MIL-PRF-23419/12E
Low temperature operation: Fuses shall be mounted by their terminals in sockets and placed in a low
temperature chamber. The chamber temperature shall be lowered gradually to -55°C +0°C, -3°C within
a period of 1 hour. After stabilizing at the low temperature for 1 hour, rated dc current shall be applied
to the fuses for a period of 4 +1, -0 hours while at the low temperature. The chamber shall then be
gradually raised to room temperature over a 4 hour period and maintained at room temperature for a
period of 8 hours minimum. After this time, the dc current shall be removed from the fuses and the
fuses removed from the chamber. The DC resistance of each fuse shall be measured before and after
testing in accordance with MIL-PRF-23419. The change in resistance shall not exceed ±10 percent
from the initial value.
Life (2,000 hours): Fuses shall be mounted by their terminals in sockets and mounted in a chamber at
+125°C +3°C, -0°C ambient. The fuses shall be electrically connected to a dc source supplying each
fuse with 64 percent of the +25°C rated value of current. The fuses shall remain in the chamber at
specified current for 2,000 ±8 hours. The electrical circuit shall provide a suitable indicator, which shall
be monitored daily during the length of the life test, to identify failure (blowing) of any fuse. The time of
failure shall be recorded to the nearest ±12 hours and the blown fuse replaced with a short circuit for
the remainder of the test. The DC resistance of each fuse shall be measured before and after testing
as specified in MIL-PRF-23419 and shall not have changed by more than ±10 percent.
Solderability: Fuses shall be tested in accordance with method 208 of MIL-STD-202. Gold plated leads
shall have the gold removed by single or double dipping into a flowing or nonflowing hot solder of
sufficient volume to assure complete gold removal.
Moisture resistance: Fuses shall be tested as specified in MIL-PRF-23419. The DC resistance of each
fuse shall be measured before and after testing and shall not have changed by more than ±15 percent.
Dielectric withstanding voltage: Fuses shall be tested in accordance with method 301 of MIL-STD-202.
Fuses shall be mounted in a test fixture capable of exposing all major surfaces of the fuse body and the
leads to the test voltage. The test voltage shall be applied to the terminals electrically tied together and
to the test fixture. The following details shall apply:
a. Test voltage: 500 V rms.
b. Duration: 5 seconds for group A inspections.
60 seconds for qualification inspections.
c.
Leakage current: 1 milliampere maximum.
d. Measurements: DC resistance of the fuse after the dielectric withstanding exposure in
accordance with MIL-PRF-23419.
This test shall become part of the group I test under qualification and group A inspections.
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