1、BRITISH STANDARD AEROSPACE SERIES BS EN 3841-304:2004 Circuit breakers Test methods Part 304: Tripping points The European Standard EN 3841-304:2004 has the status of a British Standard ICS 49.060 BS EN 3841-304:2004 This British Standard was published under the authority of the Standards Policy and
2、 Strategy Committee on 22 February 2005 BSI 22 February 2005 ISBN 0 580 45527 0 National foreword This British Standard is the official English language version of EN 3841-304:2004. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and f
3、ibre optic technology, to Subcommittee ACE/6/5, Circuit breakers, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications refer
4、red to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provis
5、ions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals f
6、or change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright notice displayed in
7、 this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN3841304 December2004 ICS49.060 Englishversion AerospaceseriesCircuitbreakersTestmethodsPart304: Trippingpoints SriearospatialeDisjonc
8、teursMthodesdessais Partie304:Limitesdedclenchement LuftundRaumfahrtSchutzschalterPrfverfahrenTeil 304:Auslsegrenzen ThisEuropeanStandardwasapprovedbyCENon10September2004. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestat
9、usofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation
10、 undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,
11、Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyan
12、ymeansreserved worldwideforCENnationalMembers. Ref.No.EN3841304:2004:EEN 3841-304:2004 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Method 4 EN 3841-304:2004 (E) 3 Foreword This document (EN 3841-304:2004) has been prepared by the European Association of Aerospace Manufacturers
13、 - 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 St
14、andard 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 standar
15、ds 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, Slov
16、akia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 3841-304:2004 (E) 4 1 Scope This standard specifies a method of verifying the tripping points of circuit breakers. It shall be used together with EN 3841-100. 2 Normative references The following referenced documents are indispensable
17、 for the application 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. EN 3841-100, Aerospace series Circuit breakers Test methods Part 100: General 3 Method 3.1 General co
18、nditions The circuit breakers shall be mounted as described in clause 4 of EN 3841-100, in connection with the applicable technical specification. During the test, the current applied to the circuit breakers shall remain constant. The current may be either d.c. or a.c. with frequency indicated in th
19、e product standard and resistive load. Prior to each test, the tripped circuit breakers (with main contacts open) and their connections shall be stabilized to the specified temperature 5 C. The test shall only be carried out at normal airflow. 3.2 Tripping points 3.2.1 Minimum tripping point The cir
20、cuit breakers shall be subjected to the current specified in the product standard. The minimum tripping time shall be in accordance with the product standard. The circuit breakers shall not trip during this period. The temperature of the terminals shall be measured throughout the test. The temperatu
21、re increase of the terminals shall not exceed 75 K. For this measurement, thermocouples or other appropriate low conductivity sensors shall be used, placed on a terminal as close as possible to the housing of the circuit breaker. 3.2.2 Maximum tripping point When subjected to the current specified f
22、or the maximum tripping point in the product standard, the circuit breakers shall trip within the specified time. 3.2.3 Overload tripping The circuit breakers shall be subjected to the currents specified in the product standard and the tripping time shall be measured. EN 3841-304:2004 (E) 5 3.2.4 Tr
23、ip free release Overload tripping with the actuator button held in the closed position shall be verified in accordance with the conditions specified in the technical specification. 3.2.5 Minimum tripping points at altitude The circuit breakers shall be placed in a suitable low pressure/temperature c
24、hamber and shall be connected to the applicable current source. The chamber shall be set to the test temperature indicated in the product standard held constant for a minimum of 1 h. Then the chamber shall be brought to the atmospheric pressure corresponding to the altitude specified in the product
25、standard. Under these conditions, the circuit breakers shall be subjected to the current defined in the product standard for the minimum points at altitude and temperature. The test period shall be 1 h. 3.3 Requirements The tripping points and trip times shall meet the requirements of the product st
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