ZW30-40.5 series outdoor high-voltage true-pressure circuit breaker is a three-phase AC 50Hz high-voltage switchgear, mainly used for the control and protection of 40.5KV transmission and transformation systems, and can also be used for normal operation and short-circuit protection of urban and rural power grids and industrial and mining enterprises, and can be used as a connecting circuit breaker and for opening and closing capacitor banks.