SIST EN 3841-308:2005

• Abstract:

  This standard specifies a method of verifying the ability of circuit breakers to withstand the indirect effects of a stroke of lightning.; It shall be used together with EN 3841-100.

• Status: Published
• Publication Date: 31-Mar-2005
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2005
• Due Date: 01-Apr-2005
• Completion Date: 01-Apr-2005
• Ref Project: EN 3841-308:2004 - Aerospace series - Circuit breakers - Test methods - Part 308: Lightning

• Refers: SIST EN 3841-100:2024 - Aerospace series - Circuit breakers - Test methods - Part 100: General
• Effective Date: 28-Jan-2026
• Refers: SIST EN 14893:2007 - LPG equipment and accessories - Transportable Liquefied Petroleum Gas (LPG) welded steel pressure drums with a capacity between 150 litres and 1 000 litres
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2995-001:2024 - Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4839-001:2018 - Aerospace series - Arc fault circuit breakers, three-poles, temperature compensated, rated current 3 A to 25 A - 115 V a.c. 400 Hz constant frequency - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3774-001:2025 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3774-001:2015 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3661-001:2025 - Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 858-1:2002 - Separator systems for light liquids (e.g. oil and petrol) - Part 1: Principles of product design, performance and testing, marking and quality control
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3773-001:2025 - Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4838-001:2018 - Aerospace series - Arc Fault Circuit breakers, single-pole, temperature compensated, rated current 3 A to 25 A - 115 V a.c. 400 Hz Constant Frequency - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2665-001:2014 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated current 20 A to 50 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2794-001:2014 - Aerospace series - Circuit breakers, single-pole, temperature compensated, rated current 20 A to 50 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 3662-001:2025 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 20 A to 50 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 2996-001:2024 - Aerospace series - Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 1825-1:2004 - Grease separators - Part 1: Principles of design, performance and testing, marking and quality control
• Effective Date: 28-Jan-2026

SIST EN 3841-308:2005 is the Slovenian adoption of EN 3841-308:2004 for aerospace circuit breakers. It specifies a lightning test method for checking whether circuit breakers can withstand the indirect effects of a lightning stroke, and it is used together with EN 3841-100.

What does SIST EN 3841-308:2005 specify?

SIST EN 3841-308:2005 specifies one test method for aerospace circuit breakers exposed to lightning-related transients. The method is for verification, so it matters when a design has to be qualified or checked against lightning effects in service.

The document is organized into a foreword, Clause 1 on scope, Clause 2 on normative references, and Clause 3 on the method. Clause 3 is split into the test procedure and the acceptance requirement, which makes the document easy to use as a lab instruction.

What are the key requirements of SIST EN 3841-308:2005?

SIST EN 3841-308:2005 sets out how to mount, energize, pulse, and judge circuit breakers during the lightning test. In practice, the clause 3 steps define the test set-up and the pass condition.

• Use with EN 3841-100. The standard says it shall be used together with EN 3841-100. For users, that means this part is not a complete test system on its own - it belongs to the broader circuit-breaker test-method family.

• Mount the circuit breaker as shown in ISO 7137. Clause 3.1 requires mounting in accordance with Figure 22.2 in test procedure 3.8 of ISO 7137. This matters because the mechanical and electrical arrangement influences the test result.

• Apply the ISO 7137 lightning procedure. Clause 3.1 sends the user to ISO 7137, test procedure 3.8, and to the long wave test category M levels quoted there. In practice, the laboratory follows the referenced airborne-equipment procedure rather than creating its own lightning setup.

• Use the specified impulse sequence. Clause 3.1 calls for five positive and five negative impulses every minute on each nominal voltage stated in the technical specification. That tells the tester how often to pulse, which polarities to use, and to test each declared operating voltage.

• Test at the stated load condition. Clause 3.1 requires loading the circuit breakers at 0.9 In. For users, this means the device is tested under a defined operating load, not in an unloaded state.

• Do not accept tripping. Clause 3.2 requires that the circuit breakers shall not trip during testing. This is the practical pass/fail criterion for qualification or verification.

What terms does SIST EN 3841-308:2005 define?

SIST EN 3841-308:2005 uses a small set of technical terms that frame the test.

• Circuit breaker - the protective switching device being verified by the lightning test.
• Indirect effects of a stroke of lightning - lightning effects that reach the equipment through induced or coupled transients rather than a direct strike on the breaker itself.
• Nominal voltages - the voltage values identified in the technical specification and used as the test points.
• Positive impulse - a pulse of one polarity applied during the test sequence.
• Negative impulse - a pulse of the opposite polarity applied during the test sequence.
• Long wave test category M - the ISO 7137 lightning test category named in this standard for the applied test levels.
• Procedure 3.8 - the ISO 7137 airborne-equipment test procedure referenced for mounting and test execution.

Who uses SIST EN 3841-308:2005?

SIST EN 3841-308:2005 is used by aerospace manufacturers, test laboratories, qualification engineers, and quality teams working on circuit breakers. It supports design verification, environmental and lightning test planning, and acceptance decisions for airborne electrical equipment and systems.

What changed in SIST EN 3841-308:2005 from the previous edition?

SIST EN 3841-308:2005 is identified as identical to EN 3841-308:2004.

Which standards are used with SIST EN 3841-308:2005?

SIST EN 3841-308:2005 names two referenced standards.

• ISO 7137 - provides the aircraft environmental conditions and airborne-equipment test procedures, including the mounting arrangement and test procedure 3.8 used here.
• EN 3841-100 - provides the general part of the aerospace circuit-breaker test methods and is required for using this part correctly.

What does the SIST EN 3841-308:2005 document contain?

SIST EN 3841-308:2005 contains the foreword, the scope, the normative references, and one method clause with a procedure and a requirement. The method clause gives the test set-up through a referenced figure in ISO 7137, the impulse sequence, the loading condition, and the no-trip acceptance criterion.

For a test lab, the useful content is the linkage to ISO 7137 and the explicit pass/fail rule. For a buyer or quality manager, the document shows that this part is a focused lightning-verification method for circuit breakers, not a general product specification.

SLOVENSKI STANDARD
01-april-2005
Aeronavtika - Odklopniki - Preskusne metode - 308. del: Strela
Aerospace series - Circuit breakers - Test methods - Part 308: Lightning
Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil 308: Blitz
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Partie 308 : Foudre
Ta slovenski standard je istoveten z: EN 3841-308:2004
ICS:
49.060 /HWDOVNDLQYHVROMVND Aerospace electric
HOHNWULþQDRSUHPDLQVLVWHPL equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 3841-308
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 49.060
English version
Aerospace series - Circuit breakers - Test methods - Part 308:
Lightning
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil
Partie 308 : Foudre 308: Blitz
This European Standard was approved by CEN on 10 September 2004.
CEN 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 Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
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CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
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Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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EUROPÄISCHES KOMITEE FÜR NORMUNG
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© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3841-308:2004: E
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Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Method .
...