BGZ8A-12F outdoor intelligent high-voltage vacuum circuit breaker (hereinafter referred to as intelligent circuit breaker) is an intelligent control and protection device in 10KV and 50HZ distribution circuit. It integrates protection, control and integration, with its own protection module, which can independently complete the protection functions of over-current protection, short-circuit protection, single-phase grounding zero-sequence protection, three-phase unbalanced zero-sequence protection, current velocity cut-off protection, timed over-current protection, fault cut-off protection, data recording, automatic call reclosing and so on. Also can realize ring network power supply special use requirement to realize bilateral atresia, unilateral pressure switch, bilateral subsection brake and other intelligent distribution network power supply function, equipped with Ethernet interface, mobile communications, communications and operating functions such as remote control, intelligent network control can be realized with intelligent systems to the construction of intelligent power grid is preferred