The answer to 'why is my surge protector tripping breaker' is that a surge protector can trip the circuit breaker if it is overloaded or malfunctioning. Surge protectors have built-in circuit breakers to prevent damage to your electronics, and these can trip if the surge protector is plugged into an outlet that is already overloaded or if the surge protector itself has failed.
Common causes include plugging too many high-wattage devices into the surge protector, a faulty surge protector, or a problem with the electrical wiring in your home. If the surge protector keeps tripping the breaker, you should unplug it and try resetting the breaker. If the problem persists, you may need to replace the surge protector or have an electrician inspect your home's electrical system.