Well, 10A is about what is bandied about, though I'd likely use a 7 or 8 amp breaker in a KW for the reasons I mentioned. The KW is rated at 190 watts, but that's input watts, not output watts. In reality, getting about 140 watts out of the KW is about all you can expect. So, that's about 8 amps at 18 volts. Obviously, short circuit current is considerably higher, which is what they're counting on to trip the breaker. Another point is the rollers and the sliding contacts where the throttle shaft connects to the transformer wiring may have high resistance and start heating up with high current. I used to rebuild transformers for a spell, and I'd use Deoxit-D5 on the throttle components to minimize the voltage drop, I've seen them dropping over a volt with a 8 amp load, that's 8 watts being dissipated in the junction. That will get HOT and indeed smoke before the breaker trips in that case.
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