I am with Gunrunner John on a smaller circuit breaker. I used 6 amp CB on my layout seen below.
"Reset" is for 6 amp circuit breaker (CB) for inside loop LW transformer (the reset button is part of the 6 amp circuit breaker mounted under the panel 1/8 in Masonite panel)
"Short" is a 12-18 volt light wired across CB to light when tripped, the red Reset button is the actual CB reset button as the CB mounted is below the control panel.
I have a 14volt, 40 watt transformers for my switches. Many switches are wired to active in pairs and I use another 6 amp circuit breaker for that transformer too. I find the track transformers CB's trip quite often with derailments and switch transformer CB rarely trips but it does trip some.
You might want to try eBay for a better selection of circuit breakers than Amazon.
Charlie