The answer to 'why is my circuit breaker buzzing noise' is that a buzzing sound from a circuit breaker is often a sign of an electrical issue that needs to be addressed. This can be caused by a loose connection, a problem with the breaker itself, or an overloaded circuit.
A buzzing sound indicates that the breaker is not operating properly and could be a fire hazard. It's important to address this issue right away to prevent further damage or risk. In some cases, the solution may be as simple as tightening a loose connection, but in other cases, the breaker may need to be replaced by a professional electrician.