Join the discussion on the following article:
Circuit-breaker protection
If you’re running multi train loops it might be better to put the fuse or circuit breaker on the center rail feed. On most transformers, the ground is common or all grounds tied together.
This can be checked with an ohm meter. Check the resistance between the outer rail of one track (circuit) and the outer rail of another. If it shows a dead short, the gropunds are all common in your transformer, and a fuse in the ground won’t protect the circuit or the train.
J. Vobbe
retired radio engineer
I am using a classic ZW as my main power source, and wired a 10-amp automotive fuse into the third-rail feed as a circuit breaker. The problem became one of cost: the fuses, which blew instantly at the slightest derailment, cost nearly $1 each to replace. Even when I was standing right by the transformer I could not cut the power quickly enough to save the fuse. After a while, I removed the protection and take my chances. My home layout is 10 x 15’, single track main line, with a 4 track yard.
I have 3 cw-80’s & 2 type r 110 watt transformers ,so far i havent had any problems with the older one’s & i run conventional & command control, i will take my chances & not add any circuit breakers.