1、AECMA STANDARD NORME AECMA AECMA NORM prEN 2996-001 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, three-pole, temperature compensated, rated current 1 A to 25 A Part 001: Technical specification Srie arospatiale Disjoncteurs tripolaires compenss en temprature, intensits nominales 1 A 25 A Partie 001 : Spcification technique Luft- und
3、 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 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 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 2996-001:2005
8、2 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 in AECMA-STANs General Process Manual, this standard has received approval for Publication. Contents Pa
9、ge 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 Delivery conditions. 18 12 Packaging 19 13 Storage 19 Copyright Association Europeene des Constructeurs de Mat
10、eriel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 2996-001:20053 1 Scope This standard specifies the three-pole temperature compensated circuit breakers with signal contacts, polarized or not, rated from
11、1 A to 25 A and used in aircraft on-board circuits. 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 a
12、ccordance with EN 2282 (all categories). 2 Normative references The following 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 amendm
13、ents) applies. EN 2083, Aerospace series Copper or copper alloy conductors 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 an
14、d flames Determination of smoke density. 1)EN 2826 Aerospace series Burning behaviour of non 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, A
15、erospace series Flammability of non metallic materials Part 1: Small burner test, vertical Determination 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
16、 of electrical components. 2)MIL-I-81969/1A, Installing and removal tools, connector electrical 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 thi
17、s document, the terms and definitions given in EN 3841-100 apply. And all its parts quoted. 1) 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),
18、 the Pentagon, Washington D.C. 20301 USA. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 2996-001:20054 4 Description These circuit breakers are
19、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 corrosion. When
20、 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 Insulation
21、 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 microorganisms action. Application of any material or protecti
22、ve 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 contractual
23、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 remains cut o
24、ut 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 visible parts s
25、hall be black colored and non-reflective. 5.2.4 Electrical connection units They shall be able to receive the lugs (or contacts). Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted wi
26、thout license from IHS-,-,-prEN 2996-001:20055 5.2.5 Control actuator In engaged position, the visible part of the control actuator shall be of the color stated in the product standard. In disengaged (or opened) position, the control actuator shall show a white strip. The outer part of this actuator
27、 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 not be removable. When pushing it, power contacts of the circuit breaker engage and indicating contact opens. When pu
28、lling it, power contacts of the circuit breaker open and indicating contact closes. The circuit breaker rating is indicated in indelible white color on the front part of the control actuator. The product standard gives the digits positioning. 5.2.6 Rating inviolability The circuit breaker shall be d
29、esigned 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 part of the circuit breaker made of non-insulating material, as well as between the un
30、dervoltage 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 overload happening on a circuit breaker locked in its engaged position (sticked contacts or non-operating release mecha
31、nism), 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. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot f
32、or ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 2996-001:20056 Table 1 General characteristics Designation Requirements Assembly See product standard. Mass See product standard. Operational altitude See product standard. Power contact connection 3 input terminals o
33、n power supply side (identified by digit A1, B1, C1) 3 output terminals on distribution side (identified by digit A2, B2, C2) See product standard. Signal contact connection, circuit closed when circuit breaker is released Crimp contacts size 20 See product standard. Operational ambient temperatures
34、 limits From 55 C to 125 C Rating 1 A to 15 A From 55 C to 125 C Temperature compensation Rating 20 A and 25 A From 55 C to 90 C See product standard. Rating marking On control actuator (indelible white) 6.2 Ratings See product standard. 6.3 Nominal voltage of main contacts See product standard. 6.4
35、 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 used 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 signall
36、ing 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 signalization circuit (contact and diode), the reception electrical test could be performed without exceeding the value recommended of 60 mW max. at
37、 28 V d.c. max. (resistive load). Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 2996-001:20057 6.5 Dimensional characteristics See product stand
38、ard. 6.6 Recommended panel mounting dimensions Panel cut-out : The panel cut-out is in accordance with the designation TR6083C202. Spacing : 50 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 M
39、echanical tests Tests Requirements Visual check See EN 3841-201. Closing force (push) 8 N to 80 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-
40、503. 110 N Tightening torque 5 N.m Attachment nut Rotation 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 produc
41、t standard. Insertion force Insertion possible without 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:
42、 MIL-I-81969/14-11 - metallic: MIL-I-81969/1-02 See MIL-I-81969/1A and MIL-I-81969/14C. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 2996-001:2
43、0058 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 the “closed“ position; - 0,9 nload - Seven cycles/axis
44、 - 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 “closed“ position; - 0,9 nload - 15 min/axis; - no load -
45、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 frequencies (see Figure 3). Applicability: see produc
46、t 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 gn5 Hz to 54 Hz - Constant shift2 a = 0,5 mm Combined
47、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
48、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. Sand and dust See product standard. continued Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-prEN 2996-001:20059 Table 4 - Environmental conditions (concluded) Tests Requirements Corrosion (salt s
