1、BRITISH STANDARD BS EN 2350:1991 Circuit breakers Technical specification This European Standard EN 2350:1990 has the status of a British StandardBSEN 2350:1991 This British Standard was published under the authority ofthe Standards Board and comesinto effect on 31 May 1991 BSI 12-1999 The following
2、 BSI references relate to the work on this standard: Committee reference ACE/41 Draft for comment 88/73786 DC ISBN 0 580 19395 0 Cooperating organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organiz
3、ations of the following Western European countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V.
4、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 Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardi
5、seringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date
6、CommentsBSEN2350:1991 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Brief history 2 Text of EN 2350 3 National appendix NA Inside back cover National appendix NB Inside back coverBSEN 2350:1991 ii BSI 12-1999 National foreword This British Standard has
7、 been prepared under the direction of the Aerospace Standards Policy Committee and is the English language version of EN 2350 “Aerospace series Circuit breakers Technical specification”, published by the European Committee for Standardization (CEN). EN 2350 was produced as a result of international
8、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 Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obliga
9、tions. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the am
10、endment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2350 September 1990 UDC: 621.316.57:629.7 Key words: Aircraft industry, aircraft equipment, circuit breaker, manufacturing requirement, specification, test, testing condition, environment, marking. English v
11、ersion Aerospace series Circuit breakers Technical specification Srie arospatiale Disjoncteurs Spcification technique Luft- und Raumfahrt Schuzschalter Technische Lieferbedingungen This European Standard was accepted by CEN on 10 January 1990. CEN members are bound to comply with the requirements of
12、 the CEN Internal Regulations which stipulate the 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
13、 to any CEN member. This European Standard exists 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 versi
14、ons. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Norm
15、alisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1990 Copyright reserved to all CEN members Ref. No. EN 2350:1990 EEN2350:1990 BSI 12-1999 2 Brief history This European Standard has been prepared by the European Association of Aerospace Manufactur
16、ers (AECMA). After inquiries and votes carried out 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
17、 CEN/CENELEC Rules, the following countries are bound 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 Sco
18、pe and field of application 3 2 References 3 3 Definitions 3 4 Design 3 5 Tests Requirements Procedures Evaluation 4 6 Qualification 11 7 Periodic tests to maintain qualification 13 8 Acceptance 14 9 Marking 14 Figure 1 10 Table 1 4 Table 2 8 Table 3 12 Table 4 13 Table 5 13 Table 6 14EN2350:1990 BS
19、I 12-1999 3 1 Scope and field of application 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 ISO 2669, Environmental tests for aircraft equipment Part 3.2:
20、Steady state acceleration. ISO 2859:1974, Sampling procedures and tables for inspection by attributes. ISO 7137, Aircraft Environmental conditions and test procedures for airborne equipment. IEC 50 (441), International electrotechnical vocabulary Chapter 441: Switchgear, controlgear and fuses. EN 20
21、00, Aerospace series Quality assurance EN aerospace products Approval of the quality system of manufacturers. MIL-A-8243D, Anti-icing and deicing Defrosting fluid 1) . MIL-H-5606E, Hydraulic fluid, petroleum base, aircraft, missile and ordnance 1) . MIL-L-23699C, Lubricating oil, aircraft turbine en
22、gine, synthetic base 1) . MIL-C-25769J, Cleaning compound, aircraft surface, alkaline waterbase 1) . MIL-L-7808J, Lubricating oil, aircraft turbine engine, synthetic base 1) . MIL-L-7870A, Lubricating oil, general purpose, low temperature 1) . MIL-G-5572F, Gasoline aviation grades 80/87, 100/30, 115
23、/145 1) . MIL-H-83282C, Hydraulic fluid, fire resistant, synthetic hydrocarbon base, aircraft, metric 1) . SAE AS 1241A, Fire resistant phosphate ester hydraulic fluid for aircraft 2) . 3 Definitions Circuit breaker with trip-free release: A circuit breaker in which the open commandtakes precedence
24、over the close command, i.e. when the electrical trip condition is reached and pressure is exerted on the depressed actuator button, the circuit is still automatically opened. Poles of a circuit breaker: A circuit breaker pole denotes any main circuit from the input to the pertinent output terminal.
