When I opened up my HP PDU I saw a 50A breaker for main rocker switch and 4 x 15A for each switched plug on the PDU.
Why is PDU rated for 30A? It seems like a 50A breaker inside PDU would not protect a 10 gauge wire with 30A breaker at the panel?
What am I missing?

My PDU is this one but I assume all 30A PDU have 50A breaker inside or am I wrong?
https://www.amazon.com/HP-EO4501-MODULAR-CONTROL-UNIT/dp/B014S24VAU