CLC/TC 23E

Date: 2025-10

prEN IEC 61009‑2‑1:202X/prAA:202X

Secretariat: Italy

Residual current operated circuit-breakers with integral overcurrent protection for household andsimilar uses (RCBOs) – Part 2-1: RCBOs according to classification 4.1.1

CCMC will prepare and attach the official title page.

Contents Page

European foreword 3

1 Modification to 9.9.1.1, “Test circuit and test procedure” 4

2 Modification to 9.15.1, “General test conditions” 4

3 Addition of 9.Z1, “Verification of the correct operation at low ambient air temperatures for RCBOs for use at temperatures between −25 °C and +40 °C” 4

4 Modification to Figure 2, “Test circuit for the verification of operating characteristics, and trip-free mechanism for RCBOs classified according to 4.1.1” 5

5 Addition of Figure Z6, “Test cycle for low temperature test (9.Z1)” 5

6 Modification to Table A.1, “Test sequences” 5

7 Modification to A.2, “Number of samples to be submitted for full test procedure” 6

8 Modification to Table A.2, “Number of samples for full test procedure” 6

9 Modification to Table A.3, “Number of samples for simplified test procedure” 6

10 Modification to Table A.4, “Test sequences for RCBOs having different instantaneous tripping currents” 7

11 Modification to Table A.5, “Test sequences for RCBOs of different classification according to 4.3 of IEC 61009‑1:2024” 7

12 Addition of Annex ZA, “Normative references to international publications with their corresponding European publications” 7

13 Addition of Annex ZB, “Special National Conditions” 8

European foreword

This document (prEN IEC 61009‑2‑1:2026/prAA:2026) has been prepared by CLC/TC 23E “Circuit breakers and similar devices for household and similar applications”.

This document is currently submitted to the Enquiry.

The following dates are proposed:

This document is read in conjunction with prEN IEC 61009‑2‑1:2026.

This document includes the following significant technical modifications with respect to prEN IEC 61009‑2‑1:2026:

— Only the essential common changes existing in EN 61009‑2‑1:1994 and all of its amendments and corrigenda (if any) are maintained in this document.

Delete the last paragraph

Delete the 2nd paragraph.

Add the following subclause:

“9.Z1 Verification of the correct operation at low ambient air temperatures for RCBOs for use at temperatures between −25 °C and +40 °C

Enclosed-type RCBOs are tested in their enclosure, unenclosed-type RCBOs are mounted in an individual enclosure with a degree of protection IP55, and are connected as for normal use (see Figure 2).

No drain hole in the enclosure shall be opened for this test.

NOTE RCBOs tested in enclosures IP55 are suitable to be used in enclosures of a degree of protection other than IP55 within the temperature range of –25 °C to +40 °C.

The RCBO (including the enclosure) is brought into a suitable test chamber with an ambient air temperature of (23 ± 2) °C and a relative humidity of (93 ± 3) %. The volume ratio of the test chamber to the test samples (including enclosures) shall be greater than 50.

The RCBO is in the ON-position without load and shall be subjected to the following cycle (see Figure Z6).

For the first 6 h (stabilization period) the temperature is kept at (23 ± 2) °C and the humidity at (93 ± 3) %. Within the next 6 h the ambient air temperature is decreased to (−25 ± 2) °C without any supply of humidity. This temperature of (−25 ± 2) °C is kept for 6 h. Within the next 6 h the temperature is increased to (+ 23 ± 2) °C and the relative humidity is increased to (93 ± 3) % (end of the first cycle). This cycle is performed five times.

During these cycles the RCBO shall not trip.

During the fifth cycle, at the end of the period at (−25 ± 2) °C, an AC residual current is passed through one pole of the RCBO (see Figure 2)

— for RCBOs of the general type, the residual current is calibrated to 1,25 l_∆n and established by closing S2. One test only is made on one pole taken at random. The break time measured shall not exceed the value specified in Table 11 of prEN 61009‑1:2026 for l_∆n;

— for RCBOs of type S the residual current is calibrated to l,25 × 2 l_∆n and established by closing S2 One test only is made on one pole taken at random. The break time measured shall not exceed the value specified in Table 11 of prEN 61009‑1:2026 for 2 l_∆n.

