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Maintenance typically includes periodic visual inspection, mechanism and contact checks, battery/UPS testing, communication testing, and firmware updates. The sealed dry air tank requires minimal maintenance compared with SF6 designs.
| Brand | ROCKWILL |
| Series | RMR,RGIS,REC |
Manufacturer: Rockwill
Rockwill Dry Air RMU is an SF6-free, environmentally friendly medium-voltage ring main unit that uses dry air as the insulating medium. It integrates load break switches, vacuum circuit breakers, earthing switches, current/voltage transformers, digital protection relays, motorized operating mechanisms, fault indicators, and RTU/FTU/DTU units in a compact, sealed assembly.
It is designed for 12 kV, 24 kV, 36 kV, and 40.5 kV distribution networks, supporting remote monitoring, fault detection, isolation, and service restoration for smart grid and distribution automation applications.
SF6-free dry air insulation, no greenhouse gas emissions
Sealed stainless steel tank, IP67 gas tank protection
Enclosure protection IP54 / IP65 optional
Modular configurations: 2-way, 3-way, 4-way, 5-way, extensible
Load break switch, vacuum circuit breaker, and earthing switch options
Motorized operation, local/remote control, SCADA-ready
Communication protocols: IEC 61850, DNP3.0, Modbus RTU/TCP, IEC 60870-5-101/104
Fault passage indication, overcurrent, earth fault, over/under voltage, auto-reclose optional
Mechanical interlocking, arc-fault protection, arc-resistant design optional
Compact footprint, low maintenance, recyclable components
Urban and rural secondary distribution networks
Ring main units and compact substations
Wind and solar renewable energy projects
Industrial parks, airports, railways, tunnels, and data centers
Utility smart grid and distribution automation upgrades
Areas with strict environmental or SF6 reduction requirements
Rated voltage: 12 kV / 24 kV / 36 kV / 40.5 kV
Rated current: 630 A / 1250 A
Rated short-time withstand current: 20 kA / 25 kA / 31.5 kA
Insulating medium: dry air
Switching devices: load break switch, vacuum circuit breaker
Protection functions: overcurrent, earth fault, over/under voltage, auto-reclose
Communication: IEC 61850, DNP3, Modbus, IEC 60870-5-101/104
Operating mechanism: manual/electrical, local/remote
Enclosure protection: IP54 / IP65 optional
Ambient temperature: -25°C to +55°C, wider range optional
Standards: IEC 62271-200, IEC 62271-100, IEC 62271-102
Eliminates SF6 gas use and related environmental risks
Reduces maintenance and gas monitoring costs
Improves reliability through automation and remote diagnostics
Supports renewable integration and smart grid development
Flexible modular design for different network layouts
Safe, compact, and suitable for indoor and outdoor installations
It is an SF6-free medium-voltage ring main unit that uses dry air for insulation and integrates switching, protection, metering, and automation functions in one compact unit.
Dry air avoids SF6 greenhouse gas emissions, simplifies end-of-life recycling, and reduces environmental compliance and gas monitoring requirements.
Typical ratings include 12 kV, 24 kV, 36 kV, and 40.5 kV, with 630 A or 1250 A busbar and feeder ratings, and short-time withstand currents of 20 kA, 25 kA, or 31.5 kA.
Yes. Rockwill Dry Air RMU can be equipped with motorized mechanisms, fault indicators, RTU/FTU/DTU, and communication protocols such as IEC 61850, DNP3, Modbus, and IEC 60870-5-101/104 for SCADA and FLISR applications.
