Accelerate grid digitisation with smart RMUs
Modernise your grid with the smart RMU
Seamlessly integrated with the Easergy T300 remote terminal unit (RTU) and our innovative conditional monitoring sensors, the smart ring main unit (RMU) is an innovative solution that makes it easier for you to answer the evolving challenges of electrical distribution. As an all-in-one solution, the smart RMU is easy to purchase, install and maintain, helping to reduce operational costs. Its robust design fits even the harshest environments.
Improve energy availability
Reduce outage time by detecting faults early and automatically reconfiguring the network afterwards. Integrate intermittent and distributed generation smoothly to maintain energy quality and stability.
Optimise network performance
Get your grid ready for growing energy demand. With advanced analytics, you can optimise asset management, manage load shedding and peak shaving, and reduce technical and non-technical losses.
Why choose our smart RMU
- Enjoy the advantages of grid connectivity without worrying about the security of your data. The smart RMU is compliant with IEC 62351, IEEE 1686 role-based access control (RBAC) and Achilles Practices.
- Benefit from reduced maintenance costs with smart sensors for