1、AECMA STANDARD NORME AECMA AECMA NORM prEN 2995-001 Edition P 3 May 2005 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION Gulledelle 94 - B-1200 Brussels - Tel. + 32 2 775 8110 - Fax. + 32 2 775 8111 - www.aecma-stan.orgICS: 49.060 Supersedes edition P 2 January 1999 D
2、escriptors: ENGLISH VERSION Aerospace series Circuit breakers, single-pole, temperature compensated, rated current 1 A to 25 A Part 001: Technical specification Srie arospatiale Disjoncteurs unipolaires compenss en temprature, intensits nominales 1 A 25 A Partie 001 : Spcification technique Luft- un
3、d Raumfahrt Schutzschalter, einpolig, Temperaturkompensiert, Nennstrme von 1 A bis 25 A Teil 001: Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is publ
4、ished 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 shall not be changed to an extent that interchangeability is affected, p
5、hysically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of AECMA-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European
6、 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 publication 31 May 2005 Comments should be sent within six months after
7、the date of publication to AECMA-STAN Electrical Domain Copyright 2005 by AECMA-STAN prEN 2995-001:20052 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of AECMA-STAN defined
8、in AECMA-STANs General Process Manual, this standard has received approval for Publication. Contents Page 1 Scope 3 2 Normative references. 3 3 Terms and definitions 3 4 Description. 4 5 Design 4 6 Characteristics. 5 7 Tests 7 8 Qualification tests 15 9 Quality assurance 18 10 Marking. 18 11 Deliver
9、y conditions. 18 12 Packaging 19 13 Storage 19 prEN 2995-001:20053 1 Scope This standard specifies the single-pole temperature compensated circuit breakers with signal contacts, polarized or not, rated from 1 A to 25 A and used in aircraft on-board circuits. It describes specific environmental, elec
10、trical 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 (all categories). 2 Normative references The following referenced docu
11、ments 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 conductors for electrical cab
12、les 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. 1)EN 2826 Aerospace series Burning behaviour of non
13、metallic materials under the influence of radiating heat and flames Determination of gas components in the smoke. 1)EN 3841-100, Aerospace series Circuit breakers Test Methods Part 100: General. EN 3844-1, Aerospace series Flammability of non metallic materials Part 1: Small burner test, vertical De
14、termination of the vertical flame propagation.1)EN 9133, Aerospace series Quality management systems Qualification Procedure for Aerospace Standards Parts. TR 6083, Aerospace series Cut-outs for installation of electrical components. 2)MIL-I-81969/1A, Installing and removal tools, connector electric
15、al contact, type III, class 2, composition C. 3)MIL-I-81969/14C, Installing and removal tools, connector electrical contact, type III, class 2, composition B.3)3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 3841-100 apply. And all its parts quoted. 1
16、) Published as AECMA Prestandard at the date of publication of this standard. 2) Published as AECMA Technical Report at the date of publication of this standard. 3) Published by: Department of Defense (DOD), the Pentagon, Washington D.C. 20301 USA. prEN 2995-001:20054 4 Description These circuit bre
17、akers 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. 5 Design 5.1 Materials 5.1.1 Metallic materials All metallic parts shall be resistant to corrosion or finished against corro
18、sion. 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 operation of the circuit breaker. 5.1.2
19、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 action. Application of any material
20、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 (toxicity, smoke density) as defined in
21、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 breaker cuts out in case of overload, and r
22、emains 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 circuit breaker. 5.2.3 Attachment All vis
23、ible parts shall be black coloured and non-reflective. prEN 2995-001:20055 5.2.4 Electrical connection units They shall be able to receive the lugs (or contacts). 5.2.5 Control actuator In engaged position, the visible part of the control actuator shall be of the colour stated in the product standar
24、d. In disengaged (or opened) position, the control actuator shall show a white strip. 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 breaker condition. It shall
25、not be removable. When pushing it, power contacts of the circuit breaker engage and indicating contact opens. When pulling it, power contacts of the circuit breaker open and indicating contact closes. The circuit breaker rating is indicated in indelible white colour on the front part of the control
26、actuator. The product standard gives 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 u
27、ndervoltage parts and any other 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 arc tracking in all uses and climatic conditions. 5.2.8 Protection against non-release Electrical o
28、verload happening on a circuit breaker 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. p
