-count tables used for full and simplified test procedures.

Annex ZA links the international references to their European publications, and Annex ZB records special national conditions. Together, these parts show how the RCBO tests are to be applied for certification and for national implementation.

SLOVENSKI STANDARD
01-februar-2026
Odklopniki na preostali (residualni) tok brez vgrajene nadtokovne zaščite za
gospodinjsko in podobno rabo (RCBOs) - 2-1. del: RCBO v skladu s klasifikacijo
4.1.1
Residual current operated circuit-breakers with integral overcurrent protection for
household and similar uses (RCBOs) - Part 2-1: RCBOs according to classification 4.1.1
Fehlerstrom-/Differenzstrom-Schutzschalter mit eingebauten Überstromschutz für
Hausinstallationen und für ähnliche Anwendungen (RCBOs) - Teil 2-1: RCBOs nach
Klassifikation 4.1.1
Ta slovenski standard je istoveten z: prEN IEC 61009-2-1:2026/prAA:2026
ICS:
29.120.50 Varovalke in druga Fuses and other overcurrent
nadtokovna zaščita protection devices
oSIST prEN IEC 61009-2- en
1:2026/oprAA:2026
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN IEC 61009-2-1:2026
NORME EUROPÉENNE
EUROPÄISCHE NORM
prAA
January 2026
ICS 29.120.50 -
English Version
Residual current operated circuit-breakers with integral
overcurrent protection for household and similar uses (RCBOs) -
Part 2-1: RCBOs according to classification 4.1.1
To be completed Fehlerstrom-/Differenzstrom-Schutzschalter mit
eingebauten Überstromschutz für Hausinstallationen und
für ähnliche Anwendungen (RCBOs) - Teil 2-1: RCBOs
nach Klassifikation 4.1.1
This draft amendment prAA, if approved, will modify the European Standard prEN IEC 61009-2-1:2026; it is submitted to CENELEC
members for enquiry.
Deadline for CENELEC: 2026-04-24.

It has been drawn up by CLC/TC 23E.

If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.

This draft amendment 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: 82334 Ref. No. prEN IEC 61009-2-1:2026/prAA:2026 E

prEN IEC 61009-2-1:2026/prAA:2026 (E)
1 Contents Page
2 European foreword . 3
3 1 Modification to 9.9.1.1, “Test circuit and test procedure” . 4
4 2 Modification to 9.15.1, “General test conditions” . 4
5 3 Addition of 9.Z1, “Verification of the correct operation at low ambient air temperatures for
6 RCBOs for use at temperatures between −25 °C and +40 °C” . 4
7 4 Modification to Figure 2, “Test circuit for the verification of operating characteristics, and
8 trip-free mechanism for RCBOs classified according to 4.1.1” . 5
9 5 Addition of Figure Z6, “Test cycle for low temperature test (9.Z1)”. 5
10 6 Modification to Table A.1, “Test sequences” . 5
11 7 Modification to A.2, “Number of samples to be submitted for full test procedure” . 6
12 8 Modification to Table A.2, “Number of samples for full test procedure” . 6
13 9 Modification to Table A.3, “Number of samples for simplified test procedure” . 6
14 10 Modification to Table A.4, “Test sequences for RCBOs having different instantaneous
15 tripping currents” . 7
16 11 Modification to Table A.5, “Test sequences for RCBOs of different classification
17 according to 4.3 of IEC 61009-1:2024” . 7
18 12 Addition of Annex ZA, “Normative references to international publications with their
19 corresponding European publications” . 7
20 13 Addition of Annex ZB, “Special National Conditions” . 8
prEN IEC 61009-2-1:2026/prAA:2026 (E)
21 European foreword
22 This document (prEN IEC 61009-2-1:2026/prAA:2026) has been prepared by CLC/TC 23E “Circuit breakers
23 and similar devices for household and similar applications”.
24 This document is currently submitted to the Enquiry.
25 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document 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 (to
conflicting with this document have to be be confirmed or
withdrawn modified when voting)
26 This document is read in conjunction with prEN IEC 61009-2-1:2026.
27 This document includes the following significant technical modifications with respect to
28 prEN IEC 61009-2-1:2026:
29 — Only the essential common changes existing in EN 61009-2-1:1994 and all of its amendments and
30 corrigenda (if any) are maintained in this document.
prEN IEC 61009-2-1:2026/prAA:2026 (E)
32 1 Modification to 9.9.1.1, “Test circuit and test procedure”
33 Delete the last paragraph
34 2 Modification to 9.15.1, “General test conditions”
35 Delete the 2nd paragraph.
36 3 Addition of 9.Z1, “Verification of the correct operation at low ambient air
37 temperatures for RCBOs for use at temperatures between −25 °C and +40 °C”
38 Add the following subclause:
39 “9.Z1 Verification of the correct operation at low ambient air temperatures for RCBOs for use at
40 temperatures between −25 °C and +40 °C
41 Enclosed-type RCBOs are tested in their enclosure, unenclosed-type RCBOs are mounted in an individual
42 enclosure with a degree of protection IP55, and are connected as for normal use (see Figure 2).
43 No drain hole in the enclosure shall be opened for this test.
44 NOTE RCBOs tested in enclosures IP55 are suitable to be used in enclosures of a degree of protection other than
45 IP55 within the temperature range of –25 °C to +40 °C.
46 The RCBO (including the enclosure) is brought into a suitable test chamber with an ambient air temperature of
47 (23 ± 2) °C and a relative humidity of (93 ± 3) %. The volume ratio of the test chamber to the test samples
48 (including enclosures) shall be greater than 50.
49 The RCBO is in the ON-position without load and shall be subjected to the following cycle (see Figure Z6).
50 For the first 6 h (stabilization period) the temperature is kept at (23 ± 2) °C and the humidity at (93 ± 3) %.
51 Within the next 6 h the ambient air temperature is decreased to (−25 ± 2) °C without any supply of humidity.
52 This temperature of (−25 ± 2) °C is kept for 6 h. Within the next 6 h the temperature is increased to (+
53 23 ± 2) °C and the relative humidity is increased to (93 ± 3) % (end of the first cycle). This cycle is performed
54 five times.
55 During these cycles the RCBO shall not trip.
56 During the fifth cycle, at the end of the period at (−25 ± 2) °C, an AC residual current is passed through one
57 pole of the RCBO (see Figure 2)
58 — for RCB
...