1、AMSC N/A FSC 5930 INCH-POUND MIL-PRF-8805/38H 6 December 2012 SUPERSEDING MIL-PRF-8805/38G 4 October 2004 PERFORMANCE SPECIFICATION SHEET SWITCHES, PUSH, MOMENTARY, 4 CIRCUIT, 4 AMPERES OR LOW LEVEL, DUSTTIGHT This specification is approved for use by all Departments and Agencies of the Department o
2、f Defense. The complete requirements for acquiring the switches described herein shall consist of this specification and the latest issue of MIL-PRF-8805. Inches mm Inches mm Inches mm Inches mm Inches mm .010 0.25 .055 1.40 .25 6.4 .50 12.7 .75 19.1 .020 0.51 .06 1.5 .31 7.8 .640 16.26 .87 22.1 .02
3、2 0.56 .109 2.77 .37 9.4 .65 16.5 .875 22.23 .03 0.8 .15 3.8 .375 9.53 .68 17.2 1.68 42.7 NOTES: 1. Dimensions are in inches. 2. Unless otherwise stated, tolerances are .02 (0.51 mm) for two place decimals and .005 (0.13 mm) for three place decimals. 3. The circuit and terminal arrangement shall be
4、permanently and legibly marked on the switch case. 4. Metric equivalents are given for general information only. 5. Mounting hardware has .625-24 UNEF02A external thread and is removable for installation. 6. Alternative base metals and protective finishes, as approved by the qualifying activity, may
5、 be utilized for hardware material FIGURE 1. Dimensions and configurations. TYPE C MOUNTING LOCKWASHER NASM35333-138 or equivalent TYPE F MOUNTINGTYPE G MOUNTING Hex Nut MS25082-B11 or equivalent Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PR
6、F-8805/38H 2 REQUIREMENTS: Dimensions and configurations: See figure 1. Enclosure design: 2 (dusttight). Temperature characteristic: 1 (-55C to +85C). Shock type: (50 gs sine wave) method 213, test condition A, MIL-STD-202. Sinusoidal vibration grade: 1 (10 to 500 Hz). Weight: 0.40 pound maximum. Op
7、erating characteristics: Total plunger travel: .085 .015 inch. Operating force: 4 1 pounds. Strength of actuator means: 25 pounds. Terminal strength: 5 pounds. Finish: Shall be corrosion resistant, black and lusterless. Dielectric withstanding voltage: Sea level: 1,000 V rms; 1,000 V rms between all
8、 terminals and mounting plate and 200 V rms between all terminals following electrical endurance. Mechanical endurance: 50,000 cycles. Electrical endurance: 25,000 cycles. Electrical ratings: See table I. Sand and dust: Applicable. Low level circuit: Applicable when specified (see table III). Electr
9、onic logic circuit (5.o V dc, .010 ampere): Applicable when specified (see table III); 25,000 cycles at an actuation rate of 120 cycles per minute maximum with no “stick“, or “misses“, allowed when tested in accordance with ANSI/ECA RS448, method 17 as follows: Test condition: Each switch contact sh
10、all be tested using a 5.0 0.5 V dc, 10 1 mA resistive load. During each closure of the contacts, the voltage drop across the switch terminals shall be monitored for a duration of no less than 50 percent of each contact static closure. The switch contacts need not be monitored until 10 milliseconds a
11、fter the initial contact closure to exclude any contact bounce. During each opening of the contacts, the voltage drop across the switch terminals shall be monitored for a duration of no less than 50 percent of each contact opening. A voltage of 2.1 volts or greater across the switch terminals shall
12、constitute a contact “miss“ (failure to properly close the circuit). A voltage drop of less than 90 percent of the open-circuit voltage shall constitute a contact “stick“ (failure to properly open the circuit). The monitoring device shall either record the number of contact closures at which “sticks
13、“ and/or “misses“ occur, or discontinue the test when “sticks“ and/or “misses“ occur. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-8805/38H 3 Operating temperature: a. 25 percent for the test cycle at -55C specified. b. 25 percent for the
14、test cycle at room ambient conditions. c. 50 percent for the test cycle at +85C. Qualification: Group submission: See table II. Part number: See table III. TABLE I. Electrical ratings, power circuit switches (MS27903-1 through MS27903-6). Load Sea level 28 V dc 115 V ac, 400 Hz (Amperes) (Amperes) R
15、esistive 4 4 Inductive 2 2 Motor 2 2 NOTE: MS27903 was superseded by MIL-PRF-8805/38; the MS27903 Part Numbers (PINS) were retained. TABLE II. Qualification inspection. Examination or test Basic switch Other switch samples Extent of Approval Qualification inspection table of MIL-PRF-8805 MS27903-1 o
16、r MS27903-2 (all sample units) MS27903-3, MS27903-4, MS27903-5, MS27903-6 (2 sample units each) Visual and mechanical examination MS27903-1 through MS27903-06 Group I and group X of the qualification inspection table of MIL-PRF-8805 plus 2 additional samples shall be subjected to logic level circuit
17、 and operating characteristics MS27903-7 or MS27903-8 All Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-8805/38H 4 TABLE III. Part numbers and characteristics. Part number Type Button Electrical ratings MS27903-1 C Black Power circuit ratin
18、g (see table I) MS27903-2 C Red MS27903-3 G Black MS27903-4 G Red MS27903-5 F Black MS27903-6 F Red MS27903-7 C Black Low level and logic level rating MS27903-8 C Red MS27903-9 G Black MS27903-10 G Red MS27903-11 F Black MS27903-12 F Red NOTE: MS27903 was superseded by MIL-PRF-8805/38; the MS27903 P
19、art Numbers (PINS) were retained. Referenced Documents: MIL-PRF-8805 MS25082 MIL-STD-202 ECA-RS448 NASM 35333 Custodians: Preparing activity: Navy - EC DLA - CC Air Force - 85 DLA - CC (Project 5930-2011-117) Review activities: Air Force 99 NOTE: The activities listed above were interested in this d
20、ocument 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-,-,-
