ZYKCQ-50 high voltage duplicate supply interconversion device (hereafter referred to as device) consists of high voltage vacuum breaker and intelligent controller, it is mainly used for power supply system, which has two ways of power, with AC 50HZ,12KV rated voltage and 630A maximum rated current. When one of them is cut off or under-voltage, it will transfer to the other one for ensuring the uninterrupted power supply. At the same time, by the interlocking function for short and overcurrent protection, avoid unnecessary power impact effectively. When the normal power breaks down, the switch device can complete the automatic switching function, specially for the place not allowed to be powerdown. The product has many advantages, such as modern design, good performance, safe and reliable, high degree automatization and wide application and so on. With the perfect and reliable machine and electric interlock, the product can ensure the completed separation for the two ways high voltage power. And applicable to the double power user who has a high requirement of reliability and safety and act as the control and protection device for power supply system. The product is widely used for 10Kv distribution line of oil field, mine, metallurgy, chemical industry, railway, communication and so on.