Reliable Medium‑Voltage RMUs — 11 & 33 kV Solutions for Utility and Industrial Networks

Unitraf Engineering supplies high‑standard 11 kV and 33 kV Ring Main Units (RMUs) designed in accordance with IEC 60298, IEC 60694, and related international standards. The RMUs feature SF₆‑insulated, hermetically sealed switchgear, internal arc protection, and extensible modular configurations suitable for utility, industrial, and agricultural distribution networks. With rated currents up to 630 A, short‑circuit withstand levels up to 20 kA, and integrated protection relays, Unitraf’s RMUs deliver reliable, maintenance‑free operation and full compatibility with modern SCADA and automation systems, ensuring safe and efficient medium‑voltage power distribution.

Standards & Compliance

Unitraf’s RMUs follow the same standards required for high‑quality MV switchgear:

    • IEC 60298 — AC metal‑enclosed switchgear above 1 kV

    • IEC 60694 — Common specifications for HV switchgear

    • IEC 60529 — IP protection levels

    • IEC 60129 / 60265 / 60056 — Switches, isolators, circuit breakers These standards ensure safety, reliability, and long‑term performance.

Voltage Classes

  • 11 kV / 12 kV class RMUs for distribution networks

  • 33 kV class RMUs for industrial feeders, substations, and agricultural pumping stations Both voltage classes use similar design philosophies: compact, sealed, SF₆‑insulated modules.

Construction & Insulation

  • SF₆ gas‑insulated, hermetically sealed tanks

  • Stainless‑steel or epoxy‑coated enclosures

  • 30‑year sealed‑for‑life gas system (typical for high‑quality RMUs)

  • Internal arc‑tested for operator safety

  • IP4X/IP2X protection depending on configuration These features ensure reliability even in harsh environments such as industrial zones or agricultural fields.

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