1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 2794-004 Edition P 2 June 2012 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: 49.060 Supersedes edi
2、tion P 1 of June 1994 and will supersede EN 2794-004:1999Descriptors: ENGLISH 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,
3、 intensits nominales 20 A 50 A 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 “Aerospace Series“ Prestandard has been drawn up under the responsibility of
4、 ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published 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 Prestan
5、dard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) t
6、o CEN (European Committee for Standardization) for formal vote and transformation to full European 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
7、 EN. Edition approved for publication 30 June 2012 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2012 by ASD-STAN prEN 2794-004:2012 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Dimensions and mass .3 4 Characte
8、ristics .5 5 Designation 9 6 Rated current code 9 7 Delivery hardware codes 10 8 Marking .10 9 Technical specification .10 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD
9、-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 2794-004:2012 (E) 3 1 Scope This 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-bo
10、ard circuits at a temperature between 55 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 refere
11、nces 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 amendments) applies. EN 2350, Aerospace series Circuit breakers T
12、echnical 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 Circuit
13、 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 Dimension
14、s 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 dat
15、e of publication of this standard (www.asd-stan.org). 2) Published as ASD-STAN Technical Report at the date of publication of this standard (www.asd-stan.org). 3) Published by: Department of Defense (DOD), the Pentagon, Washington, D.C. 20301 USA. prEN 2794-004:2012 (E) 4 Key 1 Push button released
16、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 (white on black) Figure 1 Co
17、nfiguration Dimensions Tolerances prEN 2794-004:2012 (E) 5 4.2 Electrical diagram See Figure 2. Push button released: CB open. Push button pressed: CB closed. Key 1 Supply 2 Load Load and supply can be inverted. Figure 2 Electrical diagram 4.3 Mass 62 g max. (delivery code A including hardware). 4.4
18、 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. prEN 2794-004:2012 (E) 6 5.2.3 Recommended tightening
19、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 2794-001. Random : 5,8 gn, see EN 2794-001. Low frequencies : 10 gn, see EN 2794-001. 5.2.4.2 Combined test: amb
20、ient 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. 5.3.2 Corrosion See EN 2794-001. 5.3.3 Contaminating liquids
21、 See EN 2794-001. 5.3.4 Overvoltage caused by lightning See EN 2794-001. prEN 2794-004:2012 (E) 7 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 5.4.2 Voltage drop at nSee Table 2. Tab
22、le 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 value 1 h Maximum thresholds value 1 h C A On ground At 15 000 m On ground 23 5
23、 All 110 105 145 55 5 110 105 165 70 5 105 100 145 125 5 90 80 145prEN 2794-004:2012 (E) 8 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 All 4 to 20 0,15 to 2,50 0,045 to 0,600 55 5 70 125 5 1,5 5.4.5 Short-circuit value
24、s 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, 12 100 Pa) Number of operations 1 CO a 2 OCO baBreak operation (for definition refer to EN 3841
25、-305). bMake operation (for definition refer to EN 3841-305). 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 Main contacts Applicable Not applicable Resistive n, 28 V d.c. Inductive L/R 5 ms n, 28 V d.c
26、. 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. prEN 2794-004:2012 (E) 9 5.4.7 Dielectric rigidity See Table 7. Table 7 Closed position Z 0 m Z 15 000 m 1 and 2 with atta
27、chment 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. 6 Designation EXAMPLE Description block CIRCUIT BREAKER Identity block EN2794-004D20AA Number of this standard Design code, D: black butto
28、n Rated current code (see Table 8) Delivery hardware code A (see Table 9) NOTE 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 cur
29、rent code (A) 20 25 30 35 40 45 50 prEN 2794-004:2012 (E) 10 8 Delivery hardware code See Table 9. 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
30、X Connecting lock washer 2 Attachment nut 1 Attachment lock washer 1 B EN 6113B Attachment nut 1 X Attachment lock washer 1 aSpare parts could be ordered separately, informations see EN 6113. 9 Marking As defined on the drawing and unless otherwise specified by contract, marking shall include: the d
31、esignation defined in Clause 6 on the packaging; the manufacture 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 combined on the both opposite faces. For electrical diagram and/or terminal identification refer to the Figure 1. 10 Technical specification See EN 2794-001.
