That's cos these guys run 24x7 and a switch is not useful.
You can put a switch on the case. Any mains rated 10A switch would be fine. The ones you get from electronics stores for equipment would be a lot neater than the in-line version. I just looked up this one from Radio Schlock's US on-line catalog at <$3. Only 6A rating but it would do the job and easy to mount. Just drill one hole and cut the active supply wire. There are plenty of variations on these mains switches for equipment.
Originally Posted by fordman86
I have a converted atx power supply and like how it has a shut off on the back. Bought this DSP-600PB B and noticed it didn't only unplug it to shut off. So wanted a way to hook up a shut off switch to have the same effect as the one on the atw supply. Have the case apart would like a switch on the case but the inline will do I guess.