Explore Rockwill’s centralized resource hub for critical technical documentation and industry knowledge. We provide downloadable white papers on smart grid trends, fault detection technologies, and energy transition strategies — ideal for engineers, project planners, and utility operators.
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Air insulated Ring Main Unit (RMU)
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ROCKWILL Air insulated Ring Main Unit (RMU) is factory-assembled, metal-enclosed modular switchgear for medium voltage distribution systems. It uses atmospheric air as the insulating medium, equipped with load break switches and optional fuse combination units for transformer protection. The modular design allows flexible combination of ring-in, ring-out and transformer protection bays. The product complies with IEC 62271-1:2017, IEC 62271-103:2019 and IEC 62271-200:2021. Relevant documents incl
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SM66 type 36kV 40.5kV air insulated Ring Main Unit (RMU)
Catalogue
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ROCKWILL SM66 type 36kV / 40.5kV air insulated Ring Main Unit (RMU) is modular metal-enclosed medium voltage switchgear for 36kV distribution system with rated maximum voltage 40.5kV. It uses atmospheric air as insulating medium, fitted with high-performance load break switch and optional fuse combination unit for transformer protection. The product complies with IEC 62271-1:2017, IEC 62271-103:2019 and IEC 62271-200:2021. Relevant documents include Type Test Certificate No. TT-2025-04135, Witne
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GCS Type LV withdrawale switchgear
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ROCKWILL GCS Type LV withdrawable switchgear is low voltage withdrawable metal enclosed switchgear designed for three-phase AC 50Hz power system, rated operational voltage up to 690V. It adopts modular assembly structure with withdrawable functional units for motor control, power distribution and protection. The product complies with IEC 60439-1:2019, IEC 61439-1:2019 and IEC 61439-2:2021. Relevant documents include Type Test Certificate No. TT-2025-04140, Witness Test Report No. WT-2025-09073,
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MNS Type LV withdrawable switchgear
Catalogue
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ROCKWILL MNS Type LV withdrawable switchgear is modular low voltage withdrawable metal-enclosed switchgear for three-phase AC 50Hz power system with rated operational voltage up to 690V. It features compact modular structure, withdrawable functional units for power distribution and motor control. The product complies with IEC 61439-1:2019 and IEC 61439-2:2021. Relevant documents include Type Test Certificate No. TT-2025-04144, Witness Test Report No. WT-2025-09077, Routine Factory Test Report No
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OMR Type Outdoor Gas Insulated Ring Main Unit
Catalogue
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ROCKWILL OMR Type Outdoor Gas Insulated Ring Main Unit is compact metal-enclosed modular switchgear designed for outdoor medium voltage distribution networks. Its primary live components are sealed within a stainless steel tank filled with insulating gas, delivering high integration and stable performance regardless of dust, moisture and temperature fluctuation. The product complies with IEC 62271-1:2017, IEC 62271-103:2019 and IEC 62271-200:2021. Relevant documents include Type Test Certificate
