The GY-3S-40.5 series outdoor high-voltage vacuum permanent magnet circuit breaker is a new generation of pole-mounted vacuum circuit breaker independently developed by our compa ny,integrating advanced domestic and international technologies. It adopts a new design concept, incorporates various advantages, and employs high-tech methods. This product can serve as a switch for the main transformer output in 35kV substations or as a polemounted switch in distribution networks. When combined with the company's controllers , it facilitates control , protection ,measurement, and communication, making it the preferred equipment for achieving distribution network automation and smallsized substations.