Testing circuit breakers?

kernel_kate

I have a panel of type XO circuit breakers in my house. One of them has failed closed (!) and I need to replace it. However, a few minutes on Google seems to indicate that this type of breaker is no longer produced. A few sites sell refurbished ones, but other forums mention that this is also problematic. If I buy a refurbished breaker, how do I test it to make sure it is good?

Originally asked by tomwhipple on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

While I'm sure the cost seems prohibitive, it might be time to start thinking about changing out the panel. If the breakers are known to fail closed, you could end up watching your home burn to the ground (hopefully from the outside).

Full answer by Tester101: https://diy.stackexchange.com/a/48374 (CC BY-SA 4.0).

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