MIL-DTL-15291G
3.5.8 Stationary contact material. Stationary contact material shall be selected to enable the switch to
meet performance requirements of this specification. Threaded holes shall have not less than three full
threads. For additional information and guidance on stationary contact material see 6.14.
3.5.9 Contact studs. For rear connected switches, the contact studs shall allow the switch to meet the
performance requirements of this document. For additional information and guidance on contact studs
material see 6.15.
3.5.10 Handles. Unless otherwise specified (see 6.2), switches shall be provided with handles as
specified (see 3.1).
3.5.11 Operating shafts. The operating shaft shall be insulated from current carrying members.
3.5.12 Rear support for front mounted switch assemblies. Rear support is recommended for front
mounted switch assemblies where the total number of decks, including spacers, exceeds 9 and shall
have features which will readily allow attachment of brackets or other supports to the rear of the switch.
3.6 Performance.
3.6.1 Operation. Class SR switches shall transfer from one position to the next adjacent position, in
either direction, when the handle shafts are rotated not more than 135 degrees from the initial position.
Class SRN switches shall transfer similarly when the handle shafts are rotated 60 to 90 degrees. Unless
otherwise specified, the rest positions of switch handles shall be integral multiples of 90 degrees, with a
non-cumulative tolerance of plus or minus 3 degrees, from the off or normal positions (see 3.1). Switches
having limited rotation (stop) or momentary positions (spring return to a detented position) shall not
change circuit continuity, open or closed as specified, when rotated into a stop from the adjacent detented
or momentary position.
3.6.1.1 Momentary position return. The handle shaft shall return to the rest position, within plus or
minus 5 degrees and each contact shall return to the condition (open or closed) that is normal in the rest
position (see 4.7.1.1). After return to rest position, handle shaft float shall not exceed 3 degrees. This
requirement is applicable to classes 1SR and 1SRN only.
3.6.1.2 Stop strength (applicable to switches with stops). The stop shall not be overrun, and there shall
3.6.1.3 Transfer time (applicable to snap action transfer only). The transfer time shall not exceed ten
milliseconds (4.7.1.3).
3.6.2 Salt spray (corrosion). There shall be no evidence of excessive corrosion (see 4.7.2). Excessive
corrosion is defined as corrosion which interferes with the electrical or mechanical performance, or, in the
case of plated metals, corrosion which has passed through the plating and exposed the base metal. After
the test, mounting and terminal hardware shall be readily removable.
3.6.3 Vibration. There shall be no opening of closed contacts in excess of 10 microseconds. There
shall be no change in shaft position or evidence of broken, loose, deformed, or displaced parts (see
4.7.3).
3.6.4 High-impact shock. Switches shall remain mechanically and electrically operative and there shall
be no opening of closed contacts in excess of 20 milliseconds, or closure of open contacts, or evidence of
broken, loose, deformed, or displaced parts (see 4.7.4).
3.6.5 Dielectric withstanding voltage. Switches shall withstand the application of the specified voltages
without arcing, breakdown of insulation, or damage, and there shall be no leakage current greater than
100 microamperes (see 4.7.5).
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