MIL-PRF-19207G
3.3.2 Plastic material.
3.3.2.1 Body molding. Plastic materials used for the body and carrier moldings shall be selected to
enable the fuseholder to meet the performance requirements of this specification (see 6.6). Plastic
materials shall be non-fungus nutrient or shall be treated to resist fungus growth. The color of plastic
moldings, except transparent caps, shall approximate a light gray semigloss 26307 of FED-STD-595 or
equivalent, or black as approved by the qualifying activity.
3.3.2.2 Caps (see 3.4.3).
3.3.3 Metals. Metals shall be of a corrosion-resistant type or shall be treated to resist corrosion.
3.3.3.1 Finish, fuse mating surface. Unless otherwise specified (see 3.1), current carrying fuse mating
contact surfaces shall be silver plated. Finishes shall provide a good electrical contact to meet the
performance requirements of this specification. For guidance on these finishes, see 6.5.1.
3.3.3.2 Finish, non-mating surfaces. Unless otherwise specified (see 3.1), surfaces which do not
contact the fuse shall meet the performance requirements of this specification. For guidance on these
finishes, see 6.5.2.
3.3.4 Gaskets. Gaskets, when required (see 3.1), shall be furnished with the fuseholder.
3.3.5 Indicator lamps. Unless otherwise specified (see 3.1), glow lamps, incandescent lamps, or white
light emitting diodes (LED) shall be used provided they meet the performance requirements specified
herein. For guidance on glow and incandescent indicator lamps, see 6.8.
3.3.6 Resistors. Resistors used with indicating lamp type fuseholders shall be as specified in the
applicable specification sheet (see 3.1).
3.4 Interface and physical dimensions. Fuseholders shall be of the interface and physical dimensions
3.4.1 Extractor post type. Extractor post type shall be for panel mounting and shall consist of a tubular
body or other enclosure and a removable cap assembly which together encloses the fuse and provides
for ready removal and replacement of the fuse from the front of the panel.
3.4.2 Indicating type. Indicating fuseholders shall be of the lamp or mechanical type (see 3.1). Lamp
type fuseholders shall have an indicator lamp which lights when the fuse has blown. Mechanical type
shall be provided with clear caps to permit visual examination of the fuse indicator.
3.4.3 Caps. Caps for fuseholders with indicator lamps shall be made from plastic (see 6.7). Plastic
material used for the caps shall be selected to enable fuseholders to meet the performance requirements
of this specification. Caps containing neon lamps or mechanical indicators shall be clear, and essentially
colorless. Caps containing incandescent lamps or LED indicators shall be clear or amber color.
3.4.4 Ground test point. Ground test points shall be provided when required (see 3.1). The test points
shall be in electrical contact with the associated load terminals of the fuseholders. The circuits shall be
independent of fuses, resistors and indicator lamps. Unless otherwise specified, the test point contact
shall be recessed a minimum of .125 inch (3.18 mm) from the outer surface of the cap. The test point
holes shall accommodate a test prod .080 inch ±.001 inch (2.03 mm ±0.03 mm) in diameter and shall
facilitate insertion of the test prod. Test point contacts accessible from the extension of assembled
fuseholders (caps in place) shall be recessed .062 inch to .375 inch (1.57 mm to 9.53 mm) within the test
point holes. The degree of enclosure requirement shall not be diminished by the test point provision.
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