1、AMSC N/A FSC 5930 INCH-POUND MIL-DTL-3786/20K 15 April 2010 SUPERSEDING MIL-DTL-3786/20J 26 March 2003 DETAIL SPECIFICATION SHEET SWITCH, ROTARY, CLOSED CONSTRUCTION, EXPLOSION PROOF, FLUX SEAL, .500 INCH DIAMETER, .200 AMPERE, STYLE SR20 This specification is approved for use by all Departments and
2、 Agencies of the Department of Defense. The requirements for acquiring the switches described herein shall consist of this specification sheet and MIL-DTL-3786. FIGURE 1. Dimensions and configurations. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
3、MIL-DTL-3786/20K 2 FIGURE 1. Dimensions and configurations - Continued.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 3 Inches mm Inches mm Inches mm .001 0.03 .020 0.51 .210 5.33 .002 0.05 .031 0.79 .219 5.56 .003 0.08 .032 0.81 .2
4、50 6.35 .004 0.10 .050 1.27 .260 6.60 .005 0.13 .065 1.65 .500 12.70 .007 0.18 .093 2.36 .576 14.63 .015 0.38 .125 3.18 .625 15.88 .203 5.16 .713 18.11 NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Unless otherwise specified, tolerances are .005
5、 (0.13 mm) and 3 degrees on angles (noncummulative). 4. Shaft flat angle A is the angle between a line through the center of the shaft perpendicular to the mounting bushing flats and another line through the center of the shaft perpendicular to the mounting bushing flats and another line through the
6、 center of the shaft and perpendicular to the shaft flat with switch in position one. For slotted switches, the slot is in line with the point of contact for pole number one. 5. Position number one and terminal number one coincide. FIGURE 1. Dimensions and configurations - Continued. Provided by IHS
7、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 4 REQUIREMENTS: Dimensions and configuration: See figure 1. Angle A of 15 for switches of 30 angle of throw, 18 for switches of 36 angle of throw, 22.5 for switches of 45 angle of throw, 30 for switch
8、es of 60 angle of throw, and 45 for switches of 90 angle of throw. Angle of throw: 30, 36, 45, 60, 90. Construction styles: Symbols E, F, J, and K. Insulation: Symbol P (plastic). Mounting hardware: Each switch shall be provided with one corrosion-resistant steel hexagon nut, .089 .010 inch (2.26 mm
9、 0.254 mm) thick by .375 inch (9.53 mm) across the flats and one internal-toothed lockwasher, .402 .006 (10.21 mm .152 mm) outside diameter. Temperature-life characteristic: B (25,000 cycles) (-65C and +85C). Vibration grade: 3 (10 Hz to 2,000 Hz). Shock symbol: B (medium and high impact). Altitude:
10、 C (70,000 feet). Terminal strength (pull): A force of 1.5 pounds shall be applied to the terminals. Terminal marking: Switches may be marked with terminal numbers on side of switch. Stop strength: Stops shall withstand a force of 7.5 inch-pounds. Flux seal: Applicable when specified in the Part or
11、Identifying Number (PIN). Low level circuit life: Applicable when specified in PIN. Positive shaft grounding: Applicable when specified in PIN. Rotational torque: The minimum and maximum value of torque determined for shaft rotation shall be within limits specified in table I. TABLE I. Rotational-to
12、rque limits. Torque (in-lb) Temperature Minimum Maximum Room 0.5 1.5 Minimum 0.5 2.0 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 r
13、otor contact of the switch. Low level circuit life is applicable as specified by PIN. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 5 TABLE II. Electrical loads. Environmental condition Lamp load (tungsten) Inductive load Resistive
14、 load mA V dc mA V dc mA Volts At atmospheric pressure 1/ 100 28 30 28 200 28 dc 75 115 V rms 60 Hz At reduced barometric pressure - - - - 200 28 dc 75 115 V rms 60 Hz 1/ The contact resistance (applicable to ac and dc), after life test, shall not exceed 50 milliohms. Dielectric withstanding voltage
15、: The magnitude of test voltage for the dielectric withstanding voltage shall be 600 V ac at temperature pressure and 250 V ac at reduced pressure. Test procedure on lamp load at atmospheric: The test procedure on lamp at atmospheric pressure shall be as follows: Test potential and load: One pole on
