Pure Air/Nitrogen Insulated SF6-Free Ring Main Unit

This PDF product manual serves for tender comparison, distribution‑substation project selection and pre‑sales technical evaluation. This eco‑friendly gas‑insulated ring‑main‑unit complies with IEC 62271‑1, IEC 62271‑200 and relevant ANSI standards.

It adopts vacuum interruption with pure‑air or nitrogen zero‑GHG insulating medium, fully‑sealed gas‑tank achieving IP67 and cabinet shell IP4X, type‑tested annual gas‑leakage rate as low as 0.01 %. This manual records comprehensive dielectric‑withstand values, loop resistance ≤140 µΩ, rated / minimum operating gas pressure, multi‑grade mechanical‑life for circuit‑breaker, load‑break‑switch, disconnector and earthing‑switch, operating‑sequence, wide service‑environment covering ‑40 ℃ ~ +55 ℃ and altitude up to 2500 m.

It features double visible isolating gaps, five‑protection interlock mechanism, zinc‑alloy‑inlaid anti‑corrosion surface‑treatment, multiple cabinet‑form options including upper‑isolation and lower‑isolation layout with compact bay dimensions.

Custom‑manufacturing covering design adjustment, assembly and project‑specific factory‑acceptance‑test is available for diverse distribution‑grid projects. Please contact us for complete dimension drawings and full set of type‑test reports.