EATON ELECTRICAL would hereby recommend a kind of medium voltage product superior to IEC and GB standards with the features of high reliability and long life. YWL-12 Permanent Magnetic Indoor Vacuum Circuit Breaker developed by EATON ELECTRICAL as a leader in vacuum technology of the world with the latest technology topped the world on its reliability, life, security and functions. YWL-12 Permanent Magnetic Indoor Vacuum Circuit breaker is processed and assembled in the factory with ISO9001 certificate appointed by EATON ELECTRICAL. As the new member of EATON ELECTRICAL vacuum circuit breakers, it also has the excellent design and quality as the previous products. This type of product is the instrument with single phase 50 Hz single-pole indoor model, and the rated voltage is 12kV. It is used as the control breaker and failure protection special breaker for energy receipt and distribution of power supply system of railway power traction in the field of power supply and distribution system of substation, switch station and sub-switch post of electrified railway traction, especially for important load and frequent operating condition. This type of product could not only be installed in grid interval with bottom frame, but also in XYN21_31.5 type switchgear.