25、 The parts of each current path (contact, sensors, switching parts) are independent and electrically insulated. There may be 1, 2 or 3 poles independently of any auxiliary circuits. Current rating (I n ): The current rating (I n ) of a circuit breaker is the current in ampres for which the circuit b
26、reaker has been designed and designated. Trip characteristics 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. Indicati
27、on of current and voltage values Unless otherwise specified, the a.c. voltage and a.c. values shown are r.m.s. values. For other definitions, see IEC 50 (441). 4 Design 4.1 Insulating housing In addition to the switching mechanism, the insulating housing shall incorporate the connecting and mounting
28、 systems. 4.2 Trip-free 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 releas
29、e of the actuator button. 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
30、. 1) This specification is published by: Department of Defense (DOD), the Pentagon, Washington, D.C. 20301. 2) This standard is published by: Society of Automotive Engineers, Inc. (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001.EN2350:1990 4 BSI 12-1999 4.3 Mounting All visible parts shall
31、be black and non-reflective. 4.4 Electrical connection components These shall be suitable to fit the cable lugs (or contacts). 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
32、of this button shall be insulated 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 act
33、uator button. The circuit breaker contacts shall be opened by pulling the actuator button. The current rating of the circuit breaker shall be indicated indelibly in white colour on the top of the actuator button. Arrangement of the digits is indicated in the product standard. 4.6 Calibration safety
34、device The circuit breaker shall 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 bet
35、ween live parts of opposite 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 f
36、ungus growth and the effects 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 shal
37、l be protected against electrochemical corrosion. Where bimetals are used, any corrosion which may occur shall not affect the proper function of the circuit breaker. 4.10 Fasteners Screws and nuts shall be locked so that the connections cannot be damaged. 5 Tests Requirements Procedures Evaluation 5
38、.1 General 5.1.1 Unless otherwise indicated, measurement conditions are as follows: Ambient temperature (23 5) C Pressure (840 to 1 070) hPa 3) Relative humidity u 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
39、 mm thick. 5.1.3 For thermal tests the circuit 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
40、 several circuit breakers or the poles of multi-pole circuit breakers are connected in series, the connecting cable between the circuit breakers or poles shall be 2 0,5 m long. The cable lugs used shall be compatible with the circuit breaker terminals. Table 1 5.2 Mechanical tests 5.2.1 Visual inspe
41、ction It shall be performed without magnification. It concerns: General appearance (surface finish, colour, assembly) Conformity and quality of markings and inscriptions Undamaged condition of calibration seal 3) 1 hPa = 1 mbar Current rating A Cross section mm 2 Corresponding AWG aCross section Up
42、to 1 0,6 20 1,5 to 6 1 18 7to 10 1,2 16 11to 15 2 14 16to 20 3 12 21to 25 5 10 26to 40 9 8 41to 50 14 6 a American Wire GaugeEN2350:1990 BSI 12-1999 5 After climatic environmental tests, inspection of all parts which may show corrosion or poor legibility of the markings. 5.2.2 Dimensions and masses
43、These shall conform to the requirements of the product standard and shall be checked using normal measuring instruments. 5.2.3 Actuating components 5.2.3.1 Actuator button travel With the circuit breaker in the closed and open positions the dimensions of the end of the actuating button in relation t
44、o the mounting surface is measured, parallel to its longitudinal axis (direction of travel). This measurement is performed 3 times, with 1 mechanical switching operation between each measurement. The mean values of the measurements recorded shall lie within the tolerances specified in the product st
45、andard. 5.2.3.2 Operating force The force required to switch on and off shall be measured with a suitable gauge in the line of travel of the actuator button. The measurement shall be taken 3 times in each direction. The mean value of the measurements shall lie within the limits indicated in the prod
46、uct standard. 5.2.3.3 Strength of actuating components Transverse load The push button 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 e
47、ach in the 4 main directions. Longitudinal load The push button shall be subjected 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 of Table 4. 5.2.4 Strengt
48、h of mounting Mounting The tightening torque specified in the product standard shall be applied 3 times for 1 minute each, with 1 disassembly between each operation. Rotation The circuit breaker housing shall be turned around its mounting in both directions successively at the torque specified in th
49、e product standard. No deformation outside tolerances or rupture of the locating device shall result. The circuit breaker housing shall not break. Evaluation Verification tests A + E + F + C of 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 loosened. This test shall be carried out 5 times. No deteri
