fuse blowing

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Mes,AZ
200 amp jjn fuse keeps blowing and melting main fuse pullout. Problem only occurs when a/c is ran. Recently replaced the fuse pullout and is doing it again. Equipment is square d and is pretty old and beat down. A/C is a 60 amp and fuses are fine in disconnect. When I replaced the fuse pullout I went through and tightened everything. Checked voltages and loads and everything was fine, a/c was at 28amps on #6. This evening it melted the fuse pullout and blew out the B phase fuse. Any suggestions?
 
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