1、AECMA PREN*K2350 89 LOL23LL 0007854 2 i-; prEN 2360 A.E.C.M.A. STANDARD Edition 1 NORME A.E.C.M.A. A.E.C.M.A. NORM January 19EB - EDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MASRIEL AEROSPATIAL 88. boulevard Malerherber. 76008 PARIS -TEL 46.63-82-86 UDC : 621.31 6.67 : 629.7 Key words : A
2、ircraft industry, aircraft equipment, circuit breaker, msnufecturlng requirement, specification, test, testing condition, environment, marking. ENOLISH VERSION Aerospacb series Circuit bmaken Technical 8p;ecification Srie e6rospatlale Disjoncteurs Spcification technique Luft- und Raumfahrt Schutzsch
3、alter technlrche Lleferbedlngungen . Ths .Aerospace series. standardhas been drawn up under the rasponribility of AECMA (Association Europenne des Constructeurs de Matriel Arospetiall. It it published on yellow paper n three equivalent versions (English. French, Gernfan). It will be submined as a dr
4、af European Standard to CEN (European Committee for Standardization) for final voie. .- The equivalent version8 in Frencb German languigo8 can e MfrO.V8lh1rf It - FRANCE /il nwmn la- Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot
5、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN82350 89 I 10L23LL 0007855 4 0 prEN 2350 Page 2 CONTENTS 1 Scope and fleld of appllcatlon 2 References 3 Def In1 tlons 4 Deslgn 5 Tests - Recplrements - Procedures -I Evaluation 6 Qual If Icatlon 7 Perlodlc tes
6、ts to malntain quallflcation 8 Acceptance 9 Marking 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-,-,-AECMA PREN*Z350 89 E 1012311 0007856 b T 1 Scope an
7、d field of application prEN 2350 Page 3 This standard gives design information and specifies test methods for aircraft circuit breakers covered by EN standards. It is applicable if it is referred to in these standards. 2 References IS0 2669 IS0 2859-1974 IS0 7137 IEC Publication 50 EN 2000 MIL-A-824
8、3D MIL-H-5606E MIL-L-23699C M I L-C- 2 5769 J MI L- L-78085 MIL-L-7870A MIL-G-5572F MI L-H-83282C SAE AS 1241 3 Definitions - Environmental tests for aircraft equipment - Part 3.2 : Steady state acceleration Sampling procedures and tables for inspection by attributes Aircraft - Environmental conditi
9、ons and test procedures for airborne equipment International electrotechnical vocabulary Chapter 441 : Switchgear, controlgear and fuses Aerospace series - Quality assurance requirements for the manufacture and procurement of EN aerospace standard products Anti-icing and deicing - Defrosting fluid H
10、ydraulic fluid, petroleum base, aircraft, missile, and ordnance Lubricating oil, aircraft turbine engine, synthetic base Cleaning compound, aircraft surface, alkaline waterbase Lubricating oil, aircraft turbine engine, synthetic base Lubricating oil, general purpose, low temperature Gasol i ne avi a
11、t i on grades 80/87 , 100/30, 115/145 Hydraulic fluid, fire resistant, synthetic hydrocarbon base, aircraft, metric - Fire resistant phosphate ester, hydraulic fluid for aircraft - Circuit breaker with “trip-free release“ : A circuit breaker in which the “open“ command takes precedence over the “clo
12、se“ command, i.e when the electrical trip condition is reached and pressure is exerted on the depressed actuator button, the circuit is sti 11 automatically opened. - Poles of a circuit breaker A circuit breaker pole denotes any main circuit from the input to the pertinent output termi na1 . Copyrig
13、ht Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN*Z350 89 LOL231L 0007857 8 S prEN 2350 Page 4 The parts of each current path (contacts, sensors, swi
14、tching parts) are independent and electrically isolated. There may be 1, 2 or 3 poles independently of any auxiliary circuits. - Current rating (In) : The current rating (In) of a circuit breaker is the current in amperes for which the circuit breaker has been designed and designated. Trip character
15、istics and test values are based on the current rating. - Voltage ratings : Voltage ratings are the voltage levels in volts for which the circuit breaker is designed. Insulation values and test voltages are related to these rated voltages. - Indication of current and voltage values Unless otherwise.
