The ZW7-40.5 series outdoor vacuum circuit breaker is a three-phase AC 50Hz, rated voltage 40.5kV outdoor high-voltage equipment. Can be used for breaking and closing load currents, overload currents, and short-circuit currents. This product has a reasonable structure and is easy to maintain. It can be equipped with current transformers to achieve multiple changes and windings, meeting various needs in metering, measurement, and protection.