1、AMSC N/A FSC 5930 INCH-POUND MIL-DTL-3786/39E 1 March 2010 SUPERSEDING MIL-DTL-3786/39D 18 October 2001 DETAIL SPECIFICATION SHEET SWITCH, ROTARY, CLOSED CONSTRUCTION, EXPLOSION PROOF, 400 MILLIAMPERES, STYLE SR39 This specification is approved for use by all Departments and Agencies of the Departme
2、nt of Defense. The requirements for acquiring the switches described herein shall consist of this specification sheet and MIL-DTL-3786. SWITCH WITH SOLDER LUG TERMINATIONS AND .250 MOUNTING BUSHING 30 ANGLE OF THROW SHOWN, SIMILAR 36 ANGLE OF THROW NOT SHOWN FIGURE 1. Dimensions and configurations.
3、Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 2 SWITCH WITH SOLDER LUG TERMINATIONS AND .375 MOUNTING BUSHING 30 ANGLE OF THROW SHOWN, SIMILAR 36 ANGLE OF THROW NOT SHOWN FIGURE 1. Dimensions and configurations - Continued. Provide
4、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 3 SWITCH WITH PRINTED CIRCUIT TERMINATIONS AND .375 MOUNTING BUSHING 30 ANGLE OF THROW SHOWN, SIMILAR 36 ANGLE OF THROW NOT SHOWN FIGURE 1. Dimensions and configurations - Continued. Provided
5、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 4 SWITCH WITH PRINTED CIRCUIT TERMINATIONS AND .250 MOUNTING BUSHING 30 ANGLE OF THROW SHOWN, SIMILAR 36 ANGLE OF THROW NOT SHOWN FIGURE 1. Dimensions and configurations - Continued. Provided by
6、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 5 Termination type Angle of throw Angle “A“ 3 Solder lug 30 15 Solder lug 36 36 PC 30 285 PC 36 288 Inches mm Inches mm Inches mm .001 0.03 .062 1.57 .368 9.35 .002 0.05 .066 1.68 .375 9.53 .003 0
7、.08 .075 1.91 .412 10.46 .004 0.10 .094 2.39 .500 12.70 .005 0.13 .110 2.79 .562 14.27 .010 0.25 .125 3.18 .687 17.45 .015 0.38 .156 3.96 .725 18.42 .020 0.51 .203 5.16 .729 18.52 .022 0.56 .219 5.56 .750 19.05 .031 0.79 .220 5.59 .875 22.23 .0361 0.917 .250 6.35 .037 0.94 .312 7.92 NOTES: 1. Dimens
8、ions are in inches. 2. Unless otherwise specified, tolerance is .015. 3. Metric equivalents are given for general information only. 4. Shaft flat angle “A“ is the angle between a line through the center of the shaft and center of the bushing keyway or bushing flats and another line through the cente
9、r of the shaft and perpendicular to the shaft flat, with switch in position 1 (full counterclockwise position). 5. Bushing keyway is .066 .022 wide by .0361 .003 deep measured from a .375 diameter. 6. In order to provide room for connecting conductors between decks or printed circuit terminals switc
10、hes, a spacer may be specified between decks 2 and 3, as determined by the Part or Identifying Number (PIN). FIGURE 1. Dimensions and configurations - Continued. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 6 NOTES: 1. Dimensions
11、are in inches. 2. Unless otherwise specified, tolerance is .015. 3. Metric equivalents are given for general information only. FIGURE 2. Front view of printed circuit terminal switch circuit diagram. Inches mm .015 0.38 .037 0.94 .075 1.91 .110 2.79 .300 7.62 Number of poles per deck Common terminal
12、 hole location 1 C12 C1and C2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 7 NOTES: 1. Switch is viewed from rear with bushing keyway at the none oclock position. 2. “C“ represents the common terminal. FIGURE 3. Rear view of solder
13、 lug terminal configuration. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 8 MOUNTING BUSHING WASHER (APPLICABLE TO PRINTED CIRCUIT TYPE WHEN SWITCH IS NOT BUSHING MOUNTED) Inches mm Inches mm Inches mm Inches mm Inches mm .002 0.0
14、5 .010 0.25 .032 0.81 .1545 3.924 .375 9.53 .003 0.08 .015 0.38 .060 1.52 .207 5.26 .400 10.16 .004 0.10 .025 0.64 .125 3.18 .250 6.35 .500 12.70 .005 0.13 .030 0.76 .130 3.30 .368 9.35 .625 15.88 .684 17.37 NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information
15、only. FIGURE 4. Mounting hardware.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 9 REQUIREMENTS: Dimensions and configuration: See figures 1 through 4. Construction type: E, F, J, or K, see PIN. Angle of throw and maximum number of
16、poles per deck: Switches with solder lug termination: 30: 6 poles. 36: 2 poles. Switches with printed circuit termination: 30: 2 poles. 36: 2 poles. Insulation material: Symbol P (plastic). Temperature life characteristic: B or C, see PIN. Vibration grade: Symbol 3 (10 to 2,000 Hz). Shock type: Symb
