During the 1990s I was still using 3 pw ZWs [each on separate tracks] all of which at one time or another when loaded at 8-9 amps on my high shelf railroad, tripped out after about 20 minutes of continuous running. Based on my AC Ammeters,wired indivually on each power district[track], when converted to watts, it indicated 180-190 watts was about maximum load for my well maintained ZWs when running continuously. Typically I ran two trains on the same track, usually one was a long lighted unit of 10-11 cars.
Eventually changed over to 180 watt PoHos , TMCC and changed to LEDs in lighted passenger cars--no further problem with tripping. Just as info,180 PoHos [bricks]have the fastest reacting circuit breaker of any transformer I have ever used.
