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Panel Mount. Any component that attaches to a side panel of a chassis. Normally a panel mount component will use the chassis wall as an attachment point as it protrudes through the chassis wall allowing connections or interaction to either side of the component. Panel-mount components could be switches, Fault Indicators, connectors, Fuse Holders, LEDs and so on.
Here are just a few examples
Panel Mount LED
Panel mount LEDs are a bit less common these days, as many designers may just select a lighted switch or lighted fuse holder to indicate power reaching the chassis or boards. Why add in an additional LED and the wiring associated with it when a lighted power switch will do the same thing. However if there is a requirement to indicate a particular power supply, than a separate LED may be required.
I show a fault indicator only to show that there could be a requirement for one, but after 25 years designing as an electrical engineer, I have never seen one.
Panel Mount Fault Indicator
A panel mount fuse holder of course is much more common, being found in almost ever chassis design I can think of.
Panel Mount Fuse Holder
How To Specify a Equipment Chassis; Index page
