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The 45e is limited to 16A maximum current, regardless of the applied voltage and will draw a maximum of 3700W. To get that max, you need something like 232vac and that 16A (power=volts*amps and can't exceed 3700W - think of the vehicle like it's a smart 3700W light bulb, but limited to 16A).
So, if you had a 16A 120vac EVSE, you could only get to about half of its maximum charging rate. You'd need a 20A 120vac receptacle to get that 16A, though, and those aren't as common in a residence. So, for the US, they supply a unit that will plug into any 120vac socket in the home, whether it's a 15 or 20A one. Because of the length of time it is likely to be on, the US electrical code requires you to derate the line to 80%, which on a typical home, would be 12A, but to provide a little margin for say, you turning on a light in the garage on the same circuit, the unit provided only supplies 10A max.
In the US, 240vac devices tend to be on a dedicated circuit, so you can make them whatever size you want.
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