MIL-DTL-24317B
3.4.4.7 Locking and interlocking with remote release. Each pushbutton station shall lock down when
depressed and shall release by depressing a special momentary release station. Only one pushbutton
may be depressed at a time.
3.4.4.8 Locking and interlocking with remote release. Each pushbutton station shall lock down when
depressed and shall release by energizing an electromagnetic device. Only one pushbutton may be
depressed at a time.
3.4.4.9 Remote release and lockout. The energizing of an electromagnetic device shall release all
stations and then shall prevent actuation of any station until the electromagnetic device is deenergized.
3.4.4.10 Tease-proof. One pushbutton station in a multistation switch shall always be in a down
position with its associated circuitry activated. Depressing any other pushbutton station shall not cause
deactuation of activated circuits until pushbutton station being depressed is positively committed to
activating its associated circuitry.
3.4.5 Circuit characteristic (when applicable, see 3.1). Switch station circuitry shall be as specified.
3.4.6 Lamps (when applicable, see 3.1).
3.4.6.1 Circuitry. The lamp circuit shall be independent of the switch circuit and shall be insulated from
the switch housing.
3.4.6.2 Replacement. The lamps shall be replaceable from the front of the panel with the complete
assembly mounted in the panel. Unless otherwise specified (see 3.1), tools shall not be required to
replace the lamp.
3.4.6.3 Contact and springs. Lamp contacts shall be of a copper base alloy and shall be suitably
plated. Lamp contact springs shall be beryllium copper, suitably plated, or shall be corrosion resistant
steel. When the contact and contact spring are combined in an integral part (one piece of metal), copper
beryllium alloy, suitably plated, shall be used.
3.4.6.4 Type. Unless otherwise specified (see 3.1), switches shall accept type T-1-3/4 midget flange-
base lamps.
3.4.6.5 Failure. Lamp failure shall not be considered a unit failure if, when the lamp failure is noted, a
new lamp is installed immediately and the lamp functions. The test being performed shall then be
continued as required.
3.4.7 Lens (when applicable, see 3.1). The lens design shall be as specified and shall permit the
application of legends, when applicable, (see 6.2). Abbreviations on the legends shall be in accordance
with ASME-Y14.38. The lens, excluding the switch housing mating portion, shall be of heat resistant
thermoplastic material, or thermosetting plastic as specified (see 3.1). The lens shall be removable from
the front of the panel. The lens shall not rotate or loosen during the applicable tests. The lens shall be
free from defects which will prevent it from meeting luminous distribution and color requirements.
Threaded plastic lens shall not be used (see 3.4.12).
3.4.7.1 Snap-in type. Snap-in lens shall be designed to have a lens removal force between 2 and 4
pounds, and after 50 insertions and withdrawals, the lens removal force shall not have varied over 50
percent from the measured initial lens removal force. Snap-in lens shall not be used for push-pull
operative switches.
3.4.7.2 Color. The lens color shall be as specified (see 3.1) and shall be evenly distributed over the
lens face. Unless otherwise specified (see 3.1), the lens color shall be in accordance with table III.
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