Note to Alex:
I have purchased a number of 5 ampere circuit breakers that I use for all my circuit power. I insert 1 breaker between my KW ouitput (I have 4 units)) and my TIU (I have 2). I also insert another circuit breaker between each TIU output and the wiring to the track. I also have a circuit breaker and fuses for power to all my MTH RealTrax tunouts since the turnouts are powered separately (not using track voltage).