Even though Barry indicates that HE does not use external fuses, I have found on our layout, the minimal investment in automotive "fast blow" 10 Amp fuses on the output of each TIU channel has worked VERY well of us. I blew out one channel of an earlier TIU, and then installed the 10 Amp automotive type fuses, and have blown/popped many a fuse, without any damage to ANYTHING. We have two Z4000s and two Lionel 180 bricks.
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