ASD-STAN PREN 3774-001-2012 Aerospace series Circuit breakers three-pole temperature compensated rated currents 1 A to 25 A Part 001 Technical specification (Edition P 2).pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 3774-001 Edition P 2 February 2012 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: 49.060 Supersedes

2、 edition P1 of June 1994 and will supersede EN 3774-001:1999Descriptors: ENGLISH VERSION Aerospace series Circuit breakers, three-pole, temperature compensated, rated currents 1 A to 25 A Part 001: Technical specification Srie arospatiale Disjoncteurs tripolaires compenss en temprature, intensits no

3、minales 1 A 25 A Partie 001 : Spcification technique Luft- und Raumfahrt Schutzschalter, dreipolig, temperaturkompensiert, Nennstrme von 1 A bis 25 A Teil 001: Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and D

4、efence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content sh

5、all not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for

6、Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publ

7、ication 29 February 2012 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2012 by ASD-STAN prEN 3774-001:2012 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Terms and definitions .3 4 Description .3 5 Design .4 6 Cha

8、racteristics .5 7 Tests 6 8 Qualification tests 14 9 Quality assurance 18 10 Marking .18 11 Delivery conditions 18 12 Packaging .18 13 Storage 18 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordanc

9、e with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3774-001:2012 (E) 3 1 Scope This standard specifies the three-pole temperature compensated circuit breakers, rated from 1 A to 25 A used in aircraft on-board circuits.

10、It describes specific environmental, electrical and mechanical characteristics and the stringency of tests to be applied according to test methods of EN 3841-100. These circuit breakers are intended for use in aircraft with electrical supplies in accordance with EN 2282. 2 Normative references The f

11、ollowing referenced documents are indispensable 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 2083, Aerospace series Copper or copper alloy condu

12、ctors for electrical cables Product standard EN 2282, Aerospace series Characteristics of aircraft electrical supplies EN 2825, Aerospace series Burning behaviour of non-metallic materials under the influence of radiating heat and flames Determination of smoke density EN 2826, Aerospace series Burni

13、ng behaviour of non-metallic materials under the influence of radiating heat and flames Determination of gas components in the smoke EN 3841-100 (all parts), Aerospace series Circuit breakers Test Methods Part 100: General EN 3844-1, Aerospace series Flammability of non metallic materials Part 1: Sm

14、all burner test, vertical Determination of the vertical flame propagation 1)EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts TR 6083, Aerospace series Cut-outs for installation of electrical components 2)3 Terms and definitions For the purpose

15、s of this document, the terms and definitions given in EN 3841-100 apply. 4 Description These circuit breakers are operated by a “push-pull“ type single push button (actuator) and with delayed action “trip-free“ tripping. Their function is assured up to the short-circuit current. 1) Published as ASD

16、-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). 2) Published as ASD-STAN Technical Report at the date of publication of this standard (www.asd-stan.org). prEN 3774-001:2012 (E) 4 5 Design 5.1 Materials 5.1.1 Metallic materials All metallic parts shall be resistant t

17、o corrosion or finished against corrosion. When dissimilar materials are in close contact, an adequate protection against corrosion shall be used so that the electromotive force of the galvanic couple does not exceed 0,25 V. When bimetals are used, an eventual corrosion shall not affect the good ope

18、ration of the circuit breaker. 5.1.2 Insulation materials The insulating parts shall be made of auto-extinguishing or non-flammable materials; they shall not emit damaging or explosive vapours, even in presence of fire or internal electric arc. They shall be insensitive to moulds and micro-organisms

19、 action. Application of any material or protective coating, which might crack, break on flake shall be forbidden. Materials which are not specified or which are not specially described shall be as light as possible for the requested use. Materials shall be selected according to security criteria (to

20、xicity, smoke density) as defined in contractual documents. 5.2 Design 5.2.1 Insulating box The insulating box shall integrate besides the mechanism, the connection and attachment unit. 5.2.2 Free release mechanism Design of circuit breaker mechanism shall allow free release; i.e. the circuit breake

21、r cuts out in case of overload, and remains cut out even if the actuator is kept by force in engaged position. A new engagement of circuit breaker is only possible after a first total release of the control actuator. The operation in these conditions shall not affect further performances of the circ

