WVT-12(M)Permanent magnet solid-closure indoor high-voltage vacuum circuit breaker is based on high reliability,long life,easy to control the design concept,the optimized design on the basis of the introduction of foreign technology,independent research and development of the domestic leading level of a new generation of products.The circuit breaker using permanent magnetic operating mechanism has small volume, light weight,simple structure,reliable operation,maintenance free,long life and other significant advantages.