1、BRITISH STANDARD AEROSPACE SERIES BS EN 2495:1991 Specification for Single-pole circuit breakers, temperature compensated, rated currents up to 25 A Product standard This European Standard EN 2495:1990 has the status of a British StandardBSEN2495:1991 This British Standard was published under the au
2、thority ofthe Standards Board and comesinto effect on 31 May 1991 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/41 Draft for comment 88/73786 DC ISBN 0 580 19396 9 Cooperating organizations The European Committee for Standardization, under whos
3、e supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.
4、y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxemburg Inspection du
5、 Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation Unit
6、ed Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN2495:1991 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief history 2 Text of EN 2495 3 National appendix NA Inside back cover National appendix NB
7、 Inside back coverBSEN2495:1991 ii BSI 01-2000 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN2495“Aerospace series Single-pole circuit breaking temperature compensated rated currents
8、up to 25 A Product standard” published by the European Committee for Standardization (CEN). EN 2495 was produced as a result of international discussion in which the UK took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British St
9、andards are responsible for their 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, pages i and ii, theEN title page, pages 2 to 10, an inside back cover an
10、d a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2495 September 1990 UDC 621 316 57:629.7 Key words: Aircraft indu
11、stry, aircraft equipment, circuit breaker, manufacturing requirements, designation, marking English version Aerospace series Single-pole circuit breakers temperature compensated rated currents up to 25 A Product standard Srie arospatiale Disjoncteurs unipolaires compenss en temprature dintensit norm
12、inale jusqu 25 A Norme de produit Luft-und Raumfahrt Temperaturkompensierte einpolige Schutzschalter Nennstrme bis 25 A Produktnorm This European Standard was accepted by CEN on 10 January1990. CEN members are bound to comply with the requirements of the CEN Internal Regulations which stipulate the
13、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 CEN Central Secretariat or to any CEN member. This European Standard exists
14、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 CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organi
15、zations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Se
16、cretariat: rue de Stassart 36, B-1050 Brussels CEN 1990 Copyright reserved to all CEN members Ref. No. EN 2495:1990 EEN2495:1990 BSI 01-2000 2 Brief history This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out
17、in accordance with the rules of this Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. According to the Common CEN/CENELEC Rules, the following countries are bou
18、nd to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. Contents Page Brief history 2 1 Scope and field of application 3 2 References 3 3 Defi
19、nitions and symbols 3 4 Required characteristics 3 5 Designation 9 6 Marking 10 7 Technical specification 10 Figure 1 Circuit breaker 4 Figure 2 Mounting holes 5 Figure 3 Electrical connection 6 Table 1 3 Table 2 3 Table 3 7 Table 4 7 Table 5 8 Table 6 8 Table 7 8 Table 8 8 Table 9 9 Table 10 9 Tabl
20、e 11 9EN2495:1990 BSI 01-2000 3 1 Scope and field of application This standard specifies the required characteristics for single-pole temperature compensated circuit breakers of current ratings from (0,5 to 25)A. These circuit breakers are operated by a single push-pull button with trip-free release
21、, delayed tripping and are explosion proof. Their operation is ensured up to short circuit current. Their temperature range lies between 55 C and 125 C, at an altitude Z=22000mmax. This standard shall be used in conjunction with EN2350. 2 References EN 2282, Aerospace series Characteristics of aircr
22、aft electrical supplies 1) . EN 2350, Aerospace series Circuit breakers Technical specification. 3 Definitions and symbols See EN 2350. 4 Required characteristics 4.1 Rated current (I n ) and voltages See Table 1 et Table 2. Table 1 Table 2 When used on an aircraft electrical system of variable freq
23、uency in compliance with EN2282, the limit values (voltage and frequency) shall be specified. 1) Published as AECMA-standard at the date of publication of the present standard. Rated current (I n )A 0,5 1 2 2,5 3 5 7,5 10 15 20 25 Code 0A5 01A 02A 2A5 03A 05A 7A5 10A 15A 20A 25A Rating range Low Mid
24、dle High Voltages of the aircraft electrical system 28 V d.c. 26 V a.c., frequency 400 Hz, single-phase 115 V a.c., frequency 400 Hz, single-phaseEN2495:1990 4 BSI 01-2000 4.2 Dimensions, mounting, electrical connection See Figure 1, Figure 2 and Figure 3 (dimensions in mm). * or 3 on one terminal w
25、ith the other limited to 1 * The presence of marking is left to the manufacturers option Figure 1 Circuit breakerEN2495:1990 BSI 01-2000 5 Figure 2 Mounting holes Panel thickness between 1, 5 and 3EN2495:1990 6 BSI 01-2000 Figure 3 Electrical connectionEN2495:1990 BSI 01-2000 7 4.3 Mass max. 26 g 4.
