MIL-DTL-13623E
4.8.5 Temperature resistance. To determine conformance to 3.4.5, the switch shall be tested at
extremes of low and high temperature as specified in 4.8.5.1 and 4.8.5.2. During each of these tests the
switch shall be energized by a 28 V dc source and connected to the rated loads specified on the
applicable drawing. The switch shall be operated through its entire range 1000 times. For lamp loads,
the load cycle shall be 1 + 0.1 seconds "on" and 5 + 0.1 seconds "off" (10 cycles per minute). The
inductive load shall be 3 + 0.1 seconds "on" and 3 + 0.1 seconds "off" (10 cycles per minute). The switch
shall then be tested for operating, torque in accordance with 4.7.5(a). These tests shall be performed in a
chamber capable of maintaining air temperatures of minus 65ºF and plus 165ºF. Air movement during
high temperature exposure shall be held to a minimum to prevent a temperature gradient and any cooling
resulting from excess air motion.
4.8.5.1 Low temperature. To determine conformance to 3.4.5.1, the switch shall be placed in a cold
chamber and conditioned for 24 hours prior to testing at minus 65 ± 5ºF. Then, with the chamber
temperature constant at minus 65 ± 5ºF. the switch shall be operated and tested as specified in 4.8.5.
Verify that operating torque conforms to 3.4.5.1 and that there is no degradation of electrical and
mechanical performance.
4.8.5.2 High temperature. To determine conformance to 3.4.5.2, the switch shall conditioned and
tested as specified in 4.8.5.1, except that constant temperature shall be plus 165 + 5ºF.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging
activities within the Military Service or Defense Agency, or within the military service's system commands.
Packaging data retrieval is available from the managing Military Department's or Defense Agency's
automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.
6. NOTES
6.1 Intended use. Rotary switches covered by this specification are intended primarily for use on
tactical vehicles.
6.1.1 Class 3 switches. Switches that are non-waterproof, except that operating shaft resists entry of
water, are for installation as components of sealed, waterproof assemblies containing non-waterproof
items enclosed in waterproof housings.
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