1、AECMA PREN21.195 9 10123LL 00071.186 T K- -. Approved by COMITE DE NORMALISATION of A.E.C.M.A. 20th January 1989 A. E. C. M .A. STAND AR D NOR ME A.E.C. M .A. A.E.C.M.A. NORM The equivalent versions in French and German languagescan be supplied by B.N.A.E, 8, rue Moreau-Vaufhier 92100 BOULOGNE-BILLA
2、NCOURT - FRANCE prEN 2495 Edition 1 January 1989 EDITE PAR LASSOCIATION EUROPPENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS - TEL. 45-63-82-85 UDC : 621.31 6.57 : 629.7 Key words : Aircraft industry, aircraft equipment, circuit breaker, manufacturing requireme
3、nts, designation, marking. ENGLISH VERSION Aerospace series Single-pole circuit breakers temperature compensated rated currents up to 25 A Product standard Srie arospatiale Luft- und Raumfahrt Disjoncteurs unipolaires Temperaturkompensierte compenss en temprature einpolige Schutzschalter Norme de pr
4、oduit Produktnorm dintensit nominale jusqu 25 A Nennstrme bis 25 A This .Aerospace series. standard has been drawn up under the responsibility ofAECMA Association Europenne des Constructeurs de Matriel Arospatial). It is published on yellow paper in three equivalent versions (English, French, German
5、). It will be submitted as a draft European Standard to CEN (European Committee for Standardization) for final vote. I t aecma 1989 AECMA PREN2495 89 10L2311 0007487 L = prEN 2495 Page 2 Contents 1 2 References 3 Definitions and symbols 4 Required characteristics 5 Designation 6 Marking 7 Technical
6、specification Scope and field of application - AECMA PREN2495 89 LOL23LL 0007488 3 W: Voltages of the aircraft electrical prEN 2495 Page 3 1 This standard specifies the required characteristics for single-pole temperature compensated circuit breakers of current ratings from 0,5 to 25 A. These circui
7、t breakers are operated by a single push-pull button with trip-free release, delayed tripping and are explosion proof. Their operation is ensured up to short circuit current. Their temperature range lies between - 55 and 125 OC, at an altitude Z = 22 O00 m max. This standard shall be used in conjunc
8、tion with EN 2350. Scope and field of application 28 V direct current (d.c.) 26 V alternative current, frequency 400 Hz, single-phase (a.c.) 2 References EN 2282, Aerospace series - Characteristics of aircraft electrical supplies 1) EN 2350, Aerospace series - Circuit breakers - Technical specificat
9、ion 3 Definitions and symbols See EN 2350. Y Required characteristics 4.1 Rated current (In) and voltages See tables 1- and 2. Table 1 Table 2 I I system 115 V alternative current, frequency 400 Hz, single-phase (a.c.) When used on an aircraft electrical system of variable frequency, in compliance w
10、ith EN 2282, the limit values (voltage and frequency) shall be specified. 1) In preparation AECIA PREN2495 89 = L0123LL 0007489 5 prEN 2495 Page 4 4.2 DinienSiOnS, mouilting, electrical connection See figures Mounting face -7- , 2 and 3 (dimensions ir mi) Button closed &10,6?0,2 r II I V I , 1 ,1 &8
11、,5*0,3 TI IT black white Button released M12x1 /- 7/ c Marking* (terminal 1 connected or 3 on one terminai with the other limited to 1 Screw, cheese head, cross recess1 (Phillips), M 4 (code MI L 10,5*0,3 (r l 15,8 max. w L Hexagon head bolt 8-32 UNC (code U) Figure 1 - Circuit breaker , Anti-rotati
12、on tab suitable for mounting holes as per figure 2 * The presence of marking is left to the manufacturers option -A- - I i c E .- %I I 1 -+-A- I 4 2min. with protection 25 min. for installation Figure 2 - Mounting holes, panel thickness between 1,5 and 3 - Rating indication (example) Lock washer Fig
