Ring Main Unit vs Metal-Clad Switchgear (KYN28): Choosing MV Switchgear for a Distribution Substation
Compare RMUs and metal-clad KYN28 switchgear on IEC 62271-200 classes, fault levels, extensibility, protection and cost.
· 9 min readHV & LV Switchgear
This medium-voltage switchgear, offered as an SF6 gas-insulated ring main unit, covers 12 kV, 24 kV, and 33 kV networks with current ratings up to 630 A…
| Parameter | Value |
|---|---|
| Product Type | SF6 Gas-Insulated MV/HV Switchgear (RMU) |
| Rated Voltage | 12 kV / 24 kV / 33 kV |
| Rated Current | 630 A / 1600 A / 2500 A |
| Frequency | 50 / 60 Hz |
| Insulation | SF6 Gas |
| Protection Level | IP65 (IP30/IP32/IP40/IP66 optional) |
| Enclosure Material | Aluminium-Zinc Coated Plate |
| Application | Electric Power Transmission & Distribution |
| Feature | Energy Saving |
| Certification | ISO9001, Test Report |
| Color | Customized |
| Packing | Wooden Case |
These figures reflect the product data supplied to us. Final dimensions, materials, colors, and packaging depend on the sample and order that get confirmed.
Designed and tested to ISO9001, Test Report. Millenium production is certified to ISO 9001, ISO 14001 and ISO 45001; the product family carries CE (ECM), UDEM attestation and an EAC declaration of conformity. Every unit passes routine factory tests before dispatch.
This medium-voltage switchgear, offered as an SF6 gas-insulated ring main unit, covers 12 kV, 24 kV, and 33 kV networks with current ratings up to 630 A, 1600 A, or 2500 A. Its compact metal-enclosed cabinets deliver dependable switching and protection for power transmission and distribution, sealed to IP65 for indoor use and tougher environments. Construction uses aluminium-zinc coated steel and the line carries ISO9001 certification.
Each panel is built in three tiers: a measurement-and-control section on top, an SF6-insulated switching and busbar section in the middle, and a cable/protection compartment at the base — with mimic diagrams and status indicators mounted on the front for quick reading. The sealed SF6 chamber holds its insulation performance steady no matter the ambient humidity, and the coated-steel shell fends off corrosion to keep the unit running safely over the long term.
Suited to medium-voltage distribution for utilities, substations, industrial plants, commercial buildings, renewable-energy sites, and infrastructure projects that need compact and dependable ring-main switching.
Voltage, rated current, panel layout, protection level, color, and busbar arrangement can all be matched to a project's single-line requirements.
SF6 gas insulation keeps the footprint compact and insulation stable even in humid or dusty conditions; IP65 sealing shields internal components from dust and moisture; Modular metal-enclosed panels adapt easily to ring-main and distribution layouts.
Voltage, rated current, panel layout, protection level, color, and busbar arrangement can all be matched to a project's single-line requirements.
Designed and tested to ISO9001, Test Report. Millenium production is certified to ISO 9001, ISO 14001 and ISO 45001, and the product family carries CE (ECM), UDEM attestation and an EAC declaration of conformity.
Quotation
Tell us the rating, voltages, frequency, quantity and destination. An engineer replies with a technical proposal, usually within one working day.