Reply to "Post war ZW transformer circuit breaker pops after 5 - 10 minutes of running 3 trains simultaneously; what's up?"

ADCX RobOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

wild mary posted:
All the current drawn from posts A, B, C, & D first passes through the ZW's circuit breaker...

You would think so, right? But, that's not what really happens.

The single breaker in a ZW is on the one wire feeding the "U" bus, to which all 4 "U" terminals are sweged to.

This is why it's so very important to avoid connecting the outputs of a ZW to each other when at all possible. Two handles set at different voltages have the potential to cause a 20+ amp fault current between them, with absolutely no overload protection.

2/18/178:48 PM

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