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[quote user="gregc"]there would be 0.36 W in a  PowerCab supplying 3A, if similar mosfets are used.    I don't see any openings in the PowerCab for ventilation.   (maybe I should cut some).[/quote] Im pretty sure that if you modify your power cab, operate it over the limit, NCE isnt going to warantee repair the thing.  Ive used mine for hours, as have many others, without exceeding the 2 Amp rated capacity. Or just budget your current draw to 2amps? Why all the fuss over three amps.  The manufacturer states its a 2amp system.  Dont exceed 2 amps and you will find that it will last you a long time.  To answer your question on the circuit breaker, typically they trip at the setpoint you choose.  2.5A = 2.5A.  You can have a short that persists if you dont wire your layout properly.
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