Ring Main Unit


Ring Main Unit (RMU) is mainly used in medium voltage distribution systems to control, protect, and distribute power. It is widely installed in the distribution network of industrial area or residential area to access and manage multiple power sources and loads. RMUs have abilities to connect branch cables, allowing electricity to flow through multiple paths and access multiple load points, allowing for efficient distribution and supply of power to meet the needs for reliable power supply and flexible operation.

Compact Design: RMU devices feature a compact design with a small footprint for installation in limited spaces, making them particularly suitable for scenarios in urban area and compact areas.

Integrated Function: RMU equipment integrates multiple functions such as disconnect switches, circuit breakers, load switches, transformers and protection devices. This design simplified the arrangement of the power distribution system and improved the system reliability and operational efficiency.

Safety: RMU equipment has multiple safety measures, such as electrical isolation, short-circuit protection, overvoltage protection, ground fault protection, temperature monitoring and mechanical interlocks, to ensure the safety of operator and equipment.

Adaptability: RMU support flexible power supply solution that enables power selection, distribution and switching. It and can adapt to different load requirements and distribution network configurations. RMU supports multiple power supplies and multiple paths of current flow, which improves the reliability and fault tolerance of the system.

High Reliability: RMU devices are made of high-quality materials and advanced manufacturing processes, which has good electrical performance and durability. RMU can operate stably under harsh environmental conditions.

As professional MV switchgear manufacturer, we provide fully customization service according to the customer’s local requirements, electricity standards, environments, climates and so on. The followings are supported for customization:

Rated Voltage:   According to the customer’s local electricity standard, we support various options of the rated voltage. 

Rated Current:   According to the customer’s load demand and power system’s capacity, we will provide suitable rated current options.

Environmental Adaptation Solution: According to the environmental conditions of the customer’s location, the corresponding protection solution is provided for high temperature, humidity, high salinity, corrosive and other harsh environments to ensure the stable operation of the equipment.

Wiring Method: According to the customer’s local power system requirements and distribution layout, we provide suitable wiring method options, such as top incoming, bottom incoming, side incoming, etc.

Isolator Switch Type:   According to the customer’s requirements and electrical standards, different types of isolator switches are optional for choose, such as manually operated, mechanically interlocked, or electrically actuated, to meet the needs of safety and operational convenience.

Circuit Breaker Type: We provide different types of circuit breaker options, such as load switches, vacuum circuit breakers, SF6 circuit breakers, etc.

Distribution Transformer Capacity:  According to the customer’s load requirements, the measurement range of current transformers in RMU equipment will be adjusted to ensure that the distribution system can provide sufficient power supply.

Additional Special Requirements:  Feel free to let us know if any other requirements we didn’t list above.

Feel free to contact us for any questions, or anything you think we could help.We are here to support in any way we can!






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