How to choose a load switch models? 1. Rated voltage switch must not be less than the system voltage. 2. The switch current rating must not be less than the actual line current. 3. The switch closing current must not be less than the short circuit current at the installation location. Shunt release operation as power supply and take-over current substation "less people on duty", "lights-out" promotion of load switch, in order to meet the basic requirements for running remote operation unit, the selection Xi'an load switch load switch, you need to Configuring the shunt release for protection trip use, the load switch sub-gate load switch manufacturers when an overload protection by means of direct sales, the fuse is only for short circuit protection. Action by the shunt trip so that the combination of electrical load switch breaking, called release operation. Relay and fuse time - current curve is not the same as load switch price, in conjunction with the inevitable intersection. Protection of operating characteristics and safety fuses - second characteristic point of intersection called "over current." Engineering by IEC to determine the maximum over current methods are: An arc in front of the largest fuse - Timeline second characteristic of taking the minimum load switch opening time, with 20ms protection external relay minimum operating time, which is the current value of the corresponding The maximum transfer current. High voltage vacuum load switch _ Huayi Electric Power (certified) _ Wuhan load switch provided by Xian Huayi power plant. Xian Huayi Electric Power Equipment Factory (www.xahy.com) is a leader in Xi'an high-voltage circuit breakers, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Huayi Electric Power leadership with the staff warmly welcome all inquiries negotiations to create Huayi electricity better future.