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I am not sure if my subject circuit breakers are working. I run my original ZW Transformer up to around 19 volts and just try putting a screwdriver or an engine across the tracks and the voltage will go down to about two but the circuit breaker won't break. I obviously want to protect my newer electronic engines from failure. Before they seem to work but now I am not sure. Please advise how I can Ensure circuit breakers work or ensure I won't blow up my electronics on my newer engines. Thank you very much, Jerry

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@Junior posted:

Love, Love,  LOVE the Airpax instant trip breakers! They’ve saved my bacon many times; not that I’m a wreckless driver! But accidents do happen.

Yeah they’re a little pricey but so is getting your TIU or engine or both repaired.

The Airpax breakers I mention are only around $12-$13, not exactly a break the bank price.

They went up a bit, Digikey has them for $15, but they're out of stock until late in April.  Mouser has them now for the same price.

Last edited by gunrunnerjohn

I bought and installed the Airpax instant trip breakers (10 amp) based on gunrunnerjohn's recommendation quite awhile ago. They work flawlessly first time, every time! My previously installed breakers purchased from a well known source allowed me time to go make a sandwich and come back before they would trip...



Don't waste your time or money on anything else.  IMHO...

John

Last edited by John Meyncke

With a thermal breaker, you are hoping that the breaker heats and trips before your wiring and electronics heat and burn up.  From experience, I know that 10A current will burn insulation off wires and destroy circuit boards if the breaker trip is not instantaneous.  Consult the Mfg. data sheets to determine the trip times.  That's why I went with instant trip parts.

I have tested a batch of Airpax Snapax instant trip 10A hydraulic breakers with a resistance load (heater coils) and found they trip just above 10.0A.  The least sensitive of the batch tripped below 10.2 amps.  They trip much quicker than the Z4000's breaker which was the cause of my fried boards.

I bought and installed the Airpax instant trip breakers (10 amp) based on gunrunnerjohn's recommendation quite awhile ago. They work flawlessly first time, every time! My previously installed breakers purchased from a well known source allowed me time to go make a sandwich and come back before they would trip...



Don't waste your time or money on anything else.  IMHO...

John

When you got back you could toast your sandwich over the short.

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