MIL-PRF-23419H
3.5.5 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. Finish shall be optional when not
specifically designated and shall enable the fuses to meet the performance requirements of this
specification. However, the use of pure tin, as an underplate or final finish, is prohibited both internally
and externally. Tin content shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of
3 percent lead, by mass (see 6.7).
3.6 Continuity. Fuses shall have electrical continuity (see 4.7.2).
3.7 Resistance (when applicable (see 3.1). Fuses shall have electrical resistance as specified (see 3.1
and 4.7.3).
3.7.1 Voltage drop (when applicable (see 3.1). Fuses shall have the voltage drop as specified (see 3.1
and 4.7.3.1).
3.8 Current-carrying capacity. Fuses shall show no evidence of mechanical damage and shall carry
current as specified (see 3.1) without electrical failure. Unless otherwise specified, the temperature of the
case, body, or terminals shall not rise more than 70°C above room ambient temperature (see 3.1 and
4.7.4).
3.9 Terminal strength. Fuse terminals shall not become damaged when subjected to the specified
3.10 Overcurrent.
3.10.1 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. The circuit shall remain open without the circuit closing
again during the one-minute period after interrupt. There shall be no mechanical failure (see 4.7.6.1).
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3.10.2 Maximum current clearing I t (when specified, (see 3.1). When fuses are tested as specified in
4.7.6.2, the amount of ampere-squared seconds passed by the fuse during melting, arcing, or clearing
time shall not exceed the value specified (see 3.1).
3.10.3 Short circuit interrupt. Fuses shall remain intact and shall open the circuit. The fuse shall
remain in the energized circuit for 30 seconds minimum without any indication of the circuit closing again.
The insulation shall not puncture, the terminals or body shall not rupture or separate, and the terminals
shall not be shunted (see 4.7.6.3).
3.11 Outgassing (when specified, (see 3.1). When the fuses or the fuse materials are tested as
specified in 4.7.7, the materials shall meet the following requirements:
Total mass loss (TML) ----------------------------------- Shall not exceed 1.0 percent.
Collected volatile condensable material (CVCM) -- Shall not exceed 0.1 percent.
Materials data listed in the latest revision of the NASA Reference Publication 1124 which meet these TML
and CVCM requirements may be substituted in lieu of testing.
3.12 Vibration.
3.12.1 Vibration, high frequency. When tested as specified in 4.7.8.1, there shall be no electrical or
mechanical damage to the fuse.
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