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MIL-PRF-22710 Switches, Code Indicating Wheel \(Printed Circuit\), Thumbwheel And Push-Button, General Specification ForThis specification covers the general requirements for illuminated and non-illuminated, thumbwheel \(see 6.4.1\), and push-button, printed circuit rotary switches having unsealed and sealed modules and the associated hardware. These switches are designed for low power alternating current \(ac\) and direct current \(dc\) switching applications for use in electronic and communication equipment. Procurement of switches and mounting hardware will require additional data, giving detailed electrical and mechanical requirements, tolerances, and applicable additions and exceptions to the general requirements and tests specified herein \(see 6.2\).

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MIL-PRF-22710H
1.2.2.2 Construction. The construction of the switch is identified by a single letter as specified in the applicable
specification sheet (see 3.1) in accordance with table I.
TABLE I. Switch construction.
Symbol
Construction
A
The switch module (see 6.4.2) should be removable and replaceable from the front of the panel
without requiring the use of special tools or access to the rear of the panel, or without disturbing any
of the other switch modules, and should provide a connector-type termination to allow removal of the
module without unsoldering or disturbing any wires. Removal of a switch assembly escutcheon plate
prior to removal of the module is allowable.
The switch module should be replaceable without requiring the use of special tools after the switch
B
assembly is removed from the panel. The switch module must remain complete and self-contained
and provide a connector-type termination to allow removal of the module without unsoldering or
disturbing any wires.
For externally operated shaft or remotely driven units. Wafers should be removable and replaceable
C
without unsoldering any wires and should be capable of being individually installed or removed from
the switch assembly without removal of or disturbing any other switch wafers that comprise the
switch assembly. A design of the switch assembly will be unacceptable if it in any manner utilizes
bolts for holding the wafers in the switch assembly or wafer replacement requires the removal of any
springs, detents, or subassemblies.
Switch sections (see 6.4.3) or modules that require a major disassembly or unsoldering in order to be
D
replaced.
1.2.2.3 Angle of throw (see 6.5). The angle of throw is identified by a two-digit number as specified on the
applicable specification sheet (see 3.1). For angles of throw that are fractions of a degree, the closest, lower, whole
number should be used.
1.2.2.4 Temperature-life characteristic. The temperature-life characteristic is identified by a single letter as
specified on the applicable specification sheet (see 3.1), indicating the temperature range and electrical rotational life
of the switch in accordance with table II.
TABLE II. Temperature-life characteristic.
Temperature range (°C)
Symbol
Life (rotational)
cycles
Minimum
Maximum
A
25,000
-65
+125
B
50,000
-65
+85
C
100,000
-65
+85
D
50,000
-65
+125
1.2.2.5 Vibration grade. The vibration grade is identified by a single digit as specified on the applicable
specification sheet (see 3.1), in accordance with table III.
TABLE III. Vibration grade.
Symbol
Frequency range (Hz)
1
10 to
55
2
10 to  500
3
10 to 2,000
2



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