1、BRITISH STANDARD AEROSPACE SERIES BS EN 2794-003:1999 Circuit breakers, single-pole, temperature compensated, rated currents20 A to50 A Part 003: Metric thread terminals Product standard The European Standard EN2794-003:1999 has the status of a BritishStandard ICS 49.060BSEN2794-003:1999 This Britis
2、hStandard, 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 32850 3 National foreword This BritishStandard is the English language version of EN2794-003:1
3、999. Together with the other parts of BS EN2794 and BS EN3773, in all its parts, it supersedes BS G179-1:1962 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic, electrical and fibre optic technology, to Subcommittee ACE/6/5, Aer
4、ospace 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 international and European d
5、evelopments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The BritishStandards which implement international or European publications referred to in this document may be found in the BSI Standards
6、 Catalogue under the section entitled “International Standards Correspondence Index”, 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 t
7、heir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesiandii, theEN title page, pages2 to6 and a back cover. This standard has been updated (see copyr
8、ight date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN2794-003:1999 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN2794-003 3ii
9、 blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2794-003 June 1999 ICS 49.060 English version Aerospace series Circuit breakers, single-pole, temperature compensated, rated currents20 A to50 A Part003: Metric thread terminals Product standard Srie arospatiale Disjoncteurs unipolaires comp
10、enss en temprature, intensits nominales20 A 50 A Partie003: Bornes filetage mtrique Norme de produit Luft- und Raumfahrt Schutzschalter, einpolig, temperaturkompensiert, Nennstrme von20 A bis50 A Teil003: Metrisches Klemmengewinde Produktnorm This European Standard was approved by CEN on4 September1
11、998. 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
12、 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 Secretar
13、iat has the same status 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 UnitedKingdom. CEN Europea
14、n Committee for Standardization 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.EN2794-3:1999EEN2794-003:1999 BS
15、I 03-2000 2 Foreword 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
16、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 December1999, and conflicting national standards shall be withdrawn at
17、the latest by December1999. 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, Luxembour
18、g, Netherlands, Norway, 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 5 5
19、Designation 6 6 Marking 6 Figure 1 Circuit breaker 4 Figure 2 Panel cut-out (panel thickness1,5 to3) 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 6EN2794-003:1999 BSI 03-2000 3 1 Scope This standard specifies the requi
20、red characteristics for single-pole, temperature compensated circuit breakers, rated currents from20 A to50 A, metric thread terminals, for use in aircraft electrical systems, at temperatures between55 C and125 C and at a maximum altitude of Z =15000m. It shall be used together with EN2794-001. Thes
21、e 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 reference provisions from other publications. These normative references are cited at the appropriate places in the t
22、ext 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 incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to appl
23、ies. ISO 965-2, ISO general purpose metric screw threads Tolerances Part2: Limits of sizes for general purpose bolt and nut threads Medium quality. ISO 1190-1, Copper and copper alloys Code of designation Part1: Designation of materials. ISO 7045, Cross-recessed pan head screws Product grade A. EN 2
24、282, Aerospace series Characteristics of aircraft electrical supplies. EN 2350, Aerospace series Circuit breakers Technical specification. EN 2794-001, Aerospace series Circuit breakers, single-pole, temperature compensated, rated currents20A to50 A Part001: Technical specification. 3 Definitions Fo
25、r the purposes of this standard, the definitions given in EN2350 apply. 4 Required characteristics 4.1 Short-circuit performance Number of CO/OCO tests:1 CO+2OCO Test current: 28V d.c.:4000 A prospective; 115V a.c.,400Hz:1500 A prospective,0,8k cos: 1.EN2794-003:1999 4 BSI 03-2000 4.2 Dimensions, mo
26、unting, electrical connections See Figure 1, Figure 2 and Figure 3. Dimensions and tolerances are in millimetres. Figure 1 Circuit breaker Figure 2 Panel cut-out (panel thickness1,5 to3) Figure 3 Electrical connectionEN2794-003:1999 BSI 03-2000 5 4.3 Fasteners Dimensions and tolerances are in millim
27、etres. 4.3.1 For electrical connections See Figure 4 and Figure 5. 4.3.2 For mounting See Figure 6 and Figure 7. 4.4 Mass Maximum mass:70g (code provisioning code D) Screw: ISO7045M4 64,8Z Material: steel Protection: zinc plated, passivated, bright Two wave corrugated washer Material: CuBe1,9 to ISO
28、1190-1 Hardness:350HV to410HV Figure 4 Screw Figure 5 Washer Thread to ISO965-2 Material: aluminium alloy 2017 a Protection: black sulphur anodized M12 DIC lock washer (internal serrated teeth) Material: steel Hardness: 400HV to480HV Protection: black zinc dichromate a Designation of “ALUMINUM ASSOC
29、IATION” Figure 6 Attachment nut Figure 7 Lock washerEN2794-003:1999 6 BSI 03-2000 5 Designation EXAMPLE: NOTEIf necessary, the codeI9005 shall be placed between the description block and the identity block. Table 1 6 Marking See EN2350. The provisioning code shall not be marked on the product. Code
30、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 2794-003:1999 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing
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