29、rEN 2995-001:20056 Table 1 General characteristics Designation Requirements Assembly See product standard. Mass See product standard. Operational altitude See product standard. Power contact connection 1 input terminal on power supply side (identified by digit 1) 1 output terminal on distribution si
30、de (identified by digit 2) See product standard.Signal contact connection, circuit closed when circuit breaker is on release Crimp contacts size 20 See product standard. Operational ambient temperatures limits From 55 C to 125 C Temperature compensation From 55 C to 125 C See product standard. Ratin
31、g marking On control actuator (indelible white) 6.2 Ratings See product standard. 6.3 Nominal voltage of main contacts See product standard. 6.4 Signal contact performances See Table 2. Table 2 Signal contact performances Type of load 28 V d.c. 5 V d.c. 5 V a.c. a28 V d.c. Resistive 0,5 A 3 mA Not u
32、sed 3 mA Signal contact Lamp 0,2 A Not used 0,23 A Not used aApplicable on version without diode only. NOTE 1 The circuit breaker status signalling function, open or closed shall be guaranteed after all the tests described in this specification. NOTE 2 In order to avoid any deterioration of the sign
33、alization circuit (contact and diode), the reception electrical test could be performed without exceeding the value recommended of 60 mW max. at 28 V d.c. max. (resistive load). 6.5 Dimensional characteristics See product standard. prEN 2995-001:20057 6.6 Recommended panel mounting dimensions Panel
34、cut-out : The panel cut-out is in accordance with the designation TR6083C202. Spacing : 20 mm horizontal and 40 mm vertical from the centers of the mounting holes. Panel thickness : 1 mm to 3 mm. 7 Tests 7.1 Mechanical tests See Table 3. Table 3 Mechanical tests Tests Requirements Visual check See E
35、N 3841-201. Closing force (push) 3,5 N to 45 N Operational force Opening force (pull) See EN 3841-502. 5 N to 30 N Travel See EN 3841-501. For value, see product standard. Transverse load 110 N Push 110 N Actuator Longitudinal load Pull See EN 3841-503. 110 N Tightening torque 5 N.m Attachment nut R
36、otation torque See EN 3841-504. 3 N.m Screw tightening torque 2 N.m Tensile force as per F1(see Figure 1 in product standard). 110 N Main contact connection Pressure force as per F2(see Figure 1 in product standard). See EN 3841-505. 55 N See product standard. Insertion force Insertion possible with
37、out tools 6 N Extraction force See EN 3841-509. 15 N Contact retention force (pre-load 13,5 N) See EN 3841-510. 67 N shift 0,3 mm Radial load See EN 3841-510. 30 N Mechanical strength Signal contact connection (size 20) Recommended tools: - plastic: MIL-I-81969/14-11 - metallic: MIL-I-81969/1-02 See
38、 MIL-I-81969/1A and MIL-I-81969/14C. prEN 2995-001:20058 7.2 Environmental tests See Table 4. Table 4 Environmental conditions Tests Requirements 5 Hz to 80 Hz - Constant amplitude 2 a = 0,76 mm 80 Hz to 500 Hz - Constant acceleration = 10 gnSinusoidal (see Figure 1). Duration: circuit breaker in th
39、e “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. 500 Hz to 2 000 Hz - Constant acceleration = 5 gnRandom (see Figure 2). Duration: circuit breaker in the “close
40、d“ 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 gn10 Hz to 27 Hz to 10 Hz - Constant acceleration = 10 gnCombined tests Ambient temperature 70 C and vibrations (see notes). Low f
41、requencies (see Figure 3). 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. See EN 3841-506. 10 Hz to 5 Hz - Constant acceleration = 3,5 gn
42、5 Hz to 54 Hz - Constant shift2 a = 0,5 mm Combined 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 -
43、 Two cycles/axis - 1 octave/min. circuit breaker in the “opened“ position; - Two cycles/axis - 1 octave/min. See EN 3841-511. 54 Hz to 2 000 Hz - Constant acceleration = 3 gnMechanical shocks (see notes) 50 gn- 11 ms - half sine wave. See EN 3841-507. Constant accelerations See product standard. San
44、d and dust See product standard. continued prEN 2995-001:20059 Table 4 - Environmental conditions (concluded) Tests Requirements 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 extingu
45、ishing products. See EN 3841-405. Flammability (glow wire test) See EN 3841-406. Inflammability See test EN3844-1B. Smoke density See test EN2825A or B. Toxicity See test EN2826B. Overvoltage caused by lightning only on main contacts See EN 3841-308. Requirement: no tripping. NOTE 1 Vibration tests
46、performed 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.
47、 NOTE 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 and auxiliary contacts opened. Circuit breaker in the opened position = main contacts opened and auxiliary contacts closed
48、. NOTE 5 Any additional vibration testing (e.g. Sustained Engine Imbalance) shall be contractually agreed between users and manufacturers. prEN 2995-001:200510 Key 1 Peak to peak amplitude in mm 2 Frequency in Hz NOTE The identification G-PK corresponds to peak gn Figure 1 Sinusoidal vibrations prEN
49、 2995-001:200511 Key 1 Spectral density (g2/Hz) 2 Frequency in Hz Figure 2 Random vibrations prEN 2995-001:200512 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 frequencies vibrations prEN 2995-001:200513 7.3 Electrical tests See Table 5, Table 6 and Table 7. Table 5 El
