Ring Main Unit (RMU) – Medium Voltage Switchgear

Product Overview

The Ring Main Unit (RMU) is a compact, modular, and fully enclosed medium-voltage switchgear designed for reliable power distribution in 12kV/24kV networks. It integrates load switches, vacuum circuit breakers, and earthing switches into a single metal-enclosed unit, ensuring safe and uninterrupted electricity supply for industrial, commercial, and utility applications.

Our RMU is available in SF6 gas-insulated, solid-insulated, and environmentally friendly gas-insulated configurations to meet diverse project requirements. With a robust enclosure, intelligent protection relays, and flexible extensibility, this switchgear delivers superior performance in both indoor and outdoor environments.

Key Features

• Fully Insulated & Fully Sealed Design – Primary circuits are enclosed in a sealed gas tank or solid insulation system, ensuring maintenance-free operation and high reliability.

• Compact & Space-Saving – Minimal footprint with cabinet widths starting from 375mm, maximizing space utilization in substations and switch rooms.

• Flexible Configuration – Available in modular, extensible designs to support side-extension and top-extension configurations for easy system expansion.

• Robust Construction – Shot-blasted, zinc-sprayed, and epoxy powder-coated enclosure ensures corrosion resistance and durability for harsh environments.

• Reliable Interlocking System – Mechanical interlocks between load switch, circuit breaker, and earthing switch guarantee safe operation and maintenance.

• Intelligent Protection – Equipped with self-powered electronic protection relays, earth fault indication, and remote control/signaling capabilities.

• Eco-Friendly Options – SF6-free models utilize environmentally friendly insulating gases, reducing carbon footprint and environmental impact.

Technical Specifications

Specifications are subject to customization based on project requirements.

Applications

Our Ring Main Unit is widely used in medium-voltage distribution networks for receiving and distributing electrical energy. Typical applications include:

• Urban Residential Areas – Reliable power supply for housing complexes and communities.

• Commercial Buildings – Shopping malls, office buildings, hotels, and business centers.

• Industrial Facilities – Industrial plants, mining enterprises, and manufacturing sites.

• Infrastructure Projects – Airports, railways, subways, tunnels, and highways.

• Renewable Energy – Wind farms and solar power stations.

• Public Facilities – Hospitals, stadiums, schools, and government buildings.

• Small Substations & Switch Rooms – Compact distribution substations, cable branch boxes, and box-type substations.

Why Choose Us

• Certified Quality – Our products comply with international standards (IEC, GB) and are audited by SGS/BV.

• Customized Solutions – We offer tailored configurations, voltage ratings, and enclosure options to meet specific project needs.

• Competitive Pricing – Direct factory pricing with no middlemen, ensuring cost-effectiveness for bulk orders.

• Fast Delivery – Located in Zhejiang, China, with a well-established supply chain and logistics network.

• Comprehensive Support – Professional technical support, installation guidance, and responsive after-sales service.

Ordering Information

Minimum Order Quantity: 1 Piece
Packaging: Standard export wooden case
Shipping: FOB Shanghai/Ningbo