SIST EN 3841-404:2005
(Main)Aerospace series - Circuit breakers - Test methods - Part 404: Explosion proofness
Aerospace series - Circuit breakers - Test methods - Part 404: Explosion proofness
This standard specifies a method of verifying explosion proofness of circuit breakers.
It shall be used together with EN 3841-100.
Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil 404: Explosionsdichtheit
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Partie 404 : Antidéflagration
Aeronavtika - Odklopniki - 404. del: Eksplozijska tesnost
General Information
- Status
- Published
- Publication Date
- 31-Mar-2005
- 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
Overview
EN 3841-404:2004 specifies a test method to verify the explosion-proofness of aerospace circuit breakers. Intended for use together with EN 3841-100, this standard defines the environmental and procedural requirements for validating that a circuit breaker does not ignite an explosive atmosphere when operated. It was prepared by AECMA-STAN and approved by CEN.
Key Topics
Test mounting and chamber: Circuit breakers are mounted approximately in the centre of a test chamber with a minimum volume of 25 L to ensure even exposure. The chamber is equipped with a spark plug to verify combustibility and with a facility to operate the breaker while closed.
Test circuits: Single-pole d.c./a.c. and three-pole a.c. arrangements are referenced (see test figures in the standard). Test circuits include switches, loading resistors, inductances and measurement provisions.
Test atmosphere: The explosive mixture is a gas mixture of air and fuel vapor (options include 100/130 octane gasoline, propane, or standard hexane) at a volumetric ratio of 13:1, prepared in accordance with ISO 7137.
Temperature and pressure: The specified test temperature is 70 °C, and the chamber pressure is atmospheric pressure at normal altitude.
Procedure and timing: The chamber is heated and filled with the explosive mixture. Test specimens are stored in the explosive atmosphere for 3 hours prior to actuation. Operations defined by the product standard are performed at 1-hour intervals while maintaining an explosive mixture.
Acceptance requirement: The explosive mixture must not ignite during circuit breaker operation. After testing, combustibility is verified with the spark plug. If the mixture fails to ignite at verification, the test shall be repeated with new samples.
Applications
This test method is applicable to manufacturers, test laboratories and design engineers involved in aerospace electrical equipment and avionics who need to:
- Validate that circuit breakers meet explosion-proofness requirements for use in fuel-vapor environments
- Demonstrate compliance as part of product qualification when referenced by product standards
- Support risk assessments for installation of circuit breakers in confined or flammable atmospheres
Related Standards
- EN 3841-100 - Aerospace series - Circuit breakers - Test methods - Part 100: General (to be used together with EN 3841-404)
- ISO 7137 - Aircraft - Environmental conditions and test procedures for airborne equipment (reference for atmosphere preparation)
This standard focuses on practical verification steps-mounting, chamber preparation, atmosphere composition, test sequence and acceptance criteria-to ensure reliable explosion-proof performance of aerospace circuit breakers.
Frequently Asked Questions
SIST EN 3841-404:2005 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Circuit breakers - Test methods - Part 404: Explosion proofness". This standard covers: This standard specifies a method of verifying explosion proofness of circuit breakers. It shall be used together with EN 3841-100.
This standard specifies a method of verifying explosion proofness of circuit breakers. It shall be used together with EN 3841-100.
SIST EN 3841-404:2005 is classified under the following ICS (International Classification for Standards) categories: 49.060 - Aerospace electric equipment and systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 3841-404:2005 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-april-2005
Aeronavtika - Odklopniki - 404. del: Eksplozijska tesnost
Aerospace series - Circuit breakers - Test methods - Part 404: Explosion proofness
Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil 404: Explosionsdichtheit
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Partie 404 : Antidéflagration
Ta slovenski standard je istoveten z: EN 3841-404:2004
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 3841-404
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 49.060
English version
Aerospace series - Circuit breakers - Test methods - Part 404:
Explosion proofness
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil
Partie 404 : Antidéflagration 404: Explosionsdichtheit
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
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3841-404:2004: E
worldwide for CEN national Members.
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Method .4
3.1 Test mounting .4
3.2 Procedure .6
3.3 Requirement.6
Foreword
This document (EN 3841-404:2004) has been prepared by the European Association of Aerospace
Manufacturers - Standardization (AECMA-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Stan
...
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