MIL-PRF-8805/39J
Fluid resistance: Except 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-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 subjected 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 table III.
Group A inspection:
Seal test: Only watertight test shall be performed.
TABLE I. Part or Identifying Number (PIN) and characteristics.
A diameter
Lead wires,
PIN
B maximum
maximum
number required
MS21321-1
.720 (18.29)
.980 (24.89)
6
MS21321-2
1.031 (26.19)
1.200 (30.48)
12
NOTE: MS21321 was superseded by MIL-PRF-8805/39, the MS21321 PINs
were retained.
TABLE II. Electrical ratings.
Sea level
50,000 feet
Load
28 V dc
28 V dc
(Amperes)
(Amperes)
Resistive
7
7
Inductive
4
2.5
Motor
4
4 1/
1/ Application information only.
3
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