Dual power automatic transfer switch ATSE ATSC development process that dual power automatic transfer switch, a switch from appliances and other electrical components required, as the end of the fire load and other important load of each switch device, ATSE important load in the power supply system is an indispensable and important part. ATSE present in our country has gone through four stages of development, namely two contact-type, two breaker type, field type dedicated electric switch and special switch. Two contact-type switch for the first generation, is China's first production of dual power switch, which is composed of two overlapping contacts made simple power supply, this device is not reliable due to mechanical interlocking, large power consumption, etc. disadvantage, thus using less and less in the project. Two circuit breaker type switch for the second generation, which is the national standard and IEC standards mentioned in our CB-class ATSE, which is formed by the transformation of two circuit breakers, comes with a mechanical interlock device may have a short circuit or over current protection dual power, but unreliable mechanical interlock. Excitation type-specific conversion switch to the third generation, an integral unit which is excited by external controllers constitute contactors, mechanical interlock and reliable conversion attractive to be driven by a solenoid switch, fast. Electric dedicated switch for the fourth generation of PC-class ATSE Siemens dual power, which is in line with the main isolating switch, integrated electromechanical switching equipment, conversion driven by a motor, a smooth transition and fast, and has had 0 features. ATSE dual power switch on the market is currently divided into three series, ATSE in the market is mainly divided into three series, excitation, double breaker type, mechatronic smart. Which mechatronic smart (PC level) only domestic Shanghai Thai Industries Limited production ZTQ products, foreign production of Schneider products. Every owner can choose the right product according to their actual situation. But prospects of PC-ATSE is unlimited. On dual power switch at the Expo venue, Xi'an subway power protection application Africa Joint Pavilion without any power supply problems occur in one hundred eighty-four days of the exhibition, the hard work is inseparable from the electric power security personnel from not Expo area open reliably power supply, but also inseparable dual power automatic switching devices and UPS, EPS device in the museum in a reasonable and effective application. In the future, a major insurance electric activity, in addition to the construction of reliable power supply and the development of rational contingency plans, but also widely used in dual-supply automatic switching devices and UPS, EPS device isolation dual power, to protect all kinds of critical loads in the loss of mains case of continuous reliable operation. Xi'an subway project ASCO dual power automatic transfer switch solutions to solve the world's subway traffic congestion problem in many cities, and a large, fast and safe delivery of a modern transport passengers. Metro is not only to expand the city's transportation capacity, and will further enhance the efficiency of urban construction development. With the growing current urban subway construction, subway construction for urban development has played a pivotal role. Subway construction mainly through important places by connecting subway station, subway tunnels. Subway stations are generally divided into two underground floors, the ground floor is called the station hall, ground floor called the platform layer, each layer is divided into a public area and both ends of the device area. Public areas are passenger tickets, travel area, equipment area is the variety of professional equipment room, such as automatic fare collection, communication, signal, pumping stations, gas fire, lighting, power distribution room, computer room environmental control, environmental control power control room, traction / step-down substation, battery room, control room screen door, the station control room, as well as Metro Fire Hager dual power circuits, etc. _ double-Electric (certified) _ dual power only by Shanghai Thai Industries Limited Yueqing Branch provided. Shanghai only Thai Industrial Co., Ltd. Yueqing Branch (www.cnats.cc) is Wenzhou, Zhejiang Province, switch leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the only Thai Industries led the staff warmly welcome all inquiries negotiations to create only a better future for Thai Industries.