MIL-PRF-23419H
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheets. In the event of any conflict between requirements of
this specification and the specification sheet, the latter shall govern.
3.1.1 Fuses with ratings not covered by a specification sheet. The requirements of this specification
shall apply to fuses with other voltage and current ratings, provided the fuse has the same dimensions
and falls within the minimum and maximum current and voltage rating of an existing specification sheet,
and conforms to all other requirements of that specification sheet. The Qualified Products List (QPL)
shall be applicable to these fuses
3.2 Qualification. Fuses furnished under this specification shall be products that are authorized by the
qualifying activity for listing on the applicable qualified products list before award of contract (see 4.4 and
6.3).
3.3 QPL system. The manufacturer shall establish and maintain a QPL system for fuses covered by
this specification. Requirements for this system are specified in MIL-STD-790 with details as specified in
4.2.
3.3.1 Statistical Process Control (SPC) system. As part of the overall MIL-STD-790 QPL system, the
manufacturer shall establish a SPC system that meets the requirements of EIA-557.
3.4. Material. The material for each part shall be as specified herein. When a definite material is not
specified, a material shall be used which will enable the fuses to meet the performance requirements of
this specification. Note, however, that the tin content of fuse components and solder shall not exceed 97
percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 3.5.5).
Acceptance or approval of any constituent material shall not be construed as a guaranty of the
acceptance of the finished product.
3.5 Interface and physical dimensions. Fuses shall be of the interface and physical dimensions as
specified (see 3.1).
3.5.1 Mounting. Fuses parameters shall allow for convenient insertion and removal from printed wiring
boards, fuseclips, or holders as specified (see 3.1).
3.5.2 Terminal mounting. Terminals shall be secured to the fuse body so that they shall not loosen.
The fuse wire shall be so attached to the terminals that there shall be no danger of breaking the fuse wire
or connections when installing the fuse. Terminals other than the ends to which the fusible elements are
attached shall be free from solder.
3.5.3 Ferrule alignment. Fuses with ferrule terminals shall pass through a tubular gauge having a
length equal to that of the fuse. The tubular gauge shall have an internal diameter of .005 inch (0.13 mm)
greater than the maximum ferrule diameter for fuse lengths up to and including 1.750 inches (44.45 mm).
For fuse lengths greater than 1.750 inches (44.45 mm), the tubular gauge shall have an internal diameter
.010 inch (0.25 mm) greater than the maximum ferrule diameter.
3.5.4 Indication. When specified (see 3.1), the fuse shall be such that it is possible to determine that
the fuse is open, without removing the fuse from the circuit.
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