You could use this type with these fuses.  But I don't have a TIU so that part of it I am not sure of.

If you are not in a rush I have a bunch of extra fuse holders like that I don't need.  Just contact me using my profile and give me your address.

John

@BradFish1 posted:

I just got my TIU repaired and the repairman recommended putting ATC fuse holders in-line with the red wire between my TIU and the track. Just wondering what others are using and what your experiences have been. The fuses in the TIU didn't blow and protect it and he can't explain why.

NO, put the fuse between your transformer and the TIU INPUT.

Why? The TIU is an electronic device or load. It can have failures- example the TVS failing shorted on a channel. Thus the fuse is there to protect the load.

Original diagram by @CAPPilot and further edited by me.

The internal TIU fuses are 20 amp standard, though some folks change them out to 10 amp. But then if one blows you have to dissassemble the TIU to change it.
Simple inline glass 10 amp fuses is all you need, and they should be easily accessible in a spot that does not require crawling.

Rod

I have 10 amp automotive spade fuses between the transformer and the TIU. I also have amp meters on each loop and pulling 8 cars with incandescent lights and two A units with a total of 4 motors going up the elevated section of my layout, the most it ever pulls is 5 amps.

Suggest searching the forum for threads about circuit breakers and fuses.  After reading one of those threads a few years ago, I purchased some fast-blow breakers and inserted them as @Vernon Barry illustrated above.  At the time, they were just a few dollars each, and could be easily mounted in a control panel or layout fascia.  Unfortunately, I no longer have the item number available.

I use breakers wired as @Vernon Barry shows above.  If you search the big A for "Manual-Reset Low-Profile ATC/ATO Blade-Style Circuit Breaker" you will find them.  I use 5A and 7.5A breakers depending on the train I am running.  Breakers tend to trip slower than fast blow fuses is the reason I use smaller breakers. 

I use the 7.5A breaker when I am running post war stuff with incandescent lighting and pull-more motors.  5A for modern can motors and LED lighting.  If you want 1 size I'd go with the 7.5A.  They don't trip as fast as the Lionel 180 watt bricks but they are pretty fast.  Knock on wood, no failures... yet.

Tony

Our modular club has always used 8 amp AGC fast acting glass fuses out of the TIU to the track.  Years ago circuit breakers were thought to be too slow  to protect both the TIU and the engines.  We sometimes run six or more engines on long trains without exceeding 6 or 7 amps. Blown fuses do happen with dead shorts like major derailments but are rare.   I can't remember the last time we had to change a fuse. Typically the Z4000 will trip off first.  No problems in 15 years of open houses.  By the way we have a couple of open houses coming up in February.

Check us out on facebook:  Anthracite Hi-Railers.

Earl   

@Mallard4468 posted:

Suggest searching the forum for threads about circuit breakers and fuses.  After reading one of those threads a few years ago, I purchased some fast-blow breakers and inserted them as @Vernon Barry illustrated above.  At the time, they were just a few dollars each, and could be easily mounted in a control panel or layout fascia.  Unfortunately, I no longer have the item number available.

Are you maybe thinking of the Airpax Instant breakers?  Here is a link to more info on these including where to buy them:

https://ogrforum.com/...-internal-mechanisms

Here are my fuse holders mounted between my transformers and main power distribution to the track.

My TIU is connected passively.  I prefer this to sending power through the TIU.

These fuses block, are available Grainger Supply.  Uses standard glass fuses available at most auto parts stores. Right of grey wire tray.

Another look at the fuse assemblies, upper left. 

If you don’t get many derailments/shorts on your layout, a simple automotive blade type quick blow fuse will work.  You can pick up fuses and holders at any auto parts store and probably your local big box store.  If derailments/shorts are not uncommon on your layout, you will soon grow tired of changing fuses.  As previously mentioned, install your circuit protection between the power and the TIU.

I use the automotive type fuses (10 amp for the tracks and lower ratings for accessories).  I also use magnetic hydraulic quick acting breakers for the tracks (belt and suspenders).  I use are Eaton FAZ-B (3 to 5 amp) breakers.  They almost always beat the fuses.  The Airpax breakers in the thread that SteveH linked are also a good choice.

Though some folks use thermal breakers, I would avoid them as they are slower than magnetic hydraulic breakers.  Also make sure you get breakers with the quickest curve.  My first breakers were Airpax, but I didn’t get a quick enough model and the fuses always beat them.

SteveH already posted the link but here is the link for the ones I bought. 5A Airpax. Placed between the Transformer and TIU. They sometimes trip before the Transformer internal breakers. Work great.

https://www.onlinecomponents.c...00aobv-10090638.html

@BradFish1 posted:

I just got my TIU repaired and the repairman recommended putting ATC fuse holders in-line with the red wire between my TIU and the track. Just wondering what others are using and what your experiences have been. The fuses in the TIU didn't blow and protect it and he can't explain why.

Try these

Great info !!!

I am building a modular RR in my basement.  

I plan to use MTH Z4000 Remote Commander In conventional mode.  

Where should the fuses &/or circuit breakers be installed ?

Between transformer power out & the track ?

Between track ground & transformer ground ?

Both places ?

Somewhere else ?

Thanks in advance!!!

CB&Q Bill

@CBQ_Bill posted:

Great info !!!

I am building a modular RR in my basement.  

I plan to use MTH Z4000 Remote Commander In conventional mode.  

Where should the fuses &/or circuit breakers be installed ?

CB&Q Bill

Install circuit protection right after your power supply before it goes anywhere else such as the TUI (if you run DCS) or the track.  Out it on the hot side, not common/ground.