A little more history/info might help, the motor brand, model number HP rating. How long has this compressor been at it's current location and used on the same wiring? Using a long undersize extension cord? How close are you to running this circuit at the recommended 80% or less rule? Is there any wiring damage, burned plug, cable or socket issues? Is this a dedicated circuit (not shared). Does the compressor turn by hand easily at zero pressure at the tank? Any recent changes like a new belt? or tightening slack recently. 39 startup amps wouldn't really concern me, if that doesn't trip the breaker instantly, running amps under full load would be of interest.
Last edited by stevon; 07-08-2019 at 03:40 PM.