The answer to 'why is my circuit breaker sparking' is that a sparking circuit breaker is usually a sign of an electrical problem that requires immediate attention. Sparking can be caused by a variety of issues, such as a short circuit, overloaded circuit, faulty wiring, or a problem with the breaker itself.
If your circuit breaker is sparking, it's important to turn off the power to that circuit immediately and call a licensed electrician. Attempting to troubleshoot or fix a sparking breaker yourself can be dangerous and may lead to further damage or even a fire. A professional electrician will be able to diagnose the root cause of the problem and make the necessary repairs to ensure your electrical system is safe and functioning properly.