Whenever a thread on here pops up about circuit breakers, there's always discussion about how much faster the electronic breakers are than thermal ones and one of the revered breakers always mentioned is the breaker in the PH-1 bricks. A handful of us diehards mention the Postwar #91s and how fast they are and it seems that it either gets blown off or just not recognized. I've used the 91s on my layout for 2 years now and also have them on my roller test tracks.
Anyway, a friend came over today for me to take a look at his ZW-C transformer. He thought that there was a problem with one of the throttles and that it was tripping for "no reason". To me, it sounded like a track issue, but he swore it wasn't and "verified" it by connecting that block to his other transformer ( a PW ZW) and the breakers didn't trip. I connected his C to my roller track and mounted an engine on the rollers and ......it ran. All outputs......no trips. So......it was a track issue. Must be a small short that trips the PH-1s but not the PW ZW breaker.
But here's the cool thing. EVERY time I intentionally (or unintentionally) caused a short on the test track, the breaker that tripped was.......the 91! We tested both bricks against it and the 91 tripped before them every time. To me, those 91s are one of the best bargains in O gauge trains.
Roger
