MIL-PRF-22885 Switches, Push Button, Illuminated, General Specification ForThis specification covers the general requirements for manually operated illuminated push button switches, switch assemblies \(see 6.4.1\), and associated modular subassemblies. As used in this specification, the term "switches" should include the associated modular subassemblies, including switches, indicator lights, actuators, lenses, color filters, panel seals, barriers, and so forth.

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MIL-PRF-22885H

FIGURE 10. Specular reflectance test for sunlight readability.

6.4 Definitions.

6.4.1 Switch assembly. Switch assembly is one or more switches that are permanently fixed to a bracket having a

common actuating means, that is, lever, rocker, button, or plunger.

6.4.1.1 Manual switch assembly. A manual switch assembly is one or more switches adapted to or intended for

hand operation, i.e., to be depressed or operated manually and subject to operator variations.

6.4.2 Actuator. The switch actuator is the mechanism of the switch or housing which, when moved as intended,

will operate the contacts.

6.4.3 Actuator free position. Actuator free position is the initial actuator position when there is no external force

(other than gravity) applied on the actuator.

6.4.4 Contact separation. The contact separation distance of a switch is the minimum open gap distance between

the stationary and movable contacts or live parts connected thereto, with moving contact member in the open

position.

6.4.5 Actuating force or torque. Actuating force or torque is the force or torque applied to the actuator to operate

the contacts.

6.4.6 Releasing force or torque. The releasing force or torque is the value to which the force or torque on the

actuator must be reduced to permit the contacts to return to the unoperated position after operation.

6.4.7 Overtravel force or torque. Overtravel force or torque is the force or torque applied to actuating mechanism

to move the actuator to the overtravel limit position.

6.4.8 Contact bounce time. The contact bounce time is the total time between the initial contact and the cessation

of contact opening due to transfer mechanism disturbance. Dynamic contact voltages due to resistance fluctuations

or "white noise" shall not be included in contact bounce time.

6.4.9 Enclosure. An enclosure is an auxiliary housing providing protection and means for mounting and actuating

of the basic switch.