MIL-PRF-15160K
4.4.1 Sample size. Unless otherwise specified (see 3.1 and 4.4.1), the number of fuses to be subjected to
qualification inspection shall be as shown in table III. The numbers shown in the table shall be for each of the
maximum and minimum current and voltage ratings of each style and characteristics shown on the specification sheet
for which qualification is desired. Four additional samples of each of the above fuses shall be forwarded to the
qualifying activity.
4.4.1.1 Samples for fuse label test. Five sample fuses, each of the smallest and largest diameter fuse tubes of
each tube material with appropriate labels which the manufacturer proposes to qualify, shall be subjected to the fuse
label test (see 4.7.9.1).
TABLE III. Qualification inspection.
Inspection
Requirement
Test method
Group I (all samples)
Visual and mechanical examination 1/
Continuity
Current-carrying capacity
Group II (eight samples) 2/
Resistance 3/
Terminal strength
Overload interrupt
Group III (eight samples) 2/
Short circuit interrupt
Group IV (four samples) 3/
Continuity
Vibration
Shock
Group V (four samples) 3/
Low voltage overload interrupt (when specified)
Group VI (five samples) 3/
Moisture resistance (fuse labels)
1/ Physical dimensions need only be measured on four fuses (see 3.1).
2/ Unless otherwise specified (see 3.1).
3/ When applicable (see 3.1).
4.4.2 Inspection routine. Sample units selected in accordance with 4.4.1 shall be subjected to the inspection of
table III, group I. Unless otherwise specified (see 3.1), the samples shall then be divided as specified for the
remaining groups, excluding group VI, and subjected to the inspection for their particular group in the order shown.
The samples of 4.4.1 shall be subjected to the group VI (fuse label) test.
4.4.3 Failures. One or more failures shall be cause for refusal to grant qualification approval. If one or more
samples explode or show signs of any missing glass parts, the qualification inspection shall be terminated.
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