MIL-PRF-24236D
SOCIETY OF AUTOMOTIVE ENGINEERS
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Circuit Breaker, Trip Free, Push-Pull, 5 thru 50 AMP, Type I
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Circuit Breakers, Trip-Free, Aircraft, General Specification for
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Terminal, Lug Splices, Conductor, Crimp Style, Copper
(Copies of these documents are available online at https://www.sae.org or from Society of Automotive Engineers, 400
Commonwealth Drive, Warrendale, Pennsylvania, 15096-0001)
2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited
herein (* except for related associated specifications, specification sheets, or MS sheets), the text of this document
takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific
exemption has been obtained.
3. REQUIREMENTS
3.1 Requirements for individual switches. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheets. Where there is no specification sheet available, the individual
part requirements shall be as specified in complementary documents or ordering information (see 6.2.2). In the event
of any conflict between requirements of this specification and the specification sheet or complementary document, the
latter shall govern (see 6.2).
3.2 Switch category. Switches furnished under this specification shall be category I, as defined herein.
3.2.1 Category I. Switches completely defined by a military specification sheet.
3.3 Qualification. Category I switches furnished under this specification shall be products which are qualified for
listing on the applicable qualified products list prior to the award of a contract.
3.4 Material. Materials shall be used which enable the switches to meet the performance requirements of this
specification
3.4.1 Plastic. Unless otherwise specified (see 3.1 and 6.2.2), Molded plastic material, when used, shall be
selected to enable the switch to meet the performance requirements of this specification. For additional information
and guidance on molded plastic material see 6.5.
3.4.2 Metals. All metal parts exposed to environmental conditions shall be of a corrosion-resistant material or shall
be suitably plated to resist corrosion.
3.4.2.1 Dissimilar metals. When dissimilar metals are used in intimate contact with each other, protection against
electrolysis and corrosion shall be provided. The use of dissimilar metals in contact, which tend toward active
electrolytic corrosion (particularly brass, copper, or steel used in contact with aluminum or aluminum alloy) is not
acceptable. However, metal-spraying or metal plating of dissimilar base metals to provide similar or suitable abutting
surfaces is permitted. The use of dissimilar metals separated by a suitable insulating material is also permitted. For
additional information and guidance on dissimilar metals see 6.4.
3.4.2.2 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally.
Tin content of switch components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.4.1).
3.4.3 Rubber. Where rubber is used it shall be capable of meeting the environmental performance requirements of
this specification.
3.4.4 Ceramic. Ceramic insulation shall be capable of meeting the environmental performance requirements of
this specification.
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