16、 specified, the a.c. voltage and a.c. current values shown are r.m.s. values. For other definitions, see IEC Publication 50 - Chapter 441. 4 Design 4.1 Insulating housing In addition to the switching mechanism, the insulating housing shall incorporate the connecting and mounting systems. 4.2 Trip-fr
17、ee mechanism The circuit breaker shall be designed to permit trip-free release, i.e. so that it is switched off at overload and remains switched off even when the button is held in the closed position. Resetting of the circuit breaker shall be possible only after complete release of the actuator but
18、ton. In no case shall operation under these conditions affect the further serviceability of the circuit breaker. All poles of a multi-pole circuit breaker shall trip on single or multi-phase overload. The time lag between opening of the first and last pole shall not exceed 10 ms. 4.3 Mounting All vi
19、sible parts shall be black and non-reflective. 4.4 Electrical connection components These shall be suitable to fit the cable lugs (or contacts). Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networki
20、ng permitted without license from IHS-,-,-I AECMA PREN*2350 89 1012311 0007858 T I prEN 2350 page 5 4.5 Actuator button In the closed position the visible part of the actuator button shall be black. In the “off“ (open) position a white strip shall be exposed. The outer part of this button shall be i
21、nsulated from all live parts. In no case shall the actuator button remain in an intermediate position or give an incorrect indication of the switching condition of the circuit breaker. It shall not be removable. - The circuit breaker contacts shall be closed by pushing the actuator button. - The cir
22、cuit breaker contacts shall be opened by pulling the actuator button. The current rating of the circuit breaker shall be indicated indelibly in white on the top of the actuator button. Arrangement of the digits is indicated in the product standard. 4.6 Calibration safety device The circuit breaker s
23、hall be designed in such a way that the calibration cannot be interfered with without breaking a seal. 4.7 Leakage paths Leakage paths and the minimum distance to be observed between live parts and all other parts of the circuit breaker in non-insulating materials and between live parts of opposite
24、polarity shall be sufficient to avoid damage and spark- over under all operating and ambient conditions. 4.8 Insulants Insulating parts shall be of non-inflammable or self-extinguishing materials and shall not emit noxious or explosive vapours. They shall be resistant to fungus growth and the effect
25、s of micro-organisms. Protective coatings and materials which may chip, crack or shatter shall not be used. 4.9 Protection against corrosion All metal parts shall be either resistant to or protected against corrosion, In case of contact between dissimilar metals they shall be protected against elect
26、rochemical corrosion. Where bimetals are used, any corrosion which may occur shall not affect the proper function of the circuit breaker. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking perm
27、itted without license from IHS-,-,-AECMA PREN*Z350 89 E 1012311 0007859 II E prEN 2350 Page 6 4.10 Fasteners Screws and nuts shall be so locked that the connections cannot be damaged. 5 Tests - Requirements 5.1 General 5.1.1 Un1 ess ot herwi se Ambient temperature 23 - Procedures - Evaluation indica
28、ted, measurement conditions are as fol lows : t 5“ c _ . - -_ - _- -* _ Pressure 840 to 1 070 hPa (1) Relative humidity 5 85 % 5.1.2 Mechanical tests shall be carried out with the circuit breakers mounted in their normal position on a metal holder at least 2 mm thick. 5.1.3 For thermal tests the cir
29、cuit breakers shall be mounted with the minimum distance between each other as specified in the product standard. 5.1.4 For electrical tests the circuit breakers shall be connected to cables as shown in table 1. The cables shall be at least 0,5 m long. Where several circuit breakers or the poles of
30、multi-pole circuit breakers are connected in series, the connecting cable between the circuit breakers or poles shall be 2 x 0,5 m long. The cable lugs used shall be compatible with the circuit breaker terminals. Table 1 Current rating A up to 1 1,5 to 6 7 to 10 11 to 15 16 to 20 21 to 25 26 to 40 4
31、1 to 50 Cross section mm2 3 5 9 14 Corresponding AWG *) Cross section - 20 18 16 14 12 10 8 6 *) American Wire Gauge 1) 1 hPA = 1 mbar Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitt
32、ed without license from IHS-,-,-AECMA PRENm2350 89 1012311 0007860 8.1 y prEN 2350 Page 7 5.2 Mechani cal tests 5.2.1 Visual inspection It shall be performed without magnification. It concerns : - General appearance (surf ace fi ni sh, colour, assembly) - Conformity and quality of markings and inscr
