Reply to "circuit breaker location"

Vernon BarryOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

@SteveH posted:
The consensus here on the forum is to locate breakers between the TIU Outputs and the track connections.

NO, sorry, that is incorrect.

Breakers and fuses should be nearest the power source- the transformer BEFORE the TIU.

PSX-AC specifically before the TIU not after because it could interfere with DCS signal.

Another reason is, the TIU itself is an electronic "load" and has TVS devices on each output that can fail shorted. And while the TIU has internal fuses on each channel, they are large 20A rating, so when/if a TVS is damaged and fails shorted- you don't want the TIU taking that brunt of the current until the 20A fuse blows.

Drawing originally by @CAPPilot but some details edited by me for fuses or breaker placement.

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