MIL-PRF-22885/77E
Weight: 1.880 ounces maximum for momentary and alternation action and indicator light.
2.0 ounces maximum for magnetic hold.
Lamps:
Display type W pushbutton shall accommodate four lamps (T-1 ¾ midget flange base) except lens
configuration 0 (see figure 3) shall accommodate only two lamps.
Display type S (sunlight readable) illumination is by four 5 volt, T-1, .15 MSCP lamps. Other T-1
lamps are available, with different illumination results. Lamps shall be acquired separately.
Operating characteristics:
Actuation force: 3.5 pounds ±1.5 pounds.
Actuation travel: Actuation occurs when the face of the pushbutton is below the mounting flange.
Lens extraction force: 1 ½ to 4 pounds.
Holding coil: 0.04 ±.01 amperes at 28 V dc. will hold in at 18 V dc and drop out at 14 V dc.
Shock: 75 G sawtooth (MIL-STD-202, method 213, test condition H).
Moisture resistance: Following step 6 of the final cycle of the moisture resistance test, while switches
are still wet, the insulation resistance measurement shall be not less than 5 megohms.
Electrical endurance: See tables III and IV for electrical load conditions. For magnetically held
switches, one cycle shall consist of a mechanical actuation, an electrical hold, and an electrical release.
TABLE III. Electrical ratings - silver contacts. 1/ 2/
Sea level
50,000 feet
Load
28 V dc
28 V dc
115 V ac, 60 Hz
amperes
amperes
amperes
Resistive
7.5
7.5
4
Inductive 3/
5.0
5.0
2.5
Lamp 4/
1.0
1.0
1.0
1/ Minimum conditions are dependent on use and atmospheric
conditions.
2/ For multiple pole switching of maximum rated loads, derate
maximum load rating 30%.
3/ L/R - .026.
4/ Inrush, 10:1 for 20 milliseconds maximum.
6
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