MIL-PRF-23419/12E
REQUIREMENTS:
Interface and physical dimensions: See table I and figures 1, 2, 3, or 4.
Case material: Polyphenylene sulfide (PPS) or equivalent.
Internal construction: The fuse element shall be a thick film material printed on a thermally insulated
substrate and sealed with a thick film arc suppressive glass.
Terminals:
Material: CDA-102 Copper.
The gold underplate shall consist of a minimum of 50 microinches of nickel). The Knoop Hardness
range shall be an ASTM code C.
Strength: Five pounds applying force axially to each fuse, and one pound of force applying three
bends to each terminal.
Outgassing: Material shall meet the outgassing requirements specified in MIL-PRF-23419.
Current rating: See table I.
Voltage rating: See table I.
Current carrying capacity: 100 percent at +25°C;110 percent at -55°C; 80 percent at +125°C. Current
carrying capacity is independent of vacuum conditions. The temperature of the case or terminals shall,
at no point, rise more than +85°C above the ambient air temperature. The maximum temperature rise
for 6.0, 7.5, 10, 15, and 20 ampere fuses shall be +120°C.
Resistance: See table I.
Overload interrupt: Interrupt time from -55°C through +125°C shall be as specified in table I. The
following exception shall apply for interrupt times at -55°C and 250 percent overload current:
a. Fuse ratings of 1.0 ampere and less shall open in 10 seconds maximum.
b. Fuse rating greater than 1.0 ampere shall open in 5 seconds maximum.
c.
Fuse ratings less than 3/8 ampere shall open in 60 seconds maximum.
For group B, group C, and qualification inspections, the power supply shall have an open-circuit voltage
of not less than that of the specified voltage rating of the fuse under test. Opening times (the interval
measured from the application of current to the time the current drops below the rating of the fuse) shall
be made with an oscillogram for periods shorter than 1 second.
Short circuit interrupt: 1,000 amperes at maximum voltage dc.
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Maximum current clearing I t: The maximum current clearing I t shall be in accordance with
MIL-PRF-23419 and shall be as specified in table I.
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