RJR posted:Probably quicker than thermals but slower that electronics.
Remember that when there is a short on the tracks, that does not increase current flowing through the loco's electronics. What is damaging is any sparks created by the derailment, the risk from which cannot belessened by a breaker but needs a TVS.
I've had direct shorts of an engine on the track cook the wiring before the thermal breaker disconnected. This latest one was a short of the common wire from front to rear trucks thru the tender. A fast breaker helps from wires getting heated up too. Actually that issue takes a lot more repair time than replacing a board. Although the board costs more, I realize.
