Main features: 1. Excellent interrupting capability Design interrupter units can withstand severe RRRV in case of any short-line fault. When switching induced current, overvoltage is lower than 2 times of service voltage. When switching capacitive current, no re-ignition and re-strike occur. 2. Dielectric reliability and current-carrying capability SF6 gas feature will not be attenuated with the time changing; hence the reliability can be assured. The gas can also prevent the contact from oxidization and other chemical reaction.3. Minimized maintenance work Spring mechanism requires minimized maintenance work; the SF6 gas will not attenuate and the contact wearing can be neglected. 4. Minimized operation noise Because of no released gas, hence the operation noise can be minimized. 5. Excellent anti-seismic capability Simple structure and small weight allows the product an excellent anti-seismic performance. 6. Air-free and oil-free Air-free and oil-free for all mechanism, which ensures reliable and safe service. 7. Minimized SF6 gas leakage rate SF6 gas system is placed more reasonably without gas valves and pipes, using new type self-sealing adaptor, which minimizes the gas leakage rate. 8. Main bus current4000A, rated short-time current 40kA, rated short-circuit time 4s. 9. Intelligent and digital control, in stead of electromagnetic relay control method; more flexible and convenient. 
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