ZW8-12F(G) intelligent outdoor high-voltage vacuum circuit breaker (hereinafter referred to as intelligent circuit breaker) is used for three-phase power system with AC 50Hz and voltage 10-12kV. It is used to disconnect and close load current. It has overload and short-circuit protection functions, quick-break protection function, time-limited delay protection function, automatic reclosing function, and can also be equipped with lightning arrester or disconnector (i.e. circuit breaker and disconnector combination, hereinafter referred to as "combined intelligent circuit breaker") according to user needs. The intelligent circuit breaker has its own power supply and can be remotely controlled nearby. It is equipped with CT and PT interfaces to meet telemetry requirements.