17、ol B (both high impact and medium impact . Altitude: Symbol C (70,000 feet.) Weight: 20 grams maximum for one deck switch; 3 grams maximum additional for each additional deck or spacer. Mounting hardware: Alternative base metals and protective finishes, as approved by the qualifying activity, may be
18、 utilized for mounting nut, lock washer, and nonturn washer material. Dimensions shall be in accordance with the referenced hardware specifications. Switches with solder lug termination and .250 inch (6.35 mm) diameter threaded bushing: Each switch shall be supplied with one hexagon nut, .062 .010 i
19、nch (1.57 0.25 mm) thick and .312 inch (7.92 mm) nominal across flats, or in accordance with MS25082-C13; one internal-tooth lock washer, .415 inch (10.54 mm) maximum outside diameter; and one nonturn washer (see figure 4.) Switches with solder lug termination and .375 inch (9.53 mm) diameter thread
20、ed bushing: Each switch shall be supplied with one hexagon in accordance with MS25082-C20; one internal-tooth lock washer in accordance with AA55609-76 or -134, and one nonturn washer (see figure 4.) Printed circuit termination: Each switch shall be supplied with mounting bushing washer (see figure
21、4) in addition to the hardware supplied on solder lug termination switches. Moisture resistance: Insulation resistance, measured immediately after conclusion of the moisture test and while the switches are still in the humidity chamber, shall be greater than .5 megohm. At the end of the drying perio
22、d, the insulation resistance shall be not less than 10 megohms. Mounting bushing strength: Strength of mounting bushing test shall be 10 inch-pounds. Stop strength: Stops shall be set in a clockwise direction from position number 1, when viewed from shaft end. Stops, when supplied, shall withstand a
23、 10 inch-pound torque. Terminal strength (pull): A force of 2 pounds minimum shall be applied to solder lug terminals. A force of 1 pound minimum shall be applied to printed circuit terminals. Contact resistance: Initial contact resistance shall not exceed 10 milliohms for switches with solder lug t
24、erminations and 20 milliohms for switches with printed circuit terminations. After life (rotational), contact resistance shall not exceed 50 milliohms for switches with solder lug terminations and 60 milliohms for switches with printed circuit terminations. Provided by IHSNot for ResaleNo reproducti
25、on or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 10 Rotational torque: The minimum and maximum values of torque determined for shaft rotation shall be within the limits specified in table I. The rotational torque shall not change more than 50 percent from its initial value an
26、d shall not be less than the minimum value specified. Life (rotational): The test loads for the applicable circuit conditions shall be as specified in table II. Each of the loads specified for the applicable environmental condition shall be switched by at least one rotor contact of the switch. Flux
27、seal: applicable to type J and K construction switches, see PIN. Qualification: To qualify all switches identified by military part number, the basic sample shall consist of M3786/39-UMR switches. In addition, the following switches shall be added to the samples subjected to the inspection groups sp
28、ecified: Four M3786/39-SME switches to groups I and IV., two M3786/39-CMS switches to groups I and VII, and two each M3786/39-TZP to groups I and VIII. TABLE I. Rotational torque limitsTotal number of . Temperature Torque (inch-ounces) switch poles Minimum Maximum Less than 6 Room 5 20 Minimum 5 22
29、6 through 12 Room 10 25 Minimum 10 27 More than 12 Room 15 30 Minimum 15 32 TABLE II. Circuit values for life (rotational) testEnvironmental condition . Inductive load (250 henries) Resistive load Milliamperes V dc Milliamperes V dc At atmospheric pressure (sea level) 125 28 dc and elevated temp. (8
30、5C or 125C). 25,000 cycles 50 28 75 115 V rms, 60 Hz At reduced barometric pressure and 50 28 dc room temp. (approximately 25C). 25,000 cycles 10 28 20 115 V rms, 60 Hz At atmospheric pressure (sea level) 500 28 dc and room temp. (approximately 25C). 10,000 cycles 1/ 250 28 500 115 V rms, 60 Hz 1/ T
31、hree additional samples will be run for qualification. Switch to be tested shall be PIN M3786/39-UMR. Dielectric withstanding voltage: The applicable voltage specified in table III shall be applied. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
