1、BSI Standards PublicationBS EN 2794-004:2014Aerospace series Circuitbreakers, single-pole,temperature compensated,rated currents 20 A to 50 APart 004: UNC thread terminals ProductstandardBS EN 2794-004:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 2794-00
2、4:2014.It supersedes BS EN 2794-004:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/6, Aerospace avionic electrical and fibre optictechnology.A list of organizations represented on this committee can beobtained on request to its secretary.This
3、publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 83446 2ICS 49.060Compliance with a British Standard cannot confer immunity
4、 fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2014.Amendments issued since publicationDate Text affectedBS EN 2794-004:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2794-004 January 2014 ICS 49.06
5、0 Supersedes EN 2794-004:1999English Version Aerospace series - Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A - Part 004: UNC thread terminals - Product standard Srie arospatiale - Disjoncteurs unipolaires compenss en temprature, intensits nominales 20 A 50 A -
6、Partie 004: Bornes filetage UNC - Norme de produit Luft- und Raumfahrt - Schutzschalter, einpolig, temperaturkompensiert, Nennstrme von 20 A bis 50 A - Teil 004: UNC-Klemmengewinde - Produktnorm This European Standard was approved by CEN on 28 September 2013. CEN members are bound to comply with the
7、 CEN/CENELEC 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-CENELEC Management
8、 Centre or 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 the CEN-CENELEC Management Centre has the same status a
9、s the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Ne
10、therlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All
11、rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2794-004:2014 EBS EN 2794-004:2014EN 2794-004:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Dimensions and mass .4 4.1 Dimensional charac
12、teristics .4 4.2 Electrical diagram 5 4.3 Mass 6 4.4 Panel cut-out 6 5 Characteristics .6 5.1 Material, surface treatment .6 5.2 Mechanical characteristics .6 5.2.1 Fasteners 6 5.2.2 Recommended tightening torque of attaching nut for installation 6 5.2.3 Recommended tightening torque of connection h
13、ardware for installation.7 5.2.4 Resistance to vibrations .7 5.2.5 Resistance to shocks 7 5.2.6 Mechanical endurance 7 5.3 Environment characteristics 7 5.3.1 Humidity 7 5.3.2 Corrosion 7 5.3.3 Contaminating liquids .7 5.3.4 Overvoltage caused by lightning .7 5.4 Electrical characteristics 7 5.4.1 N
14、ominal voltage of operational circuits 7 5.4.2 Voltage drop at n.8 5.4.3 Minimum and maximum tripping thresholds 8 5.4.4 Overload trip .8 5.4.5 Short-circuit values .9 5.4.6 No-Load and load endurance .9 5.4.7 Dielectric rigidity 9 5.4.8 Insulation resistance .9 6 Designation . 10 7 Rated current co
15、de . 10 8 Delivery hardware code . 10 9 Marking 11 10 Technical specification 11 BS EN 2794-004:2014EN 2794-004:2014 (E) 3 Foreword This document (EN 2794-004:2014) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes
16、 carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, eit
17、her by publication of an identical text or by endorsement, at the latest by July 2014, and conflicting national standards shall be withdrawn at the latest by July 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CE
18、NELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 2794-004:1999. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Bel
19、gium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switz
20、erland, Turkey and the United Kingdom. BS EN 2794-004:2014EN 2794-004:2014 (E) 4 1 Scope This European Standard specifies the characteristics of single-pole circuit breakers, temperature compensated with a rated current from 20 A to 25 A, used in aircraft on-board circuits at a temperature between 5
21、5 C and 125 C and at an altitude of 15 000 m max. These circuit breakers are operated by a push-pull type single push button (actuator), with delayed action “trip-free” tripping. They will continue to function up to the short-circuit current. 2 Normative references The following documents, in whole
22、or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2350, Aerospace series Circuit breaker
23、s Technical specification EN 2794-001, Aerospace series Circuit breakers, single-pole, temperature compensated, rated currents 20 A to 50 A Part 001: Technical specification EN 3841-305, Aerospace series Circuit breakers Test methods Part 305: Short-circuit performance EN 6113, Aerospace series Circ
24、uit breaker, connecting and attachment hardware 1)TR 6083, Aerospace series Cut-outs for installation of electrical components 2)FED-STD-595B, Colors used in Government Procurement 3)3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 2350 apply. 4 Dimens
25、ions and mass 4.1 Dimensional characteristics The circuit breakers do not have to correspond to the pictorial illustration, only the dimensions given shall be adhered to. Dimensions are in millimetres with exception terminal thread 8-32 UNC. See Figure 1. 1) Published as ASD-STAN Prestandard at the
26、date of publication of this standard. http:/www.asd-stan.org/ 2) Published as ASD-STAN Technical Report at the date of publication of this standard. http:/www.asd-stan.org/ 3) Published by: DoD National (US) Mil. Department of Defense http:/www.defenselink.mil/ BS EN 2794-004:2014EN 2794-004:2014 (E
27、) 5 Key 1 Push button released 2 Black colour according to FED-STD-595B 3 White 4 Marking, see Clause 6 5 Push button pressed 6 Attachment nut 7 Lock washer 8 1 max. to 3 max 9 Marking, see Clause 6 10 Positioning lug in accordance with the panel cut-out, as per TR 6083C202 11 Rated current marking
28、(white on black) Figure 1 Configuration Dimensions Tolerances 4.2 Electrical diagram See Figure 2. Push button released: CB open. Push button pressed: CB closed. BS EN 2794-004:2014EN 2794-004:2014 (E) 6 Key 1 Supply 2 Load Load and supply can be inverted Figure 2 Electrical diagram 4.3 Mass 62 g ma
29、x. (delivery code A including hardware). 4.4 Panel cut-out See EN 2794-001. 5 Characteristics 5.1 Material, surface treatment See EN 2794-001. 5.2 Mechanical characteristics 5.2.1 Fasteners See EN 6113. 5.2.2 Recommended tightening torque of attaching nut for installation (5,25 0,25) N.m. BS EN 2794
30、-004:2014EN 2794-004:2014 (E) 7 5.2.3 Recommended tightening torque of connection hardware for installation (2,35 0,15) N.m. 5.2.4 Resistance to vibrations 5.2.4.1 Combined test: ambient temperature at 70 C and vibrations Sinusoidal : 10 gn, see EN 2794001. Random : 5,8 gn, see EN 2794001. Low frequ
31、encies : 10 gn, see EN 2794001. 5.2.4.2 Combined test: ambient temperature at 85 C, altitude and vibrations Sinusoidal: 3 gn, see EN 2794-001. 5.2.5 Resistance to shocks 50 gn, see EN 2794-001. 5.2.6 Mechanical endurance See Table 6. 5.3 Environment characteristics 5.3.1 Humidity See EN 2794-001. 5.
