SIST EN 3841-306:2005

Aerospace series - Circuit breakers - Test methods - Part 306: Service life

This standard specifies a method of verifying the service life of circuit breakers.
It shall be used together with EN 3841-100.

Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil 306: Lebensdauer

Série aérospatiale - Disjoncteurs - Méthodes d'essais - Partie 306 : Durée de vie

Aeronavtika - Odklopniki - Preskusne metode - 306. del: Življenjska doba

General Information

• 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 3841-306:2004 - Aerospace series - Circuit breakers - Test methods - Part 306: Service life

Overview

EN 3841-306:2004 - Aerospace series - Circuit breakers - Test methods - Part 306: Service life - specifies a reproducible method to verify the service life of circuit breakers used in aerospace applications. It is a CEN-adopted AECMA-STAN document and is intended to be used together with EN 3841-100 (General). The standard defines mounting, test-circuit requirements, cyclic operating procedures and special conditions (e.g., overload tripping) for service-life verification.

Key topics and technical requirements

• Scope: Method for verifying the mechanical and electrical service life of aerospace circuit breakers; product standards and technical specifications determine exact cycle counts and loads.
• Reference standard: Must be applied in conjunction with EN 3841-100 for general test setup and conditions.
• Mounting and test setup: Circuit breakers are mounted per EN 3841-100 and the applicable product technical specification.
• Test circuit components: Uses series-connected ohmic resistors and ironless inductors to set test current. If iron-core inductors are used, saturation must not occur before the current peak. Test circuit variants include single-pole d.c./a.c. and three-pole a.c. arrangements.
• Operating cycle definition: One cycle = one closing followed by one opening of the breaker.
• Cycle rates and actuator speed:
  • Electrical tests: 2 operating cycles per minute
  • Mechanical tests: 6–7 operating cycles per minute
  • Actuating speed: 12 mm/s
  • Duty cycle: 20%
• Service-life categories specified for verification (as detailed in product standards):
  • Service life without load
  • Service life at rated current
  • Service life at low current
  • Service life with overload tripping (procedures for break (CO) and make (OCO) operations)
• Overload tripping rules: For single-pole overload testing of multi‑pole breakers, remaining poles must carry 0.9 In (nominal current); sequence and cycle counts are defined in the product standard.

Applications and users

EN 3841-306 is used by:

• Aerospace circuit breaker manufacturers for design verification and qualification testing
• Independent test laboratories performing service-life and reliability testing
• Aerospace OEMs and suppliers for procurement validation and acceptance testing
• Certification and qualification engineers assessing lifecycle performance
• Maintenance and reliability teams establishing replacement intervals and maintenance schedules

Practical uses include proving lifetime durability under electrical/mechanical cycling, validating overload tripping endurance, and supporting product standards and certification evidence.

Related standards

• EN 3841-100 - Aerospace series – Circuit breakers – Test methods – Part 100: General (mandatory companion document)

Keywords: EN 3841-306:2004, circuit breakers, service life, aerospace test methods, EN 3841-100, overload tripping, life-cycle testing, breaker qualification.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2005
Aeronavtika - Odklopniki - Preskusne metode - 306. del: Življenjska doba
Aerospace series - Circuit breakers - Test methods - Part 306: Service life
Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil 306: Lebensdauer
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Partie 306 : Durée de vie
Ta slovenski standard je istoveten z: EN 3841-306:2004
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 3841-306
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 49.060
English version
Aerospace series - Circuit breakers - Test methods - Part 306:
Service life
Série aérospatiale - Disjoncteurs - Méthodes d'essais - Luft- und Raumfahrt - Schutzschalter - Prüfverfahren - Teil
Partie 306 : Durée de vie 306: Lebensdauer
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 3841-306:2004: E
worldwide for CEN national Members.

Contents Page
1 Scope .4
2 Normative references .4
3 Method .4

Foreword
This document (EN 3841-306:2004) 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 Standard has
received the approval of the National Associations and the Official Services of the member countries of
AECMA, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2005, and conflicting national standards shall be withdrawn at
the latest by June 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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 Uni
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