How to Tell if a Breaker is Bad

How to Tell if a Breaker is Bad
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There will undoubtedly come a time in your electrical career where you will need to troubleshoot a bad breaker. How do you go about diagnosing whether or not a breaker is bad?

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Over the course of a circuit-breaker’s life it can become damaged. It is a simple mechanical object that always has a certain level of heat it’s experiencing, when current is flowing through it. So excessive heat can cause the components inside to weaken over time. Moisture and extreme fluctuations in temperature can also cause breakers to fail over time.

For non-general-use breakers such as smart-breakers, AFCI, GFCI, Dual Function, and shunt-trip breakers, they may have additional internal computer boards and components that can fail too. Many times these utilize more intricate/weaker secondary components that fail more often than the primary components of the breaker.

There are several ways to diagnose a bad breaker, including a simple visual inspection of the handle, the terminal, and the back side of the breaker where it attaches to the panel’s busbar. Often times you’ll see signs of melted plastic where excess heating occurs, and it’s usually where there’s a termination or a point where two things are making contact. Other things to watch out for are a breaker not tripping when it is intentionally short circuited. Lastly, if there are no physical signs of damage to the breaker, you can test the internal circuitry of the breaker by testing the terminals with a multimeter. The breaker should have voltage from the output terminal to ground and/or neutral. If it is a 2-pole or 3-pole breaker there should be voltage between each of the terminals of the breaker – typically around 208-240volts from terminal to terminal.

#breakers #circuitbreaker #shortcircuit

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40 Comments

  1. I shorted an outlet but its circuit breaker didn't trip. Upon checking the circuit breaker I noticed that there are 2 wires tapped on it could it be the cause?

  2. Yeah but what if electrician comes in brand new young guy and says oh well we can't replace Breakers anymore the whole thing has to be changed I mean house is not 100 years old

  3. We live in a house built in the 60s and if a breaker trips it takes a good 12 to 24 hours before it works again after it trips. Is this normal?

  4. I just spent a week troubleshooting my GFCI circuit. The GFCI outlet was tripping and the breaker was tripping. I replaced the outside 23 year old outlet with a WR outlet. (It wasn't before) The circuit would work for a few hours than mysteriously trip again. I then replaced the GFCI outlet thinking it was bad from tripping so many times over the years. That improved it a little but the breaker was still tripping as well as the GFCI. Well I never opened up a panel and I was hesitant to replace the breaker but after doing a lot of online research and watching a lot of Electrician U videos I decided I could do this myself and save.

    I have a CH panel so I needed to get an Eaton CH 15 amp breaker at Home Depot. It was easy to replace the breaker as long as you follow proper safety procedures. I did all the testing that he suggested and nothing stood out. Voltage ok, resistance ok, no physical or thermal damage was evident. Popped in the new breaker and tested it fully along with the GFCI and it is holding fine after 24 hours.

    Morale of the story, breakers do go bad. Who'd thought. This is the first time in my 60 years of living on this earth I have ever needed to replace a bad breaker. I guess the fact that it was on a troubled GFCI branch circuit that has been a pain in the ass over the years kind of helped it to go bad in a way that was not obvious. No shorts, no overloads, it just tripped because I guess it was just getting tired.

    Thanks Electrician U for helping me to figure this out and saving me money as well.

  5. Alot of times I have found that if a wire is burnt its not a bad breaker sometimes its a loose connection. Which I have been in electrical work over 45 years

  6. what if you cap the wires of the suspect breaker find a spare or known working one and put those wires in that one after power is off. if it trips its not a bad breaker.

  7. Had a 15 amp breaker failure on me yesterday. Within 2 seconds the entire panel was engulfed in flames. I hit the main just in time.

  8. 😂 39 seconds into your video and I'm rolling. I'm going into my 4th month of working for myself and after doing everything but carpet for the last 20 years and I'm learning alot about electrical from your channel. Keep up the good work man.
    One of the most rewarding things I've done, next to watching my daughters grow, was teaching (like, they were actually listening and not on their phones) two guys everything I could think to teach them in the time I had. In the beginning, one guy went from handing me a caulking gun when I asked for a torpedo level to doing level 5 smooth finish drywall. The fact that I turned him loose with his capabilities is such a cool feeling and I did that for him and another higher skilled laborer, but you guys are doing it for thousands! My hats off to you brother! Keep it wierd. Lmao. 😂

  9. Great vids, Im a diy guy I have installed plenty of fixtures, outlets and switches in my life no expert with that said I have an older friend that lost her husband 4yrs ago(great guy)and recently one of her indoor lights started to flicker and finally stopped working so we wanted a different fixture which she bought I installed it and now the light works than after an hour would not turn on decided to change the breaker since the other light would flicker and we got the same result worked than after an hour it stopped working, any ideas
    Thanks for any info you may give

  10. What’s really fun is buying a brand new home. Just built. And having the circuit breakers constantly flipping for no reason. Half flip off during power outages. Every. Single. Time.

  11. Outlets in spare rooms hadnt worked. Decided to finally fix. Turned off the outlet and decided to see if the breaker was backwards. There is now power in the outlets. Bad breaker or installed the opposite way?

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