TedW posted:So, to further my education at someone else's expense; my old scout growler derails and the circuit breaker pops. With the TVS at the xfrmr terminals, why doesn't the TVS pop/blow also, or, is it protecting me in another way?
It's not really protecting anything on a Scout. You had a current overload... A TVS isn't for that, it's for over-voltage protection. A TVS can be checked/tested easily with an oscilloscope, and not so easily with a number of Rube Goldberg methods that I would not mention in a public forum due to safety issues.
TedW posted:Further, is it feasible to remove the shell of say a legacy GS4 and put in a tvs somewhere to provide better protection specifically to the electronics?
Yes. Although we're talking about the speed of light and the smallest of distances, the closer the TVS is to the component(s) being protected, the better, especially if it is between the fault and the device. There are diminishing returns though in trying to place one everywhere you might need one.
