| Brand | ROCKWILL |
| Series | RMR，REC |
ROCKWILL is a specialist manufacturer of SF6-free ring main units — dry-air and solid-insulated RMUs built in-house, type-tested to IEC 62271 and shipped under your brand to distributors, EPCs and utilities worldwide.
As a dedicated SF6-free RMU manufacturer, we own the whole process — design, vacuum-interrupter assembly, tank fabrication, type testing and export packing — so you get factory-direct pricing and consistent quality without the trading-company layer.
Metal-enclosure fabrication, vacuum interrupter mounting, sealing and routine testing all under one roof — controlled lead times and quality.
Choose dry compressed air insulation (most eco-friendly) or solid epoxy insulation (most compact), engineered to your site conditions.
Your nameplate, your manual, your packaging. We build to your brand guidelines and supply the technical literature your market requires.
Non-standard cable entries, mechanical layouts, voltage ratings, monitoring options — built from your single-line diagram.
Type-tested to IEC 62271, with test reports, CE documentation and FAT support for utility and industrial tenders.
Standard 12/24kV units in stock; sea-worthy export packing and full shipping documentation prepared for your forwarder.
We do not sell end-user retail. We partner with the businesses that put SF6-free RMUs into the grid.
Steady factory supply, competitive ex-works pricing and stock programs for your regional market.
RMUs built to your project single-line diagrams, with documentation for tender and site acceptance.
SF6-free fleets for networks targeting F-gas compliance and net-zero commitments.
Standard configurations we manufacture every month. Tell us your ratings for an exact datasheet.
| Parameter | Typical value |
|---|---|
| Rated voltage | 12kV / 24kV (up to 36kV solid-insulated) |
| Insulation | Dry compressed air or solid epoxy — both SF6-free, zero GWP |
| Interruption | Sealed vacuum interrupter |
| Busbar current | 630A (up to 1250A on request) |
| Short-time withstand | 20kA / 3s (25kA on request) |
| Configuration | 2-4 ring incomers + transformer feeder (switch-fuse / VCB) |
| Standard | IEC 62271-1, -102 / -103 / -200 as applicable |
| Monitoring | Optional pressure, position and SCADA / DA interface |
| Brand | OEM / ODM private label supported |
Want the product itself first? See our SF6-free RMU product overview.
Yes. OEM/ODM is core to our business: we apply your nameplate, produce your manuals and packaging, and supply the technical data sheets and certificates your customers expect.
Standard 12/24kV configurations can be ordered in small trial batches; container quantities qualify for volume pricing. Contact us with your target quantity for a pricing tier.
Yes. Send your single-line diagram, voltage, fault level, cable entry and any monitoring requirements — our engineering team will return a buildable layout.
Commercial invoice, packing list, Bill of Lading handling, type-test reports, CE/FAT documentation and certificates of origin as required by your market.
Our RMUs use vacuum interruption plus dry air or solid insulation, delivering the same IEC 62271 class performance with zero global-warming potential — see the full Dry Air vs SF6 comparison.
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