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Breaker sizing?

I don't understand the breaker sizing. Manual says 100a for the MSB 60a model. Can someone please clarify why? Wouldn't you fry the unit before that breaker would trip?

Yea,

Dual 10awg should be able to handle 60 amp easy. and I use 70 amp DC breakers to the battery bank

PV side in I use 20 amp 250VDC breakers for the input but this will depend upon your system requirements.

The controller itself is more or less a breaker. if you over power it, it will break. So size the breaker to the size of the wire you use.