22、uit breaker. 5.2.3 Attachment All visible parts shall be black colored and non-reflective. 5.2.4 Electrical connection units They shall be able to receive the lugs. 5.2.5 Control actuator In engaged position, the visible part of the control actuator shall be of the colour stated in the product stand

23、ard. In disengaged (or opened) position, the control actuator shall show a white strip. prEN 3774-001:2012 (E) 5 The outer part of this actuator shall be isolated from all undervoltage parts. The control actuator shall not stay in a transition position, or give a false indication about the circuit b

24、reaker condition. It shall not be removable. When pushing it, power contacts of the circuit breaker engage. When pulling it, power contacts of the circuit breaker open. The circuit breaker rating is indicated in indelible white colour on the front part of the control actuator. The product standard g

25、ives the digits positioning. 5.2.6 Rating inviolability The circuit breaker shall be designed in such a way that the calibration unit cannot be reached without breaking a sealing. 5.2.7 Leakage lines The leakage lines and the minimal space to be foreseen between the undervoltage parts and any other

26、part of the circuit breaker made of non-insulating material, as well as between the undervoltage parts of opposite polarity, shall be sufficient to avoid any default or arcing in all uses and climatic conditions. 5.2.8 Protection against non-release Electrical overload happening on a circuit breaker

27、 locked in its engaged position (sticked contacts or non-operating release mechanism), shall cause the opening of the circuit by circuit breaker destruction without any fire or important smoke release. 6 Characteristics 6.1 General characteristics See Table 1. Table 1 General characteristics Designa

28、tion Requirements Assembly See product standard. Mass See product standard. Operational altitude See product standard. 3 input terminals on power supply side (identified by digit A1, B1, C1) See product standard.3 output terminals on distribution side (identified by digit A2, B2, C2) Operational amb

29、ient temperatures limits From 55 C to 125 C Temperature compensation Rating 1 A to 15 A From 55 C to 125 C See product standard. Rating 20 A and 25 A From 55 C to 90 C Rating marking On control actuator (indelible white) prEN 3774-001:2012 (E) 6 6.2 Ratings See product standard. 6.3 Nominal voltage

30、of operational circuits See product standard. 6.4 Dimensional characteristics See product standard. 6.5 Recommended panel mounting dimensions Panel cut-out : The panel cut-out is in accordance with the designation TR6083C202. Spacing : 50 mm horizontal and 30 mm vertical from the centre of the mount

31、ing holes. Panel thickness : 1 mm to 3 mm. 7 Tests 7.1 Mechanical tests See Table 2. Table 2 Mechanical characteristics Tests Requirements Visual check EN 3841-201 Operational force Closing force (push) EN 3841-502 8 N to 80 N Opening force (pull) 5 N to 30 N Mechanical strength Actuator Travel EN 3

32、841-501 For value, see product standard. Transverse load EN 3841-503 110 N Longitudinal load Push 110 N Pull 110 N Attachment nut Tightening torque EN 3841-504 5 N.m Rotation torque 3 N.m Main contact connection Screw tightening torque EN 3841-505 2 N.m Tensile force as per F1(see Figure 1 in produc

33、t standard). 110 N Pressure force as per F2(see Figure 1 in product standard). 55 N prEN 3774-001:2012 (E) 7 7.2 Environmental tests See Table 3. Table 3 Environmental conditions Tests Requirements Combined tests. Ambient temperature 70 C and vibrations (see notes). Sinusoidal (see Figure 1). Durati

34、on: circuit breaker in the “closed“ position; 0,9 nload Seven cycles/axis 1 octave/min; no load Two cycles/axis 1 octave/min. circuit breaker in the “opened“ position; two cycles/axis 1 octave/min. See EN 3841-506. 5 Hz to 80 Hz Constant amplitude 2 a 0,76 mm 80 Hz to 500 Hz Constant acceleration 10

35、 gn500 Hz to 2 000 Hz Constant acceleration 5 gnRandom (see Figure 2). Duration: circuit breaker in the “closed“ position; 0,9 nload 15 min/axis; no load 15 min/axis. circuit breaker in the “opened“ position; 15 min/axis. 10 Hz to 2 000 Hz Constant acceleration 5,8 gnLow frequencies (see Figure 3).

