How to test my digital key 10 amp circuit breaker a122b1-10

Maybe the exact circuit breaker you're testing would help us here.

If it's the W51-A122B1-10, those are pretty slow thermal breakers, you'd be far better off with something like the Airpax Instant Trip breakers.

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.

@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.

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

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.

Circuit breakers are not the place to save $5, go for the best.

@John Meyncke posted:

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.

Thank you very much guys and girls. Can you please tell me the part number and exactly where to order the airpax 10 Amp breakers. Jerry

The thread GRJ linked above "Airpax instant trip" should give you all the information you need.  FWIW, I bought the 7.5amp version which works instantly.  

Can the circuit breaker be located around 8 ft from the Transformer and still be effective? Thanks, Jerry

Sure, it can be anywhere in the circuit, the current has to flow through the entire circuit.

Thank you very much for the information. Well appreciated, Jerry