| Brand | ROCKWILL |
| Series | KYN |
Dry Air RMU Manufacturer
ROCKWILL designs and manufactures medium-voltage ring main units insulated with compressed dry air — a fully SF6-free alternative that meets IEC 62271-1 and IEC 62271-102/103, without any greenhouse gas.
Values below are representative of our standard range. Exact ratings for your project are confirmed in the datasheet — contact us for the certified version.
| Parameter | Typical value |
|---|---|
| Rated voltage | 12kV / 24kV (up to 36kV on request) |
| Rated frequency | 50 / 60 Hz |
| Insulation medium | Dry compressed air (SF6-free, zero GWP) |
| Breaking device | Vacuum interrupter, sealed |
| Busbar / load-break / fault level | 630A busbar; load-break & switch-fuse protection units |
| Rated short-time withstand | 20kA / 3s (typical, 12-24kV class) |
| Standard | IEC 62271-1, IEC 62271-102 / -103 |
| Degree of protection | Up to IP4X / IP5X, indoor type |
| Application | Secondary distribution, ring networks, transformer feeder cabinets |
Yes. Modern dry-air design uses sealed vacuum interruption and dry compressed air for insulation, reaching the same 12/24kV class ratings and short-circuit levels as conventional SF6 RMUs, while eliminating the greenhouse gas entirely.
Our standard dry air ring main units cover 12kV and 24kV; 36kV solid/dry-insulated units are available on request. Tell us your rated current and fault level for an exact configuration.
Yes. As a manufacturer we supply distributors, EPC contractors and switchgear brands under OEM/ODM arrangements, including your own nameplate, packaging and custom mechanical layouts.
Units are type-tested to IEC 62271-1 and the relevant product standards, with test reports, CE documentation and factory acceptance support supplied for each shipment.
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