MIL-DTL-13625F
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. Switches covered by this specification are intended primarily for use on tactical
military vehicles but may be found suited to other uses. Type I switches are used for horns (with or
without relays), to close starting motor circuits when contactors or starting relays are employed, and as
firing switches. Type II and type III switches are used for dimming headlamps, blackout lamps, and other
vehicle lamps. Type IV switches are used to close starting motor circuits when contactors or starting
relays are not employed. Type V switches are used for high-current circuits where quick, manual opening
is desired.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of the specification.
b. Type, arrangement, class, and grade of switch (see 1.2).
c. If required, the specific issue of individual documents referenced (see 2.2.1).
d. If terminal connectors other than as specified are required (see 3.3.8).
e. Packaging requirements (see 5.1).
6.3 Definitions.
a. Actuating force. Actuating force is the force applied to the actuator to operate the contacts
(close contacts only).
b. Movement differential. Movement differential is the distance or angle which the actuator travels
from the operating position to the releasing position.
c. Operating force (full travel). Operating force is the necessary force to apply to the contacts for
proper operation.
d. Overtravel. Overtravel is the distance in inches or degrees between the operating positon and
the extreme position to which the actuator may be moved.
e. Pretravel. Pretravel is the distance or angle through which the actuator moves from free position
to operating position.
Releasing force or torque. The releasing force or torque is the value to which the force or torque
f.
on the actuator must be reduced to permit the contacts to return to the unoperated position after
operation.
6.3.1 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may
exhibit tin whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to
years after manufacture and can develop under typical operating conditions, on products that use such
materials. Conformal coatings applied over top of a whisker-prone surface will not prevent the formation
of tin whiskers. Alloys of 3 percent lead, by mass, have shown to inhibit the growth of tin whiskers. For
additional information on this matter, refer to ASTM-B545 (Standard Specification for Electrodeposited
Coatings of Tin).
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