The 8 kA/3.6 kV Solid-State Circuit Breaker (SSCB) is a high-performance power protection core device tailor-made for the excitation and quench protection of superconducting coils in fusion devices. Utilizing semiconductor devices and precise control technology, it is configured for high parameters of 3.6 kV rated voltage and 8 kA rated current, meeting the operational requirements of fusion device superconducting coils under extreme conditions such as ultra-low temperature, strong magnetic fields, and high energy storage. It ensures stable and continuous current conduction during excitation and achieves high-speed, reliable breaking within microseconds (≤10 μs) upon quench failure, providing safe, reliable, and ultra-fast electrical protection for fusion devices.