36、Applicability: see product standard. Duration: circuit breaker in the “closed“ position; 0,9 nload Two cycles/axis; no load Two cycles/axis. circuit breaker in the “opened“ position; two cycles/axis. 10 Hz to 27 Hz to 10 Hz Constant acceleration 10 gn10 Hz to 5 Hz Constant acceleration 3,5 gnCombine

37、d tests. Ambient temperature 85 C, cabin max. altitude 4 600 m and vibrations (see notes). Sinusoidal Applicability: see product standard. Duration: circuit breaker in the “closed“ position; 0,9 nload Four cycles/axis 1 octave/min; no load Two cycles/axis 1 octave/min. circuit breaker in the “opened

38、“ position; two cycles/axis 1 octave/min. See EN 3841-511. 5 Hz to 54 Hz Constant shift 2 a 0,5 mm 54 Hz to 2 000 Hz Constant acceleration 3 gncontinued prEN 3774-001:2012 (E) 8 Table 3 Environmental conditions (concluded) Tests Requirements Mechanical shocks (see notes) 50 gn 11 ms Half sine wave S

39、ee EN 3841-507. Constant accelerations See product standard. Sand and dust See product standard. Corrosion (salt spray) See EN 3841-402, category S. Humidity See EN 3841-403, category A. Explosion-proofing See product standard. Contaminating liquids Cleaning and extinguishing products See EN 3841-40

40、5. Flammability (glow wire test) See EN 3841-406. Inflammability See test EN 3844-1, code B. Smoke density See test EN 2825, code A or code B. Toxicity See test EN 2826, code B. Overvoltage caused by lightning only on main contacts See EN 3841-308. Requirement: no tripping NOTE 1 Vibration tests per

41、formed on circuit breakers in closed position without load and in opened position, are carried out in order to detect contact opening and closure. NOTE 2 For vibration and shock tests, the contact-opening or contact-closure shall be less than or equal to 10 s on the power and the signal contacts. NO

42、TE 3 Shock tests are performed one on each way for each of the three directions (i.e. six shocks in all). NOTE 4 Circuit breaker in the closed position = main contacts closed. Circuit breaker in the opened position = main contacts opened. NOTE 5 Any additional vibration testing (e.g. Sustained Engin

43、e Imbalance) shall be contractually agreed between users and manufacturers. prEN 3774-001:2012 (E) 9 Key 1 Peak to peak amplitude (mm) 2 Frequency (Hz) NOTE The identification G-PK corresponds to peak gnFigure 1 Sinusoidal vibrations prEN 3774-001:2012 (E) 10 Key 1 Spectral density (g2/Hz) 2 Frequen

44、cy (Hz) Figure 2 Random vibrations prEN 3774-001:2012 (E) 11 Key 1 Frequency (Hz) 2 Acceleration level (g) 3 Time (s) NOTE The unit shall operate during application of a vibration on all three axes. The evolution of this vibration is given on the following figures with respect to time. Figure 3 Low

45、frequencies vibrations prEN 3774-001:2012 (E) 12 7.3 Electrical tests See Table 4, Table 5 and Table 6. Table 4 Electrical characteristics Tests Requirements Voltage drop of main contacts at nSee product standard and EN 3841-301. Voltage drop of main contact at low current under 28 V d.c. 100 mA See

46、 product standard and EN 3841-301. Dielectric strength (in V a.c. 50 Hz) Measurement points and voltage values: see product standard. See EN 3841-303. Leakage current 1 mA No breakdown or deterioration Insulation resistance a (on main and signal contacts) See EN 3841-302. 100 M Trip threshold check

47、See product standard and EN 3841-304. Overload trips See product standard and EN 3841-304. “Trip free“ tripping at 2 n, ambient temperature ( 23 5) C See EN 3841-304. Trip time: 2 s to 20 s Short-circuit resistance See Table 6. See product standard and EN 3841-305. No-load and load endurance The end

48、urance test on each circuit breaker tested shall be always performed by, first, the no-load test followed then by one of the load tests at ngiven in the product standard. Test sampling should be sufficient to perform all possible combinations. Only the test for a low current will not be preceded by

49、the no-load test. See product standard and EN 3841-306. Measure and note every (1 000) operations (no-load and load) the voltage drops. Check of behaviour of circuit breakers in case of non-release Test at 10 nand at short-circuit maximum current. See Table 7 and EN 3841-307. aTest points identical to those used for dielectric strength test. prEN 3774-001:2012 (E) 13 Table