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Hlc-12 Maintenance Free 11kv 12kv Sf6 Gas Insulated Ring Main Unit 630A. Highly sealed SF6 gas tank, stable and reliable performance for long term outdoor operation. Low gas leakage rate less than or equal to 0.05 percent, stable SF6 gas insulation performance for long term service. Gas tank protection grade IP67, cabinet shell IP4X, reliable performance for complex outdoor working conditions.