13、ure 3 - Electrical connection AECMA PREN2495 89 W L0123LL 0007490 L W C ha rac te r i s t i c s prEN 2495 Page 5 Requirements 4.3 Kass max. 26 g 4.4 Mechanical characteristics See table 3. Operating force Opening force Table 3 5N30N load Pull direction I I I 110 N Closing force Tighten i ng torque I
14、 3,5 N 45 N 1,7 Nm Mechanical streng th Actuator button Mounting Transverse load I 110 N I Push direction Longitudinal I 110 N Tightening torque 5 Nm I- Run-down torque I 1,5 Nm I Elect r ica I connection Pull force 110 N along F1 See figure 3 Push force 55 N along F2 See figure 3 I I AECMA PREN2495
15、 89 1012311 0007491 3 prEN 2495 Page 6 4.5 Environmental characteristics See table 4 Table 4 Character istics Requirements 5 Hz to 20 Hz constant deflection, 2 a = 2,5 rnm 20 Hz to 33 Hz, constant acceleration 19,6 rn/s2 (w 2 g) Vibrations 33 Hz to 74 Hz, constant deflection 2 a = 0,9 rnrn I t 74 Hz
16、 to 2000 Hz, constant acceleration 98,l rn/s2 (10 g) Mechanical shock 490,5 rn/sZ (=SO g) 11 rns Centrifugai acceleration 166,8 m/s2 (= 17 9) Sand and dust See EN 2350 See EN 2350 I Corrosion I Humidity See EN 2350 Category B : 10 cycles Explosion proofness In 0,5 to 3 A : 1000 A prospective curreni
17、 Iri 3 A : 2000 A prospective current I Flu id contamina tion See EN 2350 i AECMA PREN2495 9 1OL23LL 0007492 5 Character is tics prEN 2495 Page 7 Requirements 4.6 Electrical characteristics See table 5 Insulation resistance * 1500 V on the ground t=23+5OC D electric -55 +-5 cc 125? 5 OC 400 V 2 22 O
18、00 m t=23+5OC - strength - Table 5 min. 100 Ma leakage current 1 h point 1 h 23 140 I 115 -55 115 160 125 1 O0 140 Table 8 .I Tempera tu re Overload in % 200 500 1000 i- 5 .c of In 23 C Trip out -55 C times 1,5 to 30 0,15 to 2,5 0,035 to 0,6 125 .C in s I Table 9 riominal voltage No-load voltage Fau
19、lt current establishment time 28 V direct current 115 V, alternative current frequency 400 Hz 120 4- 5 v 30+2V - I 3 ms - - 2,5 ms 1 0,5 to 25 A 0,5 to 3 A 1 5 to 25 A Circuit breaker rating Prospective 6000 A 1000 P, 2000 A current L/R 1 ms 0,8 c cos Cp - 1 0,8 - cos Cp - 1 qrcund 22 O00 m grouiid
20、22 O00 rn qround 1 1 1 1 1 Number CO 1 1 1 1 1 of tests OCO 2 2 2 2 2 Test altitude Number of samples per rating range For CO, OCO, see EN 2350 22 000 n 1 1 2 AECMA PREN2495 89 W LOL23LL 0007494 9 -1 1 Circuit characteristics up to In = 10 A Above In = 10 A prEli 2495 Paye 9 Number of cycles require
21、d 115 V al terna tive frequency 400 Hz close at 0,l A At In At In At In (Mi inductive open low current load load load L/R = 5 ms 0,6 cosCP 0,7 no load 28 V direct current current 4- resistive load resistive inductive (Ml - - ( ha 5000 2500 up to 5000 5000 5000 In5A - 5000 2500 2500 2500 Supply volta
22、ge Overload 28 V + 1,4 V I=5In directcurrent L/R = 5 ms 115 V + 5,75 V alternative current, frequency 400 Hz I=5In 0,6 - cos CP - 0,7 Test conditions z=o Z = 22 O00 m t=23+5C - 20 cycles CO 20 cycles CO t, = 23 + - 5 “C 15 cycles CO 15 cycles OCO 15 cycles CO 15 cycles OCO I For CO and OCO, see EN 2
23、350 5 Designation Each circuit breaker shall be designated as in the following example : Description block CIRCUIT BREAKER I dent i ty block M = Thread code for metric screw (see figure 1) Reference of EN Standard 05A = Rating code (see table 1j Note : if necessary, the design code S9005 shall be inserted between the description block and the identity block. 6 Marking See EN 2350 7 Technical specification See EN 2350.