33、iptions - Undamaged condition of calibration seal - After climatic environmental tests, inspection of all parts which may show corrosion or poor legibility or markings. 5.2.2 Dimensions and masses These shall conform to the requirements of the product standard and shall be checked using normal measu
34、ring instruments. 5.2.3 Actuating components 5.2.3.1 Actuator button travel With the circuit breaker in the closed and open positions the dimension of the end of the actuating button in relation to the mounting surface is measured, parallel to its longitudinal axis (direction of travel). This measur
35、ement is performed three times, with one mechanical switching operation between each measurement. The mean values of the measurements recorded shall lie within the tolerances specified in the product standard. 5.2.3.2 Operating force The force required to switch “on“ and itoff“ shall be measured wit
36、h a suitable gauge in the line of travel of the actuator button. The measurement shall be taken three times in each direction. The mean value of the measurements shall lie within the limits indicated in the product standard. 5.2.3.3 Strength of actuating components - Transverse load The push button
37、in the closed and open position shall be subjected to the load specified in the product standard at the end (rim) of the button, perpendicularly to the direction of travel. The load shall be applied for 1 minute each in the four main directions. - Longitudinal load The push button shall be subjected
38、 to the force specified -in the product standard, for 1 minute each in the push and pull directions. No damage shall be caused by the loads applied. Evaluation : Verification tests A + E + F + C in table 4. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS und
39、er license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN*Z350 89 I LOL23LL 08078bE T m prEN 2350 Page 8 5.2.4 Strength of mounting - Mounting The tightening torque specified in the product standard shall be applied 3 times for 1 minute each,
40、with one disassembly included. - Rotation The circuit breaker housing shall be turned around its mounting in both directions successively at the torque specified in the product standard. No deformation outside tolerances or rupture of the locating device shall result. The circuit breaker housing sha
41、ll not break. - Evaluation Verification tests : A + E + F + C in table 4. 5.2.5 Strength of connections - Tightening torque The connection screws shall be tightened to the torque specified in the product standard. This torque shall be maintained for 1 minute. The connection screws shall then be loos
42、ened. This test shall be carried out five times. No deterioration of the connections shall result. There shall be no breakage of the circuit breaker housing. - Strength of connections Each of the contact lugs (or terminals) shall be subjected to the forces indicated in the product standard. The-forc
43、es shall be maintained for 1 minute and shall not lead to deterioration of the connections. The circuit breaker housing shall not break. - Evaluation - - - _-.- _ - - - - - Verification tests A + C in table 4. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS
44、under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PRENx2350 89 L0123Ll 0007862 L I: 5.3 Environmental tests 5.3.1 Vi brat i on perf ormance - Mounting shall be designed so as to transmit the vibrations over the wh range without absorptio
45、n or natural resonance. The electrical connection shall be made with cables of the se in table 1. The connection cables shall be attached approx. termi na1 s. - Procedure The circuit breakers shall be subjected to the sinusoidal wave test to IS0 7137. The test shall be carried out in 3 mounting posi
46、tions along the circuit breaker, at ambient temperature, in the closed and The values shall conform to the limits specified in the product - Total vibration time per direction : in the closed position : 2 hours, circuit breaker load 90 % 1, in the open position : 1 hour. determined as follows : - re
47、sonance : if applicable - 30 min per resonance - sweep During the test it shall be established that the contacts do period equal to or greater than 10 ps (circuit breaker in the O open for a period equal to or greater than 10 ps (circuit-break position). - Evaluation Verification tests A + D + G + C
48、 to table 4. 5.3.2 Mechanical shocks - Mounting m I : remainder of total time specified. e vibration. the terminals. I Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without licen
49、se from IHS-,-,-AECMA PRENm2350 89 I LOL231iL 0007863 3 I prEN 2350 Page 10 - Procedure The circuit breakers shall be subjected to the mechanical shock test to IS0 7137. 3 shocks shall be applied in each direction and for each switch setting (at ambient temperature) : - in the closed position at 90 % of current rating - in the open position. The acceleration peak value (h
