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Reply to "Airpax Snapac "Instant" Hydraulic-Magnetic Circuit Breaker"

@31charlie posted:

Hi SteveH, So your saying to put a breaker on every feed from source to the load?  Even for accessories?  I must admit that I didn't really think of this before, I was only thing about a train derailing or some thing like that.

I'm not saying you should.  Rather, that I would since there is a chance that a misaligned pick-up shoe or roller could catch the accessory power from one of the auxiliary rails on an operating track.  If that happened, the only thing to cut the power would be the transformer's internal breaker. The PW ZW and KW are slow to trip, and take long enough to melt the insulation on small wires in modern locos and accessories.  I'm not sure about the speed of the MRC's breaker.

In other words, adding additional breakers (one per connected output) is cheap insurance if you're already planning to buy/install one breaker anyway.

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