The numbers shown in your original post do not look like measured data. I was guessing these were calculated values instead.
If you can, actually measure the voltage and the current and perhaps the circuit breaker and conductor temperatures. This information will help me determine if this should be a concern or not. Once I know some measured values, I can determine if this condition is typical or if you should be looking for other problems.
So a clamp on ammeter with volt meter and an IR temperature meter would be very useful.
Your description does have me concerned. "All my breakers get warm to hot to the touch" is a description that is abnormal. My first method of diagnosis is to touch things to feel how much heat exists. All my cords and breakers are just barely warm enough to feel any warmth if I really concentrate on it. If I ever feel more than that, I measure, double-check, inspect and test everything.
I'm guessing again the calculated current is based on the specs shown on Bitmain's site which can result in underestimation of current. Which will likely result in an overloaded circuit. If you have over 80% load on the circuit, it is overloaded by definition.
When you measure the current on the three phase breaker, please be sure to measure all the current going through each leg of the breaker. There are 3. Also measure the voltages between a-b, b-c and c-a. Three phase can be tricky. If you have 3 miners connected, one to each phase, the current per leg at the breaker needs to be known to understand the system loading.
Any 30A circuit loaded at only 21A should be very close to ambient temperature. It should be very difficult to feel any warmth on that circuit breaker. The mention you do feel warm to hot means something is not correct.
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