Circuit Breaker Protection for model railroad control systems:
I use 3 ampere types for protection of individual power feeds to track blocks since my layout is small.
The photo shows a Carling Technologies CTB-B-B-03 3 amp circuit breaker that is used on my system.
Also shown is the 10 channel circuit breaker box that feeds the track voltage on my layout.
Note: Additional 10 amp circuit breakers are used for the outputs of a Z-4000 transformer. (not shown).