The answer to 'why is my circuit breaker sparking' is that a sparking circuit breaker is usually a sign of an electrical issue that requires immediate attention. This can be caused by a short circuit, overload, or other problem in the electrical system.
Some common causes of a sparking circuit breaker include faulty wiring, a failing appliance or device, moisture or water damage, or a problem with the circuit breaker itself. Sparking can also indicate a more serious issue like an electrical fire risk. It's important to address the problem right away to prevent further damage or potential fire hazards.