MTH DCS fuses and amp limit question

There are four fuses in the TIU, one on each channel.  They are 20A 32VDC BLADE MICRO FUSES.

If you want better protection, consider a 15A fast blowing fuse off the transformer.

@gunrunnerjohn posted:

There are four fuses in the TIU, one on each channel.  They are 20A 32VDC BLADE MICRO FUSES.

If you want better protection, consider a 15A fast blowing fuse off the transformer.

So each of the 4 channels of the DCS can actually have up to 20 amps of power? Why did I think the magic number was 10 amps?

Does the version of the TIU matter?

It is ten amps, the fuses are only there for gross overloads!

I have four 10 amp auto blade fuses in holders that are sold at Walmart and the like. One is on each TIU channel's input. I have four Lionel PH180 bricks for power and alternate in a MTH Z4000 when I want. Even when the bricks are there with their fast acting breakers, I still like the inline fuses at the TIU.

I've never had any TIU failures and I have blown many fuses from derails. Most blown fuses were on my outside G scale DC layout. Again, I have a ten amp fuse on each fixed input with DC power from Bridgewerks high power packs.

So it's cheap and fast to swap out a blown 10 amp auto blade fuse. Don't push the internal fuses!

When the G scale trains pick a switch, they'll pop the fuse before you even know you had a derail. The 25 amp pack would fry something otherwise I believe.

if you want or need more than ten amps a channel, look up passive TIU wiring. Takes the TIU 10 amp limit out of the equation.