MIL-DTL-28827C
TABLE VI Short circuit wire sizes and circuit breaker or fuse designations
Resistive rating at
Specification
Circuit breaker
lowest voltage, amperes
SAE-AS50861 wire size
or fuse
Less than 5
AN-20
MIL-PRF-15160/2, characteristic A,
rating, as applicable
5
AN-20
MS25017-5
7.5
AN-18
MS25017-7
10
AN-18
MS25017-10
15
AN-18
MS25017-15
18
AN-16
MS25017-20
20
AN-16
MS25017-20
25
AN-14
MS25017-25
30
AN-14
MS25017-30
40
AN-12
MS25017-50
specified (see 3.1). The following details and exceptions shall apply:
a. Tests and measurements prior to vibration Not applicable.
b. Mounting Switches shall be mounted by their normal mounting means on a rigid metal
panel. The mounting fixture shall be free from resonances over the test frequency range.
c. Electrical load conditions The electrical load shall consist of the monitor circuit only.
d. Measurements during vibration Switch contact stability shall be continuously monitored
during vibration. If more than one contact pair is being monitored simultaneously by one
chatter indicator, open contact pairs shall be connected in parallel and closed contact pairs
shall be connected in series during this test. In the event of indication of a contact opening
greater than specified, the test shall be modified so that switches may be individually tested
to determine if a switch is defective.
e. Measurements after vibration Calibration (see 4.7.3).
f. Examination after test Switches shall be examined for change in actuated position, and
evidence of broken, deformed, displaced or loose parts.
4.7.16.1 Vibration, high frequency
a. Method 204 of MIL-STD-202.
b. Test condition letter A, B, C, or D as specified (see 3.1).
c. Method of determining resonance, and measurements during test All checks for resonance
and contact disturbance shall be conducted with the switches being cycled between actuation
and deactuation at a switching rate of three cycles per minute, with the temperature rise and
decay rate not exceeding 10 degrees per minute within 10 degrees of the switching points.
d. Switches shall be subjected to two cycles of operation at each of the following frequencies
5, 10, 20, 40, 80, 100, and every 100 Hz to and including 2,000 Hz, except that test condition
A shall be to 500 Hz. If resonance is detected, the switches shall be vibrated for 20 minutes
at each resonance observed.
e. Contact disturbances shall be monitored within 10 percent of the switching points on a multi-
channel recording device with a minimum response of 2,000 Hz at tape speeds (inches per
second) sufficient to indicate a 250 microsecond time interval.
f. The recordings need not be submitted with the qualification test report. However, the report
shall state that the test was successfully accomplished, the recordings shall be maintained by
the manufacturer for the three year period, and the recording shall be made available upon
request by the preparing activity.
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