Is it normal for a breaker panel to buzz?

No, it is generally not normal for a residential circuit breaker panel to emit a noticeable buzzing, humming, or crackling noise during standard operation. While a very faint, almost imperceptible 60-Hz magnetic hum from the main utility transformer can sometimes occur, a loud or persistent buzz usually indicates an underlying electrical problem, such as a loose terminal lug screw, an overloaded branch circuit, a failing circuit breaker vibrating under current, or loose wires. You can troubleshoot electrical panel safety safely by avoiding bare internal components and listening near the panel cover. You can verify that your corrective action is successful when having a licensed professional electrician inspect internal terminal connections, torque loose lug screws, and replace any buzzing or defective circuit breakers eliminates the acoustic noise and ensures safe, stable power delivery.