An online volts to
watts calculator confirms that 500 volts at 300 amps (DC) is 150 kW, whereas, for example, 500 volts at 500 amps (DC) is 250 kW.
So, this is intriguing.
Are there true, substantive (internal) differences between the South Korean (PN 1656565-10-A) and North American (PN 1656565-00-A) Tesla CCS1 adapters?
Or, are they basically the same product, but in the years since the original Korean introduction additional testing has adequately demonstrated (to Tesla and/or NA regulators) that the the adapter can (and has always been able to) safely handle higher power levels in Canada and the U.S.? Or perhaps Korean electrical reporting requirements are more stringent and electrical ratings have to be more conservatively reported there? Or something about the North American electrical grids differs from that in Korea, necessitating the different ratings? (Just speculating, here.)