Well, I absolutely agree with the recommendations to ideally use a 7 or so amp breaker in the kw. However , the 10 amp automotive type is what is typically been sold for the kw over the years. The one I have is one I acquired 10 or 15 years ago from a parts vender and is still sold by venders for the kw(15 for the zw). I installed the 10 amp yesterday before this thread. This evening after work I hooked on the layout and shorted the track with a car(no delicate electronics to fry). I measured a 20 amp fault current with ammeter (adjusted with voltage)and the breaker opened in a very short period less than 15 seconds. This is well within the original specification of 15 to 45 seconds noted on the chart for the Lionel 5 f test set for the kw with 20 amp current flow. So I probably will not burn up my transformer with a short but I think I will use resettable magnetic circuit breakers of 7 or so amp between transformer and track Along with TVs. Also some of the less than 10 amp auto reset breakers are kinda hard to find.
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