SIST EN IEC 63522-12:2025

Electrical relays - Tests and Measurements - Part 12: Internal Moisture

IEC 63522-12:2025 Used for testing electromechanical elementary relays (electromechanical relays, reed relays, reed contacts, reed switches and technology combination of these) and evaluates their ability to perform under expected conditions of transportation, storage, and all aspects of operational use.
This document defines a standard test method to provoke internal moisture inside relays by different methods. The device under test (DUT) is tested at its specified energization values throughout the defined temperature range.
The test methods in this document are applicable to RT III, RT IV and RT V products only, i.e., wash-tight, sealed, and hermetically sealed DUTs.

Elektrische Relais – Mess- und Prüfverfahren – Teil 12: Interne Luftfeuchtigkeit

Relais électriques - Essais et mesurages - Partie 12: Humidité interne

IEC 63522-12:2025 Le présent document traite des essais des relais électromécaniques élémentaires (relais électromécaniques, relais à lames souples, contacts à lames souples et leur combinaisons technologiques) et permet d'évaluer leur aptitude à fonctionner dans des conditions prévues de transport, de stockage, et tous les aspects d'utilisation opérationnelle.
Le présent document définit une méthode d'essai normalisée qui vise à provoquer de l'humidité interne dans les relais par différentes méthodes. Le dispositif soumis à l'essai (DUT, Device Under Test) l'est aux valeurs d'alimentation spécifiées dans la plage de températures définie.
Les méthodes d'essai du présent document ne s'appliquent qu'aux produits RT III, RT IV et RT V, c'est-à-dire aux DUT étanches au lavage, étanches et hermétiquement étanches.

Električni releji - Preskusi in meritve - 12. del: Notranja vlaga

Standard IEC 63522-12:2025 se uporablja za preskušanje elektromehanskih osnovnih relejev (elektromehanskih relejev, relejev reed, kontaktov reed, stikal reed in njihovih tehnoloških kombinacij) in ocenjevanje njihove zmožnosti delovanja v pričakovanih pogojih med transportom in skladiščenjem ter v vseh vidikih operativne uporabe.  Ta dokument določa standardno preskusno metodo, s katero se povzroči notranja vlaga v relejih z različnimi metodami. Preskušana naprava (DUT) se preskusi pri navedenih vrednostih električnega napajanja v celotnem določenem temperaturnem območju.  Preskusne metode v tem dokumentu se uporabljajo samo za izdelke RT III, RT IV in RT V, tj. za vodotesne, zatesnjene in hermetično zaprte preskušane naprave.

General Information

• Status: Published
• Public Enquiry End Date: 31-Oct-2023
• Publication Date: 03-Apr-2025
• ICS: 29.120.70 - Relays
• Technical Committee: ISS EIT.ERE - All-or-nothing electrical relays
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Mar-2025
• Due Date: 31-May-2025
• Completion Date: 04-Apr-2025
• Ref Project: EN IEC 63522-12:2025 - Electrical relays - Tests and measurements - Part 12: Internal moisture

Overview - EN IEC 63522-12:2025 (Internal moisture)

EN IEC 63522-12:2025 is a CLC/CENELEC-adopted European version of IEC 63522-12:2025, titled Electrical relays - Tests and measurements - Part 12: Internal moisture. Published/approved in March 2025, this standard defines repeatable test methods to provoke and detect internal moisture in electromechanical elementary relays (electromechanical relays, reed relays, reed contacts and reed switches, and combinations). It applies specifically to RT III, RT IV and RT V products (wash‑tight, sealed and hermetically sealed relays) and evaluates relay performance across expected conditions of transportation, storage and normal operation.

Key topics and technical requirements

• Scope and DUT: Tests apply to new, clean devices under test (DUT), mounted as in service. A minimum of 5 DUTs is required (10 preferred) because moisture effects can be statistical.
• Two defined test methods:
  • Method 1 - External temperature impact: Coil energized at specified value while DUT is held at maximum rated temperature for 1 h, then minimum rated temperature for 1 h. Temperature change rate normally (5 ± 1) K/min. Insulation resistance between contacts and enclosure is measured at 20 min intervals per IEC 63522‑5.
  • Method 2 - Over‑energization at room temperature: Coil energized at 140% of rated energization for 2.5 min. Insulation resistance measured at 30 s intervals per IEC 63522‑5.
• Monitoring and evaluation: Functional behaviour is monitored (contact state, terminals or coils), and final insulation resistance measurements are taken. Test reports shall document conditions, measurements and observations.
• Measurement standards referenced: Insulation resistance per IEC 63522‑5; general guidance in IEC 63522‑0. The standard also cross‑references IEC 63522 series parts and IEC 60068‑2‑14 for temperature change guidance.

