A/C Compressor

[clb181182]

I have a 04 Discovery. I have had 3 a/c compressors put in the car. All 3 have had the clutch sieze and burn up. Can someone please tell me why this keeps happening and what I need to do to keep it from happening again?!
Thanks,
Cheri

[Joey]

Are these used compressors or new? If new I hope the person doing the work is making sure it has the right amount and correct oil. I Used you sadly can't say how long a used unit has been sitting around.