Good point! My PSX-1AC's are set for 8 amps which probably explains why they trip before the PH135's. Interesting that I don't get a nasty spark/arc with the PSX-1AC like I do with just the PH135. Perhaps the PSX-1AC opening at lower amperage is the reason for no spark/arc? I have tested the DCS signal on my layout and without the PSX-1AC (between track and TIU) and I can't determine a difference.
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