32、-DTL-3786/39E 11 TABLE III. Dielectric test voltagesAltitude . Test voltages V rms (60 Hz) At atmospheric pressure 500 At reduced barometric pressure 350 Application note: To conserve material, space, and weight, particularly for multi-deck switches, the following is suggested: a. Two-position switc
33、hes with 30 angle of throw should have 6 poles per deck. b. Three-position switches with 30 angle of throw should have 4 poles per deck. c. Four-position switches with 30 angle of throw should have 3 poles per deck. d. Five- and six-position switches with 30 angle of throw should have 2 poles per de
34、ck. e. Two-, three-, four-, and five-position switches with 36 angle of throw should have 2 poles per deck. PIN: The PIN shall consist of the prefix M3786/39- followed in order by three appropriate characters from tables IV, V, and VI as shown in the following example: Example: M3786/39- K G M Speci
35、fication sheet number Character from table IV Letter from table V Letter from table VI In the preceding example, M3786/39-KGM identifies a switch on construction type J (flux sealed), shorting switching, 30 angle of throw, temperature-life characteristic B, .375 inch (9.53 mm) diameter mounting bush
36、ing, 1 pole per deck, 8 positions per pole (with stops), 1 deck, and solder lug termination. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 12 TABLE IV. First code character for PIN. Code character Construction type Switching charac
37、teristic Angle of throw Temperature/life characteristic Mounting bushing dia. A E or J NS 30 C .375 B E or J S 30 C .375 C F or K NS 30 C .375 D F or K S 30 C .375 E E or J NS 36 C .375 F E or J S 36 C .375 G F or K NS 36 C .375 H F or K S 36 C .375 J E or J NS 30 B .375 K E or J S 30 B .375 L F or
38、K NS 30 B .375 M F or K S 30 B .375 N E or J NS 36 B .375 P E or J S 36 B .375 Q F or K NS 36 B .375 R F or K S 36 B .375 S E or J NS 30 C .250 T E or J S 30 C .250 U F or K NS 30 C .250 V F or K S 30 C .250 W E or J NS 36 C .250 X E or J S 36 C .250 Y F or K NS 36 C .250 Z F or K S 36 C .250 2 E or
39、 J NS 30 B .250 3 E or J S 30 B .250 4 F or K NS 30 B .250 5 F or K S 30 B .250 6 E or J NS 36 B .250 7 E or J S 36 B .250 8 F or K NS 36 B .250 9 F or K S 36 B .250 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 13 TABLE V. Second
40、code character for PIN. Code letter Poles per deck Number of positions Rotation A 1 2 With stops B 1 3 With stops C 1 4 With stops D 1 5 With stops E 1 6 With stops F 1 7 With stops G 1 8 With stops H 1 9 With stops J 1 10 With stops K 1/ 1 10 Continuous L 2/ 1 11 With stops M 2/ 1 12 With stops N 2
41、/ 1 12 Continuous P 2 2 With stops Q 2 3 With stops R 2 4 With stops S 2 5 With stops T 2/ 2 6 With stops U 2/ 3/ 3 2 With stops V 2/ 3/ 3 3 With stops W 2/ 3/ 3 4 With stops X 2/ 3/ 4/ 4 2 With stops Y 2/ 3/ 4/ 4 3 With stops Z 2/ 3/ 5/ 6 2 With stops 1/ Applicable only to switches with 36 angle of
42、 throw. 2/ Applicable only to switches with 30 angle of throw. 3/ Applicable only to switches with solder lug termination. 4/ 4 decks maximum. 5/ 3 decks maximum. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/39E 14 TABLE VI. Third cod
43、e character for PIN. Code letter Number of decks Termination type Flux seal (Construction type J or K) A 1 Solder lug No B 2 Solder lug No C 3 Solder lug No D 4 Solder lug No E 5 Solder lug No F 1 Printed circuit No G 2 Printed circuit No H 1/ 3 Printed circuit No J 1/ 4 Printed circuit No K 3 Print
44、ed circuit No L 4 Printed circuit No M 1 Solder lug Yes N 2 Solder lug Yes P 3 Solder lug Yes Q 4 Solder lug Yes R 5 Solder lug Yes S 1 Printed circuit Yes T 2 Printed circuit Yes U 1/ 3 Printed circuit Yes V 1/ 4 Printed circuit Yes W 3 Printed circuit Yes X 4 Printed circuit Yes 1/ The 3 and 4 dec
45、k switches identified with these code characters are provided with a spacer between decks 2 and 3. The spacer is the same thickness as 1 deck. Reference Document: MIL-DTL-3786 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where modification
46、s from this revision were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal
47、 notations. Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 85 (Project 5930-2010-015) DLA CC NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the ASSIST Online database at https:/assist.daps.dla.mil/ . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
