Brochure · ROCKWILL

24kV SF6 Gas insulated Ring Main Unit (RMU)

SF₆ gas-insulated RMU: 24kV, up to 1250-1375A, lightning impulse 125kV, 4s short-time 20-25kA, making peak 50-63kA. Upper- and lower-isolation cabinet options available.

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Updated2026.09

LanguageEnglish

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SF6 Gas insulated Ring Main UnitRMUBrochure

Document description

SF6 Gas insulated Ring Main Unit features compact 500‑mm‑width cabinet with SF₆ gas insulation. Innovative design for vacuum interrupter & disconnector solves high‑current temperature‑rise issue. Modular five‑anti interlock with lower‑door emergency unlock, lower‑door only opens with fully‑earthed main‑circuit, complying with IEC & GB RMU standards.

Frequently asked questions

How does solve the temperature‑rise problem under high‑current working condition?

It adopts innovatively‑designed vacuum interrupter and isolating knife‑switch; simple primary‑circuit layout and uniform electric‑field distribution realize reliable temperature‑rise performance for 1375A rated current.

What insulation medium is used for SF₆ gas‑insulated RMU?

The gas‑box is filled with SF₆ insulating gas, its insulation performance meets IEC and GB standard requirements for medium‑voltage switchgear.

What safety interlock and emergency‑unlock functions does SF₆ gas‑insulated RMU have?

It adopts modular five‑anti mis‑operation interlock. Emergency unlock device is fitted on lower door. The lower door can only be opened when main‑circuit is fully earthed; the earthing switch can only be opened and breaker can only be closed after lower door is fully closed.

24kV SF6 Gas insulated Ring Main Unit (RMU)

Document description

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Frequently asked questions