MIL-PRF-15160K
3.5.1 Terminal mounting. Terminals shall be secured to the fuse body so that they will not loosen. The fuse wire
shall be attached to the terminals so that there shall be no danger of breaking the fuse wire or connections when
installing the fuse. The area of the terminal's interface surface that is in direct contact with a fuse carrier or clip shall
be free of solder. There are some fuses in use which have solder on the end of the ferrule. This is permissible
provided their installation meets the above criteria. (see 6.3.8 for further guidance).
3.5.2 Ferrule alignment. Fuses with ferrule terminals shall pass through a tubular gauge having a length equal to
the fuse. The tubular gauge shall have an internal diameter of .010 inch (0.254 mm) greater than the maximum
ferrule diameter for fuse lengths up to and including 1.75 inches (44.45 mm). For fuse lengths greater than 1.75
inches (44.45 mm), the tubular gauge shall have an internal diameter of .015 inch (0.381 mm) greater than the
maximum ferrule diameter.
3.5.3 Terminal alignment. Fuses with knife blade and lug type terminals shall be aligned or shall be capable of
self-aligning so that their planes are within 4 degrees of each other.
3.5.4 Terminal finish or plating. Ferrules or other terminals shall be finished (plated, dipped, coated) or shall be
natural (no finishing process), as specified (see 3.1). When silver plating is specified (see 1.2.1.5), the letter "S" shall
be added as a suffix to the type designation. Additionally, the use of pure tin, as an underplate or final finish, is
prohibited externally. Tin content of fuses and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with
a minimum of 3 percent lead, by mass. Finish shall be optional when not specifically designated. Finishes shall be
used which enable the fuses to meet the performance requirements of this specification. For guidance on finishes,
see 6.3.
3.6 Continuity. Fuses shall have electrical continuity (see 4.7.1).
3.7 Current-carrying capacity. There shall be no evidence of mechanical damage or failure when fuses are tested
as specified (see 4.7.2). Unless otherwise specified on the applicable specification sheet (see 3.1), the temperature
of the case, body, and terminals shall not rise above ambient temperature more than shown in table II when using
either the thermometer or thermocouple method.
TABLE II. Allowable temperature rise in degrees Celsius (°C).
Casing or body
Terminal
Thermometer
Thermocouple
Thermometer
Thermocouple
50
90
50
90
3.9 Terminal strength. Fuse terminals shall not loosen or become damaged (see 4.7.4).
3.10 Overload interrupt. Fuses shall open the circuit within the time limits specified (see 3.1) without causing the
case or body to char or fracture (see 4.7.5). The fuse shall remain in the energized circuit 1 minute minimum without
any indication of the circuit closing again.
3.10.1 Low voltage overload interrupt. The fuses when specified, shall interrupt the overload currents within the
3.11 Short circuit interrupt. Fuses shall remain intact and shall open the circuit (see 4.7.6). The fuse shall remain
in the energized circuit 30 seconds minimum without any indication of the circuit closing again. The insulation shall
not puncture; the ferrules or body shall not rupture or separate, and the terminals shall not be shunted. Fuses shall
not emit flame or molten metal sufficient to ignite surgical cotton surrounding the case.
3.12 Vibration. The fuses, when specified (see 3.1), shall not open when subjected to vibration tests (see 4.7.7).
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