The LW34-40.5 series outdoor high-voltage sulfur hexafluoride circuit breaker has good breaking performance and adopts a pressure type arc extinguishing chamber. It has a long electrical life and can continuously break a short-circuit current of 40kA for 21 times at rated voltage without maintenance or replacement of sulfur hexafluoride gas. The mechanism has high reliability and a mechanical life of over 3000 times. It can be operated frequently and can be equipped with 12 current transformers for users to choose from This product adopts the newly opened MKZ SF6 pointer density gauge, and the pressure gauge reading is not affected by temperature changes, making it easy to use