I can only speak for the Legacy Powermasters that I'm running and they do indeed have a fast acting internal circuit breaker. This would not eliminate the need to place some kind of circuit protection after the PW Transformer in my opinion. I have 10 amp fuses between the transformer and the Powermasters and anything that happens on the track trips the Powermaster. The Powermasters seem to trip very quickly when there is an issue!
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