Where is your refrigerant expunged from?
If it is a pressure release, most are set for 550 psi and that is way to high a pressure. The more 'modern' / safer way is to use a high pressure switch which shuts off the compressor.
Have you connected up a/c gauges to read what is happening?
Is your condenser fan working or working correctly? This is a common reason for high pressures.
What else does your fuse that blows also control?
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