MIL-PRF-19207G
3.5.6 Insulation resistance. Insulation resistance shall be not less than 1,000 megohms (see 4.6.6).
3.5.7 Contact resistance. Contact resistance shall not exceed 0.005 ohms (see 4.6.7). Following the
endurance and moisture resistance tests, the contact resistance shall not exceed 0.010 ohms.
3.5.8 Overload. There shall be no damage and the fuseholders shall be mechanically and electrically
operative (see 4.6.8).
3.5.9 Endurance. Fuseholders shall remain electrically and mechanically operative during and
following the endurance test (see 4.6.9). Deposit of copper from dummy fuse on contacts of fuseholders
shall not be considered failure. At completion of test, the contact resistance shall not exceed the value
specified in 3.5.7.
3.5.10 Temperature rise. Temperature rise of each terminal shall not exceed 70 degrees Celsius (°C)
(see 4.6.10).
3.5.11 Short circuit. There shall be no welding or sticking of contacts, mechanical failure, or damage to
the fuseholder; provided however, that any failure may result from gases or from flames emanating from
the fuse shall not constitute failure of the fuseholder (see 4.6.11).
3.5.12 Indicating lamp (indicating type fuseholders only). The indicating lamp shall remain operative
and be clearly visible (see 4.6.12). No distortion of lens cap shall be permitted.
3.5.13 Vibration. Fuseholders shall remain mechanically and electrically operative and there shall be
no opening of the fuseholder contacts in excess of 10 microseconds (µs) (see 4.6.13). Failure of the fuse
shall not be considered as a failure of the fuseholder.
3.5.14 Mechanical shock. Fuseholders shall remain mechanically and electrically operative during the
test and there shall be no damage (see 4.6.14). Momentary opening of contacts shall not exceed 20
milliseconds (ms). Failure of the fuse shall not be considered as failure of the fuseholder.
3.5.15 Moisture resistance. There shall be no breaking, cracking, spalling, or loosening of terminals
(see 4.6.15). During the tenth cycle, at a relative humidity (RH) of 90 to 95 percent and a temperature of
23°C ±1°C, the insulation resistance shall be not less than 1 megohm. Following the 24-hour conditioning
period, the insulation resistance shall be not less than 50 megohms; the contact resistance shall be as
specified in 3.5.7.
3.5.16 Thermal shock. There shall be no breaking, cracking, spalling, or loosening of parts (see
4.6.17). Fuseholder caps shall be easily removed and replaced without tools (mittens excepted) when
fuseholders are thermally stabilized at temperature of plus 85°C and minus 55°C. After the fuseholder
has returned to thermal stability at room temperature following the final cycle, the insulation resistance
shall be not less than 100 megohms.
3.5.17 Salt spray (corrosion). Fuseholders, including mounting hardware, shall show no evidence of
excessive corrosion (see 4.6.18). Excessive corrosion is defined as that which interferes with the
electrical or mechanical performance and, in the case of plated metals, corrosion which has passed
through the plating and exposed the base metal. There shall be no warping, cracking, or other damage.
Fuses shall be easily replaced when checked 24 hours after removal from the salt spray chamber.
3.5.18 EMI/RFI shielding (when specified, see 3.1). When fuseholders are tested as specified in
4.6.19.1, screen to mounting surface resistance shall not exceed 1 ohm. When fuseholders are tested as
specified in 4.6.19.2, the shielding attenuation shall be not less than 60 dB over the frequency range from
100 MHz to 1,000 MHz, unless otherwise specified (see 3.1).
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