A/C Clutch fried can I replace it?

[DADS71]

I installed rebuilt compressor from delco store $250-300 this past dec. previous one had blew a seal around clutch. yesterday I was going down hiway and smelled electrical smell (burnt) never a good smell. opened hood clutch was smoken hot. And it fried, the metal ring on front spins and flops around .It seems like this also happened years ago when I had the blower switch in the second notch down from top the clutch wouldnt stay engaged it would pulsate on and off and fried the clutch that time also but in third notch down it stayed engaged and worked fine. I also had it in second notch yesterday. 1st off can you replace just the clutch successfully? and can any body help out on the switc, what would cause 1 location to frie out clutch?