In order for an EVSE to supply 48A (11KW) the circuit breaker must be 60A and it must be hardwired. The breaker and any connector must only be used at 80% of the rating. For plug in (i.e. NEMA 14-50) the maximum current is 40A (9KW), and the breaker needs to be 50A.
My Charge Point Home EVSE supports 48A, but I set it to limit to 40A, because I am using a connector and a 50A breaker. My Bolt only draws 32A, but when I get my Rivian, it will draw 40A, even though it is capable of 48A. The actual current is the lower of what the vehicle will take or what the EVSE will provide.