MIL-DTL-12211G
3.5.2 Fungus resistance. Switches shall withstand 90 days of exposure to fungus with no degradation
in performance (see 4.8.2).
3.5.3 Immersion. Switches shall meet the requirements specified in 4.8.3 and there shall be no
evidence no leakage.
3.5.4 Extreme temperature resistance. Switches shall open and close within the pressure ranges
specified herein or on the applicable MS standard or drawing, within a temperature range of minus (-) 65
to plus (+) 250 degrees Fahrenheit (F) (see 4.8.4).
3.5.5 Shock. Switches shall withstand an acceleration force of 50 gravity units (g's) applied once in
each direction of each axis of the switch. During shock application, switches shall be energized and a
pressure of 10 psi above the upper actuation pressure specified on the applicable MS standard or
drawing or table II, as applicable, shall be applied to type I switches. Similarly, a pressure of 10 psi below
the lower actuation pressure shall be applied to type II switches. Switches shall not actuate during shock
application and shall evidence no loosened, distorted or broken parts (see 4.8.5).
3.5.6 Vibration resistance.
3.5.6.1 Class 1 switches. Class 1 switches shall withstand vibration amplitude of .03 inch (0.7 mm) or
50 g's, whichever is less, in a cycle range of 10 to 3,500 Hz, applied in each direction of each axis of the
switch. During vibration, switches shall be energized and pressure applied as specified in 3.5.5.
Switches shall not actuate during vibration and shall evidence no loosened, distorted, or broken parts
(see 4.8.6.1).
3.5.6.2 Class 2 switches. Class 2 switches shall withstand vibration as specified in 3.5.6.1, except
amplitude, frequency, and conditions shall be as specified in test condition A, method 204 of MIL-STD-
3.6 Endurance. Switches shall evidence no malfunction after being cycled 10,000 times from 0 psi to
twice the actuation pressure specified on the applicable MS standard or drawing, then back to 0 psi. The
changes in the pressure at which the switch contacts open and close shall be no more than 8 percent of
the actuation pressure specified on the applicable MS standard or drawing (see 4.9).
3.7 Marking. The switch shall be marked in accordance with MIL-STD-130 and as specified on the
applicable military drawing or standard. Marking shall include the following information, in the order
shown (see 4.7.2):
Switch, pressure
Military part number
Type, grade and class
Actuating pressure limits
Manufacturer's part number
Manufacturer's name.
US
3.8 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
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