Both are momentary. To do the hard turn off though, you need to hold down on the power off for 5 seconds. Don't know if that will be a factor in your switch. A SPDT switch should do it though.
Actually you need a momentary version of U. There are two wires for each action and you'd run one set to the poles on one side of the switch for down (one to the center one to the top) and for the other action you'd run the wires to the other side of the switch for up which would the the center and lower pole.
Safer that way than trying a common ground since there's no telling how the mobo MFG's do their turn on and reset.
You could just run both ground wires to the center post with no problem. Either way is good. If it wasn't a connected ground on the both of them it wouldn't trigger the opposite, and if it was, just gives two grounds to the active side.
Is there anyway around 5 second to turn off?
How does power switch on my dell works since it only takes tap to turn it off? No holding 5 seconds. What I'am missing?
It would be the same with any PC, it's just a case of holding it 5 seconds if the PC hangs, BSOD's, Etc. Your Dell is the same way, it it hangs or blue screens or what have you and you need to power it down you have to hold the button in for 5 seconds.
you will go through quite a few power supplies if you keep doing that. I have found computers though that are so screwed, even the 5 second button push won't work.
To turn it on you move the toggle to the top (as per your diagram) and release and it will return to center (off or no contact) and the PC will power up. To turn the PC off just do the same thing. If the PC hard locks hold it up for five seconds and it will shut down. To reset push the switch down momentarily and it will reset.
And no, turning the power switch off on your PSU won't kill it unless it's a POS power supply to begin with. That said, it is a Dell we're talking about so it could have undesirable results.A quality PSU won't have a problem with it though.
if you are talking about the wires from the front panel to the motherboad, almost nothing, its low voltage and current and basically they just short out the pins on the motherboard to signal the switch has been pushed. So if you were looking for that information in regards to the switch question above, almost any switch you buy will have way way more current and voltage capacity that you will actually need. 12V 1/4 amp would be over kill.
I found what I was looking for and now off to my new project looking for fan controller for 5 fans with variable control from 5 to 12 volt. Hoping for cool display under $50.00