In addition, RCBOs of type A are tested with pulsating DC residual currents immediately after the above test with AC residual current, the test circuit corresponding to Figure 3

— for RCBOs of the general type, the residual current is calibrated to 1,25 × 2 l_∆n for RCBOs with I_∆n ≤ 0,01 A, and to 1,25 × 1,4 l_∆n for RCBOs with l_∆n > 0,01 A. The current delay angle shall be 0°, the position of S3 is set at random, and the current is established by closing S2 One test only is made on one pole taken at random. The break time measured shall not exceed the value specified in Table 11 of prEN 61009‑1:2026 for l_∆n.

— for RCBOs of type S the residual current is calibrated to 1,25 × 1,4 × 2 l_∆n current delay angle shall be 0°, the position of S3 is set at random, and the current is established by closing S2 One test only is made on one pole taken at random. The break time measured shall not exceed the value specified in Table 11 of prEN 61009‑1:2026 for 2 l_∆n.

After these tests a visual inspection shall show that the materials have not undergone deterioration impairing the further use of the RCBO and it shall be possible to switch on the RCBO, without the presence of any residual current, at the temperature of −25 °C.”

Replace the title with the following:

“Figure 2 — Test circuit for the verification of operating characteristics, trip-free mechanism and behaviour at low ambient air temperature of RCBOs for use in the range of −25 °C to +40 °C for RCBOs classified according to 4.1.1”

Add the following Figure:

“

Figure Z6 — Test cycle for low temperature test (9.Z1)”

Delete in test sequence D₁ “9.11.13” and “Performance at I_∆m”.

Add the following test sequence:

Replace test sequence G with the following:

Delete the last paragraph, before Table A.2.

Delete in the header row “^a” in “Minimum number of accepted samples ^a,b” and replace “Test sequence” with “Test sequence ^a”.

Add the following test sequences F₂ and G₁ and replace “G” with “G₀”:

Delete “and 9.11.3” in footnote d.

Delete “^d” in the 3^rd column for test sequence D.

Delete footnote e and the reference to footnote e next to test sequences H, I and J.

Add the following footnote e:

“^e   For the test of 9.5 in sequence A1, if the number of terminals of one sample is not sufficient to perform each test on a new terminal, additional samples may be used”.

Add a reference to footnote e next to test sequence “A1”.

Replace test sequence “C” with “C₁”.

Add the following test sequence C₂:

Add the following test sequence F₂:

Replace test sequence “G” witth “G₀”.

Add the following test sequence G₁:

Replace footnotes c, d, e and j with the following:

“

^c   Also applicable to two-pole RCBOs with one protected pole.

^d   Void

^e   Also applicable to four-pole RCBOs with three protected poles.

^j   If a four-pole RCBO with three protected poles and a four-pole RCBO are submitted, then only the four-pole RCBO is tested, with exception of the test of 9.8 of test sequence B for which both types are submitted to the test.”

Delete the reference to footnote d in the 3^rd column, next to “three poles”.

Delete footnote k and the reference to footnote k next to test sequence H.

Replace footnote a with the following:

“^a   For sequence B, only the tests of 9.8 shall be performed on 3 samples of maximum rating In with minimum rating I_Δn. For sequence E0, only the test 9.9.2.2 shall be performed on one sample of all ratings In with minimum rating I_Δn.”

Replace footnotes c, d and e with the following:

^“c   Also applicable to two-pole RCBOs with one protected pole.

^d   Void

^e   Also applicable to four-pole RCBOs with three protected poles.”

Delete the reference to footnote d in the 3^rd column, next to “three poles”.

Add the following Annex ZA:

“

Annex ZA
(normative)

Normative references to international publications with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1   Where an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

NOTE 2   Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cencenelec.eu.

“

Add the following Annex ZB:

“

Annex ZB
(normative)

Special National Conditions

Special national condition: National characteristic or practice that cannot be changed even over a long period, e.g. climatic conditions, electrical earthing conditions.

NOTE If it affects harmonization, it forms part of the European Standard or Harmonization Document.

For the countries in which the relevant special national conditions apply these provisions are normative, for other countries they are informative.

“