Is the fuse blowing when the rig starts (for example, after power outage) or in normal use?
What kind of fuse you have, is it automatic circuit breaker or old type one-time-use fuse?
It is happening while rig is on for several days. The fuse is old style one time use.
have you checked logs or anything to see if a mining program is restarting causing a power surge on warmed up household cables?