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Maintenance typically includes periodic visual inspection, mechanism and contact checks, battery/UPS testing, communication testing, and firmware updates. The air-insulated design allows easier inspection compared with sealed SF6 designs.
| Brand | ROCKWILL |
| Series | RMR,RGIS,REC |
Manufacturer: Rockwill
Rockwill Air Insulated RMU is an SF6-free, air-insulated medium-voltage ring main unit designed for 12 kV to 40.5 kV distribution networks. It uses ambient air as the insulating medium and vacuum interrupters for switching, integrating 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 modular metal-enclosed assembly.
It supports remote monitoring, fault detection, isolation, and service restoration, making it suitable for smart grid and distribution automation applications. Rockwill also provides OEM/ODM/private label and contract manufacturing services, with customized branding and production according to customer requirements.
Air-insulated and SF6-free design
Vacuum interruption for reliable switching
Modular configurations: 2-way, 3-way, 4-way, 5-way, extensible
Metal-enclosed construction for indoor and outdoor use
Manual/electrical operation with local/remote control
SCADA-ready with IEC 61850, DNP3.0, Modbus RTU/TCP, IEC 60870-5-101/104
Protection functions: overcurrent, earth fault, over/under voltage, auto-reclose
Fault passage indication and distributed automation compatible
Mechanical interlocking and arc-fault protection optional
Compact layout, easy inspection, and low maintenance
OEM/ODM/private label and contract manufacturing available
Custom logo, nameplate, color, enclosure, configuration, and technical parameters
Urban and rural secondary distribution networks
Ring main units and compact secondary substations
Industrial parks, airports, railways, tunnels, and data centers
Wind, solar, and renewable energy collection systems
Utility smart grid and distribution automation upgrades
Projects requiring SF6-free or environmentally friendly switchgear
Distributors, integrators, and brand owners requiring OEM/ODM or contract manufacturing
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: air
Switching devices: load break switch, vacuum circuit breaker, earthing switch
Protection functions: overcurrent, earth fault, over/under voltage, auto-reclose
Communication protocols: IEC 61850, DNP3, Modbus, IEC 60870-5-101/104
Operating mechanism: manual/electrical, local/remote
Enclosure protection: IP3X / IP4X indoor, IP54 / IP65 outdoor optional
Ambient temperature: -25°C to +55°C, wider range optional
Standards: IEC 62271-200, IEC 62271-100, IEC 62271-102
Customization: OEM/ODM/private label, contract manufacturing, custom branding and drawings
Eliminates SF6 gas and related environmental risks
Reduces gas monitoring and environmental compliance costs
Easy visual inspection and maintenance due to air insulation
Reliable vacuum switching and fault isolation
Flexible modular design for different network layouts
Supports renewable integration and smart grid development
Suitable for indoor and outdoor installations
Flexible OEM/ODM/private label and contract manufacturing support
It is an SF6-free medium-voltage ring main unit that uses air as the insulating medium and vacuum interrupters for switching. It combines switching, protection, metering, and automation functions in one modular unit.
An air insulated RMU typically uses ambient air at atmospheric pressure as insulation, while a dry air RMU uses a sealed tank filled with dry air, often with a more compact design. Both are SF6-free alternatives.
Rockwill offers 2-way, 3-way, 4-way, and 5-way modular configurations, with load break switches, vacuum circuit breakers, earthing switches, and extensible busbar options.
Yes. It 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.
Yes. Rockwill supports OEM, ODM, private label , and contract manufacturing . We can produce according to customer drawings, technical specifications, or samples, and customize logo, nameplate, color, packaging, protection functions, communication modules, and enclosure.
