MIL-DTL-917F(SH)
3.13.6.4 Pushbutton switches. Illuminated pushbutton switches shall be in accordance with MIL-PRF-22885.
Non-illuminated pushbutton switches shall be in accordance with MIL-DTL-2212.
3.13.6.5 Mercury switches. Mercury switches shall not be used (see 3.3.1.2).
3.13.6.6 Pressure and thermostatic switches. Pressure and thermostatic switches, except metallic and
bi-metallic types, shall be in accordance with MIL-DTL-2212 or MIL-S-16032.
3.13.6.7 Metallic and bi-metallic thermostatic switches. Metallic and bi-metallic thermostatic switches shall be
in accordance with MIL-PRF-24236.
3.13.6.8 Printed circuit switches. Printed circuit switches shall be in accordance with MIL-PRF-22710.
3.13.6.9 Bus transfer switches. Bus transfer switches shall be in accordance with MIL-PRF-17773 or
MIL-PRF-32150.
3.13.6.10 Rotary switches.
3.13.6.10.1 Control and power circuits. Switches for control and power circuit applications shall be in
accordance with MIL-DTL-15291. SR types shall be utilized for 1SR and 3SR applications. Where more than four
positions are required, switches shall be in accordance with MIL-S-18396 or Style JM or JR of MIL-DTL-21604.
3.13.6.10.2 Instrument, metering, alarm, and test circuits. Switches for all instrumentation equipment and for
metering, alarm, and test circuitry in control equipment shall conform to the following:
a. For voltages of 125 V or less, switches shall be in accordance with Style JK, JL, JM, or JR of
MIL-DTL-21604 or MIL-DTL-3786 and Style SR04 of MIL-DTL-3786/4 modified to include gold plated contacts.
Class SR of MIL-DTL-15291 shall not be used in this service.
b.
For voltages above 125 V, switches shall be in accordance with MIL-DTL-15291 or MIL-S-18396.
3.13.6.10.3 Switch stops. Stops shall be provided to limit rotation of rotary switches to the minimum number
of positions necessary for their application in a system. However, four-position switches having identical alternate
positions shall not be required to have stops when only two positions are needed.
3.13.6.10.4 Enclosed rotary. Enclosed rotary switches shall be in accordance with MIL-DTL-15743.
3.13.6.11 Reed switches. Reed switches shall not be used in new equipment design.
3.13.7 Mounting and fastening.
3.13.7.1 Resistor and capacitor mounting. Resistors shall be securely mounted in such a manner as to allow for
expansion with temperature changes. Capacitors shall be securely mounted. Resistors and fixed capacitors shall not
be mounted by their wire leads without providing other mechanical support for the body of the component, except
that components whose weight is ½ ounce or less may be secured by only their leads if the total length of both leads
measured between the points on the component from which the leads egress and the midpoints of the lead
attachment terminals does not exceed 1 inch. In no case shall the wire leads be less than ¼ inch for components
with axial leads, except for printed circuit applications and in non-repairable items. Requirements herein do not
apply to parts to which IPC-2221 mounting requirements apply.
3.13.7.2 Receptacle and connector mounting. When receptacles are mounted on a vertical surface, the largest
polarizing or prime key or keyway of the receptacle shall be at the top center of the shell of the receptacle, where
practical.
3.13.7.2.1 Similar connectors. The use of similar connectors for interconnecting cables shall be minimized.
When used, similar connectors shall utilize differences in insert arrangement or size, or keying, to prevent
misconnections, unless the connectors are functionally interchangeable.
3.13.7.3 Toggle switch mounting. Requirements for mounting toggle switches shall be in accordance with
MIL-STD-1472.
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