MIL-DTL-9419G
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheet. In the event of any conflict between the requirements
of this specification and the specification sheet, the latter shall govern.
3.2 Qualification. Switches furnished under this specification, shall be products which are authorized
by the qualifying activity for listing on the applicable qualified products list at the time of award of contract
3.3 Material. Material shall be as specified herein. When a definite material is not specified, a material
shall be used which shall enable the switches to meet the performance requirements of this specification.
Acceptance or approval of any constituent material shall not be construed as a guarantee of acceptance
of the finished product.
3.3.1 Metals. All metal parts, other than current-carrying parts, shall be of corrosion-resistant material,
or shall be suitably plated to resist corrosion.
3.3.1.1 Ferrous material. Ferrous material shall not be used for current carrying parts.
3.3.1.2 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 which, in
contact, tend toward active electrolytic corrosion (particularly brass, copper, or steel used in contact with
aluminum or aluminum alloy) is not acceptable. However, metal plating or metal spraying of dissimilar
base metals to provide similar or suitable abutting surfaces is permitted. The use of dissimilar metals
separated by a suitable insulating materiel is also permitted. For further guidance on the selection and
use of metals see 6.7.
3.3.2 Insulating material. Molded material shall be used. Cellulose-filled phenolic shall not be used.
3.3.2.1 Plastic. The plastic material used in all external switch parts and enclosures shall be tested in
accordance with UL94 and classified as 94V-0; this requirement applies to all materials for external parts
and enclosures regardless of whether the material used is acquired to a detail specification or not.
3.3.3 Protective treatment. Materials that are subject to deterioration when exposed to climatic and
environmental conditions likely to occur during service usage shall be protected against such
deterioration in a manner that will in no way prevent compliance with the performance requirements of
this specification. The use of any protective coating that will crack, chip, or scale with age or extremes of
climatic and environmental conditions shall be avoided.
3.4 Interface and physical dimensions. Switches shall be of sufficiently rugged construction to meet
the requirements of this specification. Switches shall be direct acting, normally open type incorporating a
positive action to assure good contact and snap feel with quick-make and quick-break circuits. Switches
shall be designed to permit manual centering to the "off" position which shall permit breaking of welded
contacts. Switches shall be constructed to assure free return of the movable contact member to the
neutral "off" position when relieved of any external actuation forces. Switches shall not permit dual
contact in any possible position of the lever. Movement of the actuating lever shall close the circuit
between the common terminal and each other terminal in the direction of lever travel, as indicated in the
circuit diagram of the MS sheet or detail specification sheets.
3.4.1 Dimensions. Switches shall conform to the dimensions shown on the MS sheet or detail
specification sheets.
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