1、AMSC N/A FSC 5930 INCH-POUND MIL-PRF-8805/39H 6 December 2012 SUPERSEDING MIL-PRF-8805/39G 4 October 2004 PERFORMANCE SPECIFICATION SHEET SWITCHES, SENSITIVE, LIMIT, PLUNGER, 7 AMPERES, RESILIENT SEAL, FLUID RESISTANT This specification is approved for use by all Departments and Agencies of the Depa
2、rtment of Defense. The complete requirements for acquiring the switches described herein shall consist of this specification and the latest issue of MIL-PRF-8805. NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Unless otherwise stated, tolerance i
3、s .010 (0.25 mm). 4. Contour optional, provided maximum dimensions specified are not exceeded. 5. Leads shall be marked with the switch circuit identification number followed by wire gauge number (1-20, 2-20, etc.). 6. Alternative base metals and protective finishes, as approved by the qualifying ac
4、tivity, may be utilized for hexagon nut, lock washer and keyway washer material. Dimensions shall be in accordance with the referenced hardware specifications. FIGURE 1. Dimensions and configurations. Inches mm Inches mm .003 0.08 .250 6.35 .004 0.10 .584 14.83 .030 0.76 .625 15.88 .038 0.97 1.000 2
5、5.40 .072 1.83 1.375 34.93 .125 3.18 2.0 50. 72.0 1828. NASM 35333-138 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-8805/39H 2 REQUIREMENTS: Dimensions and configurations: See figure 1 and table I. Enclosure design: 4 (resilient). All entr
6、ances to the switch cavity except through the actuator bushing shall be sealed by fusion of glass-to-metal, metal-to-metal, or ceramic-to-metal and the lead wires shall be potted to provide stress relief. Temperature characteristic: 1 (-55C to +85C). Shock type: M (100 gs). Sinusoidal vibration grad
7、e: 2 (10 to 2,000 Hz). Finish: Switch housing shall be processed to resist corrosion. Maximum weight: MS21321-1: .45 pound. MS21321-2: .80 pound. NOTE: MS21321 was superseded by MIL-PRF-8805/39, the MS21321 Part Numbers (PINS) were retained. Operating characteristics: 20 percent variation from speci
8、fied values acceptable after test. Actuating force: 9 3 pounds. Overtravel force: 30 pounds maximum. Release force: 4 pounds minimum. Pretravel: .040 inch (1.01 mm) maximum. Movement differential: .020 inch (0.50 mm) maximum. Overtravel: .250 inch (6.35 mm) minimum. Coincidence of operating and rele
9、asing points: All poles shall transfer within .010 inch (0.25 mm) of plunger travel. Strength of actuating means: 35 pounds. Contact resistance: Not applicable. Insulation resistance: 100 megohms. Terminal strength: 15 pounds. Dielectric withstanding voltage: At atmospheric pressure: 1,000 V rms. At
10、 reduced barometric pressure: 50,000 feet; 400 V rms. Mechanical endurance: 25,000 cycles. Electrical endurance: 25,000 cycles. Electrical ratings: See table II. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-8805/39H 3 Fluid resistance: Exc
11、ept for the cut end of the lead wire, switches shall be submerged in each of the following fluids for 2 minutes to 2 minutes 30 seconds, which shall consist of one cycle (one cycle is 10 minutes to 12 minutes 30 seconds total). Each switch shall be subjected to three cycles. a. Turbine fuel (MIL-DTL
12、-5624). b. Hydraulic fluid (SAE AS1241). c. Coolanol (MIL-PRF-87252). d. Ethylene glycol (ASTM-E-1119). e. Lubricating oil (MIL-PRF-7808). After each immersion, the excess fluid shall be blown off the external surfaces of the switch with an air jet. Following the third cycle, the switch shall be sub
13、jected to and shall meet the requirements for dielectric withstanding voltage, insulation resistance, operating characteristics, seal tests, and marking visibility. Marking: The circuit schematic shall be marked on the switch case. PIN: See table I. Qualification inspection: Group submission: See ta
14、ble III. Group A inspection: Seal test: Only watertight test shall be performed. TABLE I. Part or Identifying Number (PIN) and characteristics. PIN A diameter maximum B maximum Lead wires, number required MS21321-1 .720 (18.29) .980 (24.89) 6 MS21321-2 1.031 (26.19) 1.200 (30.48) 12 NOTE: MS21321 wa
15、s superseded by MIL-PRF-8805/39, the MS21321 PINs were retained. TABLE II. Electrical ratings. Load Sea level 28 V dc 50,000 feet 28 V dc (Amperes) (Amperes) Resistive 7 7 Inductive 4 2.5 Motor 4 4 1/ 1/ Application information only. Provided by IHSNot for ResaleNo reproduction or networking permitt
16、ed without license from IHS-,-,-MIL-PRF-8805/39H 4 TABLE III. Qualification inspection (group submission). Examination or test Samples Extent of Approval Qualification inspection table of MIL-PRF-8805 MS21321-2 (24 units) All Visual and mechanical examination MS21321-1 (2 units) Operating characteri
17、stics Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where modifications 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 an
18、d contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations. Referenced Documents: MIL-DTL-5624 MIL-PRF-7808 MIL-PRF-8805 MIL-PRF-87252 MS21340 MS25081 ASTM-E1119 NASM 35333 SAE-AS1241 Custodians: Preparing activity: Ar
19、my - CR DLA - CC Navy - EC Air Force - 85 (Project 5930-2011-118) DLA - CC Review activities: Army - AR, AV, MI Navy - AS, MC, OS, SH 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.dla.mil/ . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
