Ring main unit（RMU）
Engineered for reliable and sustainable power distribution, our Air Insulated Switchgear (AIS RMU) provides a highly dependable, cost-effective, and 100% SF6-free solution for medium voltage secondary networks. Utilizing ambient air as the primary insulation medium and vacuum technology for arc quenching, this switchgear eliminates greenhouse gas regulations and reduces end-of-life disposal costs.
Designed strictly to IEC 62271-200 standards, our AIS features a modular and extensible architecture, allowing for flexible configurations using Load Break Switches (LBS), Vacuum Circuit Breakers (VCB), and fuse combinations. It is the ideal choice for indoor substations, commercial buildings, and industrial facilities where space allows and budget optimization is key.
Product Description
Engineered for reliable and sustainable power distribution, our Air Insulated Switchgear (AIS RMU) provides a highly dependable, cost-effective, and 100% SF6-free solution for medium voltage secondary networks. Utilizing ambient air as the primary insulation medium and vacuum technology for arc quenching, this switchgear eliminates greenhouse gas regulations and reduces end-of-life disposal costs.
Designed strictly to IEC 62271-200 standards, our AIS features a modular and extensible architecture, allowing for flexible configurations using Load Break Switches (LBS), Vacuum Circuit Breakers (VCB), and fuse combinations. It is the ideal choice for indoor substations, commercial buildings, and industrial facilities where space allows and budget optimization is key.
Core Features & Advantages
Eco-Friendly & SF6-Free: Relies entirely on dry air for insulation. Fully compliant with stringent global environmental regulations, eliminating the need for gas monitoring and specialized disposal.
Visible Isolation for Ultimate Safety: Unlike sealed gas tanks, our AIS is designed with inspection windows. Operators can physically verify the open/closed/earthed status of the switch contacts, providing peace of mind during maintenance.
Highly Cost-Effective (Lower CAPEX): Offers a significantly lower initial investment compared to Gas Insulated Switchgear (GIS). The simplified structure also means readily available spare parts and lower routine maintenance costs.
Modular & Extensible Design: Features a highly flexible architecture. Cabinets can be easily added or replaced on-site to expand the ring network without disrupting the existing infrastructure.
Smart Automation Ready: Fully compatible with distribution automation. Can be equipped with motorized operating mechanisms, Fault Passage Indicators (FPI), and Remote Terminal Units (RTU) for seamless integration into modern SCADA systems.
Technical Specifications
Applicable Standards | IEC 62271-200, IEC 62271-100, IEC 62271-103 |
Rated Voltage | 12kV / 17.5kV / 24kV |
Rated Frequency | 50Hz / 60Hz |
Insulation Medium | Air |
Rated Current (Busbar) | 630A / 1250A |
Rated Current (LBS / VCB) | 630A / 1250A |
Short-time Withstand Current | Up to 25kA for 3s |
Internal Arc Classification (IAC) | IAC A-FL 20kA / 1s (Standard) |
Degree of Protection | IP3X / IP4X (Enclosure) |
Loss of Service Continuity | LSC2A |
Main Applications
• Commercial & Residential Real Estate: Basement substations and electrical rooms where environmental control is maintained.
• Industrial Plants: Manufacturing facilities and mining camps requiring robust, easily maintainable switchboards.
• Compact Secondary Substations (CSS): Easily integrated into packaged substations (kiosks) for urban grid expansion.
• Green Energy Projects: Installations prioritizing zero greenhouse gas emissions and sustainable supply chains.
