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

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Drummer3 posted:
Hey Phillyreading, thanks for the info. Found this in my research of AC vs DC breakers:

Sorry, while this is technically true for reasons that don't really apply to your situation, it's mostly bullcrap. The grain of truth in this clip is that a DC breaker will typically be rated lower than it's AC rating for the reason they stated, AC across the contacts is self-quenching at the zero crossing. However, for thermal breakers, there's zero reason not to use an automotive DC breaker in your transformer. Current is current as far as the thermal breaker is concerned, and 10 amps of RMS AC is the same as 10 amps of DC in terms of trip time.

2/17/179:33 PM

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