@bmoran4 posted:There can be perfectly acceptable scenarios that lend themself to having a ZW with four 10A breakers hanging off of it and there are others where that would be inappropriate. That is why I always recommend, with the goal of protecting the downstream equipment, one sizes the instant breakers to the downstream load and never let the total load exceed the transformers capabilities (sure a 20% de-rating parameter can be utilized in determining the capabilities).
I understand that with accessory loads the breaker should be sized for the intended load. I'm wanting to understand your statement about other inappropriate scenarios. Where it applies to protecting the train's electronics (with judicious use of TVS diodes), can you provide some examples of when using a 10A instant breaker might not be appropriate?
