1、BRITISH STANDARD AEROSPACE SERIES BSEN 3774-003:1999 Circuit breakers, three-pole, temperature compensated, rated currents2A to25A, switching capacity65I n Part003: Metric thread terminals Product standard The European Standard EN3774-003:1999 has the status of a BritishStandard ICS 49.060BSEN3774-0
2、03:1999 This BritishStandard, having been prepared under the directionof the Engineering SectorCommittee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15August1999 BSI 03-2000 ISBN 0 580 32897 X National foreword This BritishStandard is the English language vers
3、ion of EN3774-003:1999. Together with the other parts of BSEN3774 and BSEN2665, in all its parts, it supersedes BSG179-2:1966 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology, to Subcommit
4、tee ACE/6/5, Aerospace Protection of electrical systems, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related internationa
5、l and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references t
6、o international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”
7、, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself conf
8、er immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the
9、amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN3774-003:1999 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN3774-003 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN3774-003 June 1999 ICS 49
10、.060 English version Aerospace series Circuit breakers, three-pole, temperature compensated, rated currents2A to25A, switching capacity65I n Part003: Metric thread terminals Product standard Srie arospatiale Disjoncteurs tripolaires compenss en temprature, intensits nominales2A 25A, pouvoir de coupu
11、re65I n Partie003: Bornes filetage mtrique Norme de produit Luft- und Raumfahrt Schutzschalter, dreipolig, temperaturkompensiert, Nennstrme von2A bis25A, Schaltvermgen65I n Teil003: Metrisches Klemmengewinde Produktnorm This European Standard was approved by CEN on4 September 1998. CEN members are b
12、ound 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
13、 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 statu
14、s as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Stand
15、ardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN3774-3:1999 EEN3774-003:1999 BSI 03-2000 2 Forewo
16、rd This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries 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 me
17、mber countries ofAECMA, prior to its presentation to CEN. This European Standard shall be given the status ofa national standard, either by publication of an identical text or by endorsement, at the latest by December 1999, and conflicting national standards shall be withdrawn at the latest by Decem
18、ber 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, No
19、rway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Required characteristics 3 4.1 Short-circuit performance 3 4.2 Dimensions, mounting, electrical connections 4 4.3 Fasteners 5 4.4 Mass 6 5 Designation 6 6 Ma
20、rking 6 Figure 1 Circuit breaker 4 Figure 2 Panel cut-out (panel thickness1,5to3) 4 Figure 3 Electrical connection 4 Figure 4 Screw 5 Figure 5 Washer 5 Figure 6 Attachment nut 5 Figure 7 Lock washer 5 Table 1 6EN3774-003:1999 BSI 03-2000 3 1 Scope This standard specifies the required characteristics
21、 for three-pole, temperature compensated circuit breakers, rated currents from2A to25A, switching capacity65I n , metric threads terminals, for use in aircraft electrical systems. Their operating temperatures are between55 C and125 C for rated currents equal or lower than15A and between55 C and90 C
22、for rated currents higher than15A, at amaximum altitude of Z=22000m. It shall be used together with EN3774-001. These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN2282. 2 Normative references This European Standard incorporates by dated or undated r
23、eference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorp
24、orated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO965-2, ISO general purpose metric screw threads Tolerances Part2: Limits of sizes for general purpose bolt and nut threads Medium quality. ISO1190-1, Copper and copper alloys C
25、ode of designation Part1: Designation of materials. ISO7045, Cross-recessed pan head screws Product grade A. EN2282, Aerospace series Characteristics of aircraft electrical supplies. EN2350, Aerospace series Circuit breakers Technical specification. EN3774-001, Aerospace series Circuit breakers, thr
26、ee-pole, temperature compensated, rated currents2A to25A, switching capacity65I n Part001: Technical specification. 3 Definitions For the purposes of this standard the definitions given in EN2350 apply. 4 Required characteristics 4.1 Short-circuit performance Test current:65I nprospective,0,8k cos:1
27、 Number of CO/OCO tests:1CO+2OCOEN3774-003:1999 4 BSI 03-2000 4.2 Dimensions, mounting, electrical connections SeeFigure 1, Figure 2 and Figure 3. Dimensions and tolerances are in millimetres. Figure 1 Circuit breaker Figure 2 Panel cut-out (panelthickness1,5to3) Figure 3 Electrical connectionEN3774
28、-003:1999 BSI 03-2000 5 4.3 Fasteners Dimensions and tolerances are in millimetres. 4.3.1 For electrical connections SeeFigure 4 and Figure 5. 4.3.2 For mounting SeeFigure 6 and Figure 7. Screw: ISO7045 M4 64,8Z Material: steel Protection: zinc plated, passivated, bright Two wave corrugated washer M
29、aterial: CuBe1,9 to ISO1190-1 Hardness:350HV to410HV Figure 4 Screw Figure 5 Washer Thread to ISO965-2 Material: aluminium alloy2017 a Protection: black sulphur anodized M12 DIC lock washer (internal serrated teeth) Material: steel Hardness:400HV to480HV Protection: black zinc dichromate a Designati
30、on of “ALUMINUM ASSOCIATION” Figure 6 Attachment nut Figure 7 Lock washerEN3774-003:1999 6 BSI 03-2000 4.4 Mass Maximum mass:65g (provisioning code D) 5 Designation EXAMPLE: NOTEIf necessary, the code I9005 shall be placed between the description block and the identity block. Table 1 6 Marking SeeEN
31、2350. The provisioning code shall not be marked on the product. Code Fasteners for terminals Fasteners for mounting None Fitted Supplied separately None Fitted Supplied separately A X X B X X C X X D X X E X X blankBS EN 3774-003:1999 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInsti
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