Sorry for the late reply to this, but just a small warning: If the fan stops due to ingress of foreign objects, a seized bearing, etc. or doesn't start due to a bad capacitor, it will still draw power (even more than when running). If it's thermally protected, it will stop drawing power after several minutes, and then do so intermittently, if it's impedance protected, it will keep drawing power indefinitely. Even in the first case, it's probably enough time for things to go wrong if the fire safety would hinge on that contactor, which it of course doesn't, given the temperature sensor, and probably internal protection in the miner, but still worth to keep in mind.