The main switch of XGN34-12Q new-type switch cabinet adopts the most advanced vacuum breaker of permanent magnetism mechanism made in Ukraine or that of spring mechanism at home. The product meets the demand of safe and environmental requirements and also conforms to the trend of medium-voltage switch in the world. The switch cabinet reserves the advantages of fixed box-type cabinet and, due to the application of high-performance maintenance-free permanent magnetism vacuum breaker or spring mechanism vacuum breaker, has compact structure, small size and flexible extension. Besides that, the product adopts sensing technique and latest protective relay so that its performance has reached a high level. Therefore, the product is applicable to power utilization of urban community, small-scale secondary station and box-type station in particular, which have been used widely in such places as residential community, industrial and mining establishment, shopping mall, airport, underground railway, hospital and railway etc.