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Does a circuit breaker need to be replaced if it will not go back to the on position after it trips and is switched to off?

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Not necessarily, you may have a genuine fault on the circuit that needs attention...
First thing to do is unplug and disconnect everything on that circuit and try again. If it then resets properly, one of the items you've disconnected is faulty.
With the trip reset (power on), plug in each item one by one and see if it trips again. Whatever you are plugging in when it trips is more than likely the faulty item.
The likely suspects are usually Washing Machines, Dish Washers, Kettles, cookers and Microwaves.
It could be fault, but better to be safe than sorry and check the circuit first.
If not entire sure what you are doing, get a qualified electrician to look at it.
If the trip does need replacing get a qualified electrician to do it!
Thanks for the feedback!

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