Could be a weak capacitor or the centrifugal switch contacts are arced, not always making good connection.
Could be an intermittent short to ground in the motor, pressure switch, or wiring. Compressors shake around a lot, can wear through the insulation.
And can also be a mechanical problem with the compressor itself, unloader not always unloading, leaking valves or carboned valves letting pressure bleed back to the low pressure cylinder.
Running them on 30a breakers is pushing the limit for a heavy motor starting load, which compressors are. Now that they are on 40a breakers there should be no problem as long as everything else is good, mechanical and electrical. And yes, breakers do have a time delay lag to prevent false tripping. It is normal for motors to draw huge amounts of amps during start up. They are drawing much more than your meter is reading, the meter is just not quick enough to catch it. The reason this is acceptable is it happens so quickly, nothing has time to heat up enough to cause damage.
That the motors are running right at the motor full load amp rating is a good sign. That means the motors are matched to the compressor and the compressors are working as they should.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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