@nkptomo posted:I am have an old TIU with no internal fuses. A Z1000 transformer,a 15amp circuit breaker from Scotts-Odds-n-Ends.I have not used DCS for 18 years, forgot alot. I bought a home 22 years ago with a big basement for my Trains. Finally starting my dream layout .Taking out my MTH emgines and all batterys are dead except for a 765 Proto 1 I did a upgrade on.Made a big loop in my living room, hardwood central. trying to remember how to run DCS. Loving Retirement.
Given this scenario, I would run that TIU in passive mode. 
Henning's happens to sell the exact 5A thermal self reset breaker I tend to use.
https://hennings-trains.shopli...circuit-breaker.html
Another member @zhubl makes a custom board with choke and other features just for this purpose sold under item number 385356672902
Otherwise, the DIY choke https://www.digikey.com/en/pro...P1770TA-220M/5429725
This post is also great with a huge information resource of common parts for power and filtering from Digikey and other electronics related to these topics https://ogrforum.ogaugerr.com/...3#151914096433446323