16、 four switches, each for atmospheric and at reduced barometric pressure, shall be energized by the specified lamp load. A common terminal and one selected terminal shall be arranged to be “on” once per cycle. The next selected terminal shall be unloaded. Suitable means shall be provided to indicate
17、when contacts have failed to make and break. Ordering data: Acquisition documents should specify the following: a. Title, number, and date of this specification sheet, and the military PIN as listed in table III, example A, or table IV, table V, and table VI, example B. b. For switches not listed in
18、 table III, table IV, table V, and table VI, acquisition shall be in accordance with the ordering data of MIL-DTL-3786 (for switches covered by specification sheets but not by military PINs). c. Switches covered are style SR20 units. Provided by IHSNot for ResaleNo reproduction or networking permitt
19、ed without license from IHS-,-,-MIL-DTL-3786/20K 6 PIN: The PIN shall be assigned using example A, which consists of a dash number from table III, and appropriate suffix letter as required. If the desired characteristics are not defined, the PIN shall be assigned by using the code letters from table
20、 IV, table V, and table VI as described in example B illustrated below: Example A: Nonflux-sealed, slotted terminal switches M3786/20-351 T G L Switching characteristics (see table III) Add the letter T when a slotted shaft is required Add the letter G if positive shaft grounding is required Add the
21、 letter L for low level requirement NOTE: M3786/351TGL identifies a nonflux-sealed rotary switch of construction E, temperature-life characteristic B, a 45 angle of throw, two poles per deck, three positions, nonshorting switching characteristics, slotted shaft, with low level and ground shaft. Exam
22、ple B: Flux-sealed switches: M3786/20-G E CL Switching characteristics, type of shaft and length of housing (see table IV) Type construction, low level capability shaft grounding, and type of termination (see table V) Angle of throw, poles per deck and number of positions per pole (see table VI) NOT
23、E: M3786/20-GECL identifies a flux-sealed rotary switch that is explosion proof, flux proof, closed construction, sealed shaft and panel seal, with a flatted shaft, .542 .020 inches (13.21 .51 mm), nonshorting switching characteristics, a 45 angle of throw, 2 poles, 4 positions per pole, constructio
24、n type K, a grounded shaft with low level capabilities and printed circuit termination. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 7 TABLE III. PIN M3786/20- Switching characteristics and PINs: Nonflux-sealed, slotted terminal s
25、witches. Construction: F Temperature-life characteristic: B PIN M3786/20- Construction: E Temperature-life characteristic: B Angle of throw Number of poles Position per pole Switching characteristic (S or NS) 001 301 36 1 2 S 002 302 36 1 3 S 003 303 36 1 4 S 004 304 36 1 5 S 005 305 36 1 6 S 006 30
26、6 36 1 7 S 007 307 36 1 8 S 008 308 36 1 9 S 009 309 36 1 1/ 10 S 010 310 36 2 2 S 011 311 36 2 3 S 012 312 36 2 4 S 013 313 36 2 5 S 014 314 36 1 2 NS 015 315 36 1 3 NS 016 316 36 1 4 NS 017 317 36 1 5 NS 018 318 36 1 6 NS 019 319 36 1 7 NS 020 320 36 1 8 NS 021 321 36 1 9 NS 022 322 36 1 1/ 10 NS
27、023 323 36 2 2 NS 024 324 36 2 3 NS 025 325 36 2 4 NS 026 326 36 2 5 NS 027 327 60 1 2 S 028 328 60 1 3 S 029 329 60 1 4 S 030 330 60 1 5 S 031 331 60 1 1/ 6 S 032 332 60 2 2 S 033 333 60 2 3 S 034 334 60 3 2 S 035 335 60 1 2 NS 036 336 60 1 3 NS 037 337 60 1 4 NS 038 338 60 1 5 NS 039 339 60 1 1/ 6
28、 NS 040 340 60 2 2 NS See footnote at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 8 TABLE III. Switching characteristics and PINs: Nonflux-sealed, slotted terminal switches. PIN M3786/20- Construction: F Temperature
29、-life characteristic: B PIN M3786/20- Construction: E Temperature-life characteristic: B Angle of throw Number of poles Position per pole Switching characteristic (S or NS) 041 341 60 2 3 NS 042 342 60 3 2 NS 043 343 45 1 2 NS 044 344 45 1 3 NS 045 345 45 1 4 NS 046 346 45 1 5 NS 047 347 45 1 6 NS 0