32、3.2 Corrosion See EN 2794-001. 5.3.3 Contaminating liquids See EN 2794-001. 5.3.4 Overvoltage caused by lightning See EN 2794-001. 5.4 Electrical characteristics 5.4.1 Nominal voltage of operational circuits See Table 1. Table 1 Nominal voltage 28 V d.c. 115 V a.c., frequency 360 Hz to 800 Hz BS EN
33、2794-004:2014EN 2794-004:2014 (E) 8 5.4.2 Voltage drop at nSee Table 2. Table 2 Ratings A 20 25 30 35 40 45 50 U max. at n V 0,15 0,15 0,15 0,15 0,12 0,12 0,12 5.4.3 Minimum and maximum tripping thresholds See Table 3. Table 3 Overload (in % of n) Ambient temperatures Ratings Minimum thresholds valu
34、e 1 h Maximum thresholds value 1 h C A On ground At 15 000 m On ground 23 5 All 110 105 145 55 5 110 105 165 70 5 105 100 145 125 5 90 80 145 5.4.4 Overload trip See Table 4. Table 4 Overload (in % of n) 200 500 1 000 Ambient temperatures C Ratings A Trip time s 23 5 4 to 20 55 5 All 70 0,15 to 2,50
35、 0,045 to 0,600 125 5 1,5 BS EN 2794-004:2014EN 2794-004:2014 (E) 9 5.4.5 Short-circuit values See Table 5. Table 5 Nominal voltage 28 V d.c. 115 V a.c., 360 Hz to 800 Hz Prospective currents 4.000 A L/R 1 ms 0,8 cos 1 2 000 A r.m.s. Test altitudes On the ground and at maximum altitude (15 000 m, 12
36、 100 Pa) Number of operations 1 CO a+ 2 OCO baBreak operation (for definition refer to EN 3841305). bMake operation (for definition refer to EN 3841305). 5.4.6 No-Load and load endurance See Table 6. Table 6 Number of operations to be provided No-load Load 5 000 2 500 2 500 2 500 2 500 All ratings M
37、ain contacts Applicable Not applicable Resistive n, 28 V d.c. Inductive L/R = 5 ms n, 28 V d.c. Inductive 0,6 cos 0,7n, 115 V a.c. 360 Hz to 800 Hz NOTE 1 One operation corresponds to one closing + one opening. NOTE 2 Tolerances 5 % on current, voltage and frequency values. 5.4.7 Dielectric rigidity
38、 See Table 7. Table 7 Closed position Z = 0 m Z = 15 000 m 1 and 2 with attachment 1 500 V 400 V Open position Z = 0 m Z = 15 000 m 1 with 2 1 500 V 400 V 1 and 2 with attachment 5.4.8 Insulation resistance According to EN 2794-001, Table 5. BS EN 2794-004:2014EN 2794-004:2014 (E) 10 6 Designation E
39、XAMPLE If necessary, the code I9005 shall be placed between the description block and the identity block. 7 Rated current code See Table 8. Table 8 Ratings n20 25 30 35 40 45 50 Marking on actuator 20 25 30 35 40 45 50 Rated current code (A) 20 25 30 35 40 45 50 8 Delivery hardware code See Table 9.
40、 Table 9 Delivery hardware code Connection and attachment hardware kits EN 6113 Delivery conditions Kit part-No. aIncluded parts Pieces per part Fitted Supplied separately A EN 6113A Connecting screw 2 X Connecting lock washer 2 Attachment nut 1 Attachment lock washer 1 B EN 6113B Attachment nut 1 X
41、 Attachment lock washer 1 aSpare parts could be ordered separately, informations see EN 6113. BS EN 2794-004:2014EN 2794-004:2014 (E) 11 9 Marking As defined on the drawing and unless otherwise specified by contract, marking shall include: the designation defined in Clause 6 on the packaging; the ma
42、nufacture date (year, week): YYWW; the manufacturers name or trademark; the electrical diagram and the terminal identification; the pin terminal identification; the manufacturers part number (corresponding to the part number with connection and attachment hardware). NOTE The marking could be combine
43、d on the both opposite faces. For electrical diagram and/or terminal identification refer to the Figure 1. 10 Technical specification See EN 2794-001. This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other stan
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