The answer to 'why is my circuit breaker buzzing noise' is that a buzzing circuit breaker is usually a sign of an electrical problem. The buzzing noise typically indicates that there is an issue with the circuit breaker itself, or with the electrical load it is trying to manage. This could be caused by a variety of factors, such as an overloaded circuit, a short circuit, or a problem with the circuit breaker's internal components.
If you hear a buzzing noise coming from your circuit breaker, it's important to address the issue as soon as possible to prevent further damage or potential fire hazards. In many cases, the solution may be as simple as resetting the circuit breaker or redistributing the electrical load on the circuit. However, if the buzzing persists or the circuit breaker continues to trip, it's best to call a licensed electrician to diagnose and resolve the issue.