MIL-PRF-23419H
6.3.1 Provisions Governing Qualification. Copies of SD-6, "Provisions Governing Qualification" may be
obtained upon application to DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia,
PA 19111-5094, online at https://assist.dla.mil.
6.4 Supersession data. This specification includes the essential requirements of previous revisions
and supersedes previous type designations (see 3.1).
6.4.1 Background. Previous requirements for fuse style FM03 and FM06 included a current-carrying
capacity rating at 100 percent of the nominal current rating. This prevented a direct correlation between
style F03 fuses of MIL-PRF-15160, which were rated at 110 percent, and the FM03 and FM06. In an
attempt to provide this highly desirable correlation, the style FM09 has been developed. FM09A will have
normal interrupt characteristics and the FM09B will have an intentional time delay (see 1.2.1.2 and 6.5).
This will provide a direct correlation between the F03A and the FM09A, and between the F03B and the
FM09B. The main difference between the style F03 and style FM09 is the known environmental
capability of fuses furnished under MIL-PRF-23419.
6.4.2 Cross reference. Specific cross-reference will be provided on the specification sheet.
6.5 Characteristics. The term characteristic refers to the relative overload interrupt capability of a fuse:
6.5.1 Characteristic A: Commonly referred to as "normal" or "instantaneous". This fuse contains a
single element with no intentional time delay designed into the element, only maximum opening time is
specified.
6.5.2 Characteristic B: Commonly referred to as "time delay". This is a dual element fuse, each
element with a different time/current characteristic; maximum and minimum time is specified.
6.6 Finishes.
6.6.1 Tin-plated finish. Pure tin plating is prohibited (see 3.5.5) since it may result in tin whisker
growth. Tin whisker growth could adversely affect the operation of electronic equipment systems (see
6.7).
6.6.2 Silver-plated finish. Users may want to consult ASTM B700, Standard Specification for
Electrodeposited Coatings of Silver for Engineering Use, as an aid to meeting the performance
requirements of this specification.
6.6.3 Gold plated finish. Users may want to consult the appropriate portions of SAE AMS 2422,
Plating, Gold and ASTM B488, Electrodeposited Coatings of Gold for Engineering Uses as an aid to
meeting the performance requirements of this specification.
6.6.4 Nickel plated finish. Based on past experience, nickel plating .00008 inch (0.0020 mm) thick over
brass and .0002 inch (0.0051 mm) thick over copper, has been used successfully to meet the
performance requirements of this specification.
19
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business