30、48 348 45 1 7 NS 049 349 45 1 1/ 8 NS 050 350 45 2 2 NS 051 351 45 2 3 NS 052 352 45 2 4 NS 053 353 36 1 10 S 054 354 36 1 10 NS 055 355 60 1 6 S 056 356 60 1 6 NS 057 357 45 1 8 NS 058 358 36 3 2 S 059 359 36 3 3 S 060 360 36 4 2 S 061 361 36 3 2 NS 062 362 36 3 3 NS 063 363 36 4 2 NS 064 364 30 1
31、2 S 065 365 30 1 3 S 066 366 30 1 4 S 067 367 30 1 5 S 068 368 30 1 6 S 069 369 30 1 7 S 070 370 30 1 8 S 071 371 30 1 9 S 072 372 30 1 10 S 073 373 30 1 11 S 074 374 30 1 1/ 12 S 075 375 30 1 12 S 076 376 30 2 2 S 077 377 30 2 3 S 078 378 30 2 4 S 079 379 30 2 5 S 080 380 30 2 6 S 081 381 30 3 2 S
32、082 382 30 3 3 S 083 383 30 4 2 S 084 384 30 4 3 NS See footnote at end of table. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 9 TABLE III. Switching characteristics and PINs: Nonflux-sealed, slotted terminal switches. PIN M3786/2
33、0- Construction: F Temperature-life characteristic: B PIN M3786/20- Construction: E Temperature-life characteristic: B Angle of throw Number of poles Position per pole Switching characteristic (S or NS) 085 385 30 1 2 NS 086 386 30 1 3 NS 087 387 30 1 4 NS 088 388 30 1 5 NS 089 389 30 1 6 NS 090 390
34、 30 1 7 NS 091 391 30 1 8 NS 092 392 30 1 9 NS 093 393 30 1 10 NS 094 394 30 1 11 NS 095 395 30 1 1/ 12 NS 096 396 30 1 12 NS 097 397 30 2 2 NS 098 398 30 2 3 NS 099 399 30 2 4 NS 100 400 30 2 5 NS 101 401 30 2 6 NS 102 402 30 3 2 NS 103 403 30 3 3 NS 104 404 30 4 2 NS 105 405 30 4 3 NS 1/ Continuou
35、s rotation. TABLE IV. Switching characteristics and type of shaft. Code letter Switching characteristics Shaft type Dimension “A” (figure 1) A Nonshorting Flatted .576 .015 B Nonshorting Slotted .576 .015 C Shorting Flatted .576 .015 D Shorting Slotted .576 .015 E Nonshorting Flatted .542 .020 F Non
36、shorting Slotted .542 .020 G Shorting Flatted .542 .020 H Shorting Slotted .542 .020 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 10 TABLE V. Code letter for type construction, low level capability, shaft grounding, and type of te
37、rmination. 1/ Code letter Type construction Low level capability Shaft grounding PC terminals Solder lug terminals A J Yes Yes Yes No B J Yes No Yes No C J No Yes Yes No D J No No Yes No E K Yes Yes Yes No F K Yes No Yes No G K No Yes Yes No H K No No Yes No J J Yes Yes No Yes K J Yes No No Yes L J
38、No Yes No Yes M J No No No Yes N K Yes Yes No Yes P K Yes No No Yes S K No Yes No Yes T K No No No Yes 1/ Applicable to J and K constructions only. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 11 TABLE VI. Code letter for combinat
39、ion of angle of throw poles per deck, and number of positions per pole. Code letter Angle of throw Poles per deck 1/ Number of positions Code letter Angle of throw Poles per deck 1/ Number of positions Code letter Angle of throw Poles per deck 1/ Number of positions AA 30 1 2 BD 36 1 7 CG 60 1 4 AB
40、30 1 3 BE 36 1 8 CH 60 1 5 AC 30 1 4 BF 36 1 9 CJ 60 1 6 AD 30 1 5 BG 36 1 10 CK 60 1 2/ 6 AE 30 1 6 BH 36 1 2/ 10 CL 60 2 2 AF 30 1 7 BJ 36 2 2 CM 60 2 3 AG 30 1 8 BK 36 2 3 CN 90 1 2 AH 30 1 9 BL 36 2 4 CP 90 1 3 AJ 30 1 10 BM 36 2 5 CR 90 1 4 AK 30 1 11 BN 45 1 2 CT 90 1 2/ 4 AL 30 1 12 BP 45 1 3
41、 CV 90 2 2 AM 30 1 2/ 12 BR 45 1 4 AN 30 2 2 BT 45 1 5 AP 30 2 3 BV 45 1 6 AR 30 2 4 BW 45 1 7 AT 30 2 5 BY 45 1 8 AV 30 2 6 CA 45 1 2/ 8 AW 36 1 2 CB 45 2 2 AY 36 1 3 CC 45 2 3 BA 36 1 4 CD 45 2 4 BB 36 1 5 CE 60 1 2 BC 36 1 6 CF 60 1 3 1/ Switches with PC terminations are available in one and two
42、pole configurations only. 2/ Continuous rotation. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3786/20K 12 Referenced documents: MIL-DTL-3786 The margins of this specification are marked with vertical lines to indicate where modifications
43、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 n
44、otations. Custodians: Preparing activity: Army - CR DLA - CC Navy - EC Air Force - 85 (Project 5930-2010-023) DLA - CC Review activities: Army AR, AT, AV, CR4, MI, SM Navy - AS, CG, MC, OS Air Force - 19, 99 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-,-,-
