MIL-PRF-8805/39J
REQUIREMENTS:
Dimensions and configurations: See figure 1 and table I.
Enclosure design: 4 (resilient). All entrances to the switch cavity except through the actuator bushing
shall be sealed by fusion of glass-to-metal, metal-to-metal, ceramic-to-metal, or other materials that
enable the switch to meet the performance requirements of this specification. The lead wires shall be
potted to provide stress relief.
Temperature characteristic: 1 (-55°C to +85°C).
Shock type: M (100 g's).
Sinusoidal vibration grade: 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NOTE: MS21321 was superseded by MIL-PRF-8805/39, the MS21321 Part Numbers (PINS)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 specified 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 releasing 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 reduced barometric pressure: 50,000 feet; 400 V rms.
Mechanical endurance: 25,000 cycles.
Electrical endurance: 25,000 cycles.
Electrical ratings: See table II.
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