This series of outdoor high-voltage vacuum circuit breakers has the advantages of safe and reliable performance, easy maintenance and long maintenance cycle. Due to the use of new insulating materials filled. The outer side of the arc extinguishing and the inner wall of the porcelain pipe are free of condensation, and the transformer is placed in the overall structure of the mechanism box or outside the box, which is convenient for installation. And it also avoids oil, gas leakage and toxicity problems with other switches. Because the dynamic and static contacts of the circuit breaker are sealed in the vacuum interrupting chamber, and the vacuum is used as the insulating medium and the arc extinguishing medium, so it has a series of advantages that other types of switches cannot match, so this product is an ideal product to replace the DW multi-oil circuit breaker, the mechanism of the operating mechanism box of this product in the middle of the circuit breaker is a mid-mounted high-voltage vacuum circuit breaker, and the overall length of the circuit breaker is reduced by 260mm compared with the original circuit breaker, which is suitable for installation in places with less space location. The product is suitable for 40.5KV, 50HZ three-phase power distribution system, as a load distribution current, overload current and short circuit current. 1. It can also be used in the circuit of high-voltage SVG enabling power station as the main incoming switch. 2. The phase spacing is 710mm below 2000 meters above sea level. 3. It can be installed at an altitude of more than 4500 meters, and the dimensions can be customized.