26、4 Mechanical characteristics See Table 3. Table 3 4.5 Environmental characteristics See Table 4. Table 4 Characteristics Requirements Operating force Closing force 3,5 N to 45 N Opening force 5 N to 30 N Actuator button Transverse load 110 N Longitudinal load Push direction 110 N Pull direction 110
27、N Mounting Tightening torque 5 Nm Mechanical strength Run-down torque 1,5 Nm Tightening torque 1,7 Nm Electrical connection Pull force 110 N along F1 See Figure 3 Push force 55 N along F2 See Figure 3 Characteristics Requirements Vibrations 5 Hz to 20 Hz constant deflection 2 a = 2,5 mm 20 Hz to 33
28、Hz constant acceleration 19,6 m/s 2(. 2 g) 33 Hz to 74 Hz constant deflection 2 a = 0,9 mm 74 Hz to 2 000 Hz constant acceleration 98,1 m/s 2(. 10 g) Mechanical shock 490,5 m/s 2(. 50 g) 11 ms Centrifugal acceleration 166,8 m/s 2(. 17 g) Sand and dust See EN 2350 Corrosion See EN 2350 Humidity See E
29、N 2350 Category B: 10 cycles Explosion proofness I n(0,5 to 3) A, 1 000 A prospective current I n 3 A, 2 000 A prospective current Fluid contamination See EN 2350EN2495:1990 8 BSI 01-2000 4.6 Electrical characteristics See Table 5. Table 5 Table 6 Table 7 Table 8 Characteristics Requirements Voltage
30、 drop at rated current at low current See Table 6 Insulation resistance min. 100 M7 Dielectric strength 1500 V on the ground t = (23 5) C (p 55 5) C (125 5) C Leakage current u 1 mA neither flash over nor damage 400 V at 22 000 m t = (23 5) C Tripping points See Table 7 Overload tripping See Table 8
31、 Trip-free release See Table 8, only at 23 C Minimum tripping points at maximum altitude of 22 000 m . 4 000 Pa a No tripping Temperature p 55 C 105 % of I n 23 C 105 % of I n 125 C 80 % of I n Short circuit performance See Table 9 Endurance under no-load and load conditions See Table 10 Endurance u
32、nder overload trip conditions See Table 11 a 100 Pa = 1 mbar Rated current (A) 0,5 1 2 2,5 3 5 7,5 10 15 20 25 Max. voltage drop (V) at I n 2,2 1,10 0,75 0,70 0,55 0,35 0,30 0,30 0,25 0,25 0,20 Max. voltage drop (mV) at low current 100 mA 400 100 25 13 10 8 4 2,5 2,5 2,5 2,5 Rated current A Temperat
33、ure 5 C Load in % of I n Min. tripping point 1 h Max. tripping point 1 h 0,5 to 15 23 C 115 140 0,5 to 25 p 55 C 115 160 20 to 25 125 C 100 140 Temperature 5 C Overload in % of I n 200 500 1 000 23 C p 55 C 125 C Trip out times in s 1,5 to 30 0,15 to 2,5 0,035 to 0,6EN2495:1990 BSI 01-2000 9 Table 9
34、 Table 10 Table 11 5 Designation Each circuit breaker shall be designated as in the following example: Nominal voltage 28 V direct current 115 V alternating current frequency 400 Hz No-load voltage (30 2) V (120 5) V Fault current establishment time u 3 ms u 2,5 ms Circuit breaker rating (0,5 to 25)
35、 A (0,5 to 3) A (5 to 25) A Prospective current 6 000 A L/R 1 ms 1000 A 0,8 u cos u 1 2 000 A 0,8 u cos u 1 Test altitude ground 22 000 m ground 22 000 m ground 22 000 m Number of samples per rating range 1 1 1 1 1 1 Number of tests C0 0C0 1 2 1 2 1 2 1 2 1 2 1 2 For C0, 0C0, see EN 2350 Circuit cha
36、racteristics Number of cycles required no load 28 V direct current 115 V alternating current frequency 400 Hz Close + open At 0,1 A resistive load low current At I nresistive load (M) At I ninductive load L/R = 5 ms (M) At I n(M) inductive load 0,6 u cos u 0,7 Up to I n= 10 A 5 000 2 500 up to I nu
37、5 A 5 000 5 000 5 000 Above I n= 10 A 5 000 2 500 2 500 2 500 Test marked (M) shall be preceded by no-load mechanical endurance test (column 2). Voltages, currents and frequency are toleranced to 5 %. Supply voltage Overload Test conditions Z = 0 t = (23 5) C Z = 22 000 m t = (23 5) C 28 V 1,4 V dir
38、ect current l = 5 I n L/R = 5 ms 15 cycles C0 15 cycles 0C0 20 cycles C0 115 V 5,75 V alternating current, frequency 400 Hz l = 5 I n0,6 u cos u 0,7 15 cycles C0 15 cycles 0C0 20 cycles C0 For C0, 0C0, see EN 2350.EN2495:1990 10 BSI 01-2000 NOTEIf necessary, the originator code I9005 shall be insert
39、ed between the description block and the identity block. 6 Marking See EN 2350. 7 Technical specification See EN 2350.BSEN2495:1991 BSI 01-2000 National appendix NA The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standards Policy Committee
40、 (ACE/-) to Technical Committee ACE/41 upon which the following bodies were represented: British Airways British Aerospace plc British Cable Makers Confederation Ministry of Defence Society of British Aerospace Companies Limited National appendix NB The British Standards corresponding to the Europea
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