Practical applications and users

Who benefits:

• Relay manufacturers - design verification, production validation and quality control for sealed and hermetic relay designs.
• Test laboratories and certification bodies - executing standard internal moisture tests for compliance and supplier assessments.
• R&D and reliability engineers - evaluating susceptibility to condensation and moisture ingress under thermal stress or over‑energization.
• Procurement and OEMs - specifying test requirements for relays used in transportable, industrial, automotive or harsh‑environment equipment.

Why use it:

• To verify that sealed, wash‑tight and hermetic relays maintain insulation resistance and functional performance when exposed to realistic temperature cycles or internal heating events that can produce moisture condensation.

Related standards

• IEC/EN IEC 63522 series (Parts 0, 1, 5, 6, 7)
• IEC 60068‑2‑14 (temperature change guidance)

Keywords: EN IEC 63522-12:2025, internal moisture, electromechanical relays, reed relays, tests and measurements, insulation resistance, over-energization, temperature cycling, sealed relays.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2025
Električni releji - Preskusi in meritve - 12. del: Notranja vlaga
Electrical relays - Tests and Measurements - Part 12: Internal Moisture
Elektrische Relais – Mess- und Prüfverfahren – Teil 12: Interne Luftfeuchtigkeit
Relais électriques - Essais et mesurages - Partie 12: Humidité interne
Ta slovenski standard je istoveten z: EN IEC 63522-12:2025
ICS:
29.120.70 Releji Relays
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 63522-12

NORME EUROPÉENNE
EUROPÄISCHE NORM March 2025
ICS 29.120.70
English Version
Electrical relays - Tests and measurements - Part 12: Internal
moisture
(IEC 63522-12:2025)
Relais électriques - Essais et mesurages - Partie 12: Elektrische Relais - Mess- und Prüfverfahren - Teil 12:
Humidité interne Interne Luftfeuchtigkeit
(IEC 63522-12:2025) (IEC 63522-12:2025)
This European Standard was approved by CENELEC on 2025-03-14. 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.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists 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.

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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63522-12:2025 E

European foreword
The text of document 94/1050/FDIS, future edition 1 of IEC 63522-12, prepared by TC 94 "Electrical
relays" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-03-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-03-31
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63522-12:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60068-2-14:2023 NOTE Approved as EN IEC 60068-2-14:2023 (not modified)
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.
Publication Year Title EN/HD Year
1 2
IEC 63522-0 — Electrical relays - Tests and Measurements - EN IEC 63522-0 —
Part 0: General and Guidance
3 4
IEC 63522-1 - Electrical relays - Tests and measurements - EN IEC 63522-1 -
Part 1: Visual inspection and check of
dimensions
5 6
IEC 63522-5 - Electrical relays - Tests and measurements - EN IEC 63522-5 -
Part 5: Insulation resistance
IEC 63522-6 - Electrical relays - Tests and measurements - EN IEC 63522-6 -
Part 6: Contact-circuit resistance (or voltage
drop)
8 9
IEC 63522-7 - Electrical relays - Tests and measurements - EN IEC 63522-7 -
Part 7: Functional tests
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.
Under preparation. Stage at the time of publication: prEN IEC 63522-0:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-1:2025.
Under preparation. Stage at the time of publication: FprEN IEC 63522-1:2025.
Under preparation. Stage at the time of publication: IEC FDIS 63522-5:2025.
Under preparation. Stage at the time of publication: FprEN IEC 63522-5:2025.
Under preparation. Stage at the time of publication: FprEN IEC 63522-6:2024.
Under preparation. Stage at the time of publication: IEC FDIS 63522-7:2025.
Under preparation. Stage at the time of publication: FprEN IEC 63522-7:2024.
IEC 63522-12 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays – Tests and measurements –

Part 12: Internal moisture
Relais électriques – Essais et mesurages –

Partie 12: Humidité interne
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.70  ISBN 978-2-8327-0155-3

– 2 – IEC 63522-12:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Test procedure . 6
4.1 Purpose . 6
4.2 Procedure . 6
4.2.1 General . 6
4.2.2 Method 1: External temperature impact . 6
4.2.3 Method 2: Over-energization at room temperature . 7
4.3 Conditions . 7
5 Evaluation . 7
5.1 General . 7
5.1.1 Method 1: External temperature impact . 7
5.1.2 Method 2: Over-energization at room temperature . 8
5.2 Test report . 8
Bibliography . 9

IEC 63522-12:2025 © IEC 2025 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL RELAYS – TESTS AND MEASUREMENTS –

Part 12: Internal moisture
FOREWORD
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