@Norton posted:I don’t see any way the PSX AC can be any faster than a 180 watt brick. This is for AC not DC. AC passes through zero 120 times a second. You can’t sense a short circuit when there is no current. Only as it approaches max voltage can it sense a change in current.
On a DC layout it can respond faster than 8 ms but not AC.Folks using these after a modern transformer, they are really only useful if you want to limit the current on a section to less than ten amps which is what a modern higher power transformer of at least 180 watts trips at.
Want to turn your Post War ZW into a modern transformer? Use a PSX1-AC.
Pete
Thinking about this, I don’e see a 8 ms issue for AC. True if a derailment occurs when there is no current, but then as the current rises and reaches the set current limit of the PSX, then the PSX will trip faster at that moment than a PH180 which has a relay in it. So yes, the PSX can respond faster than 8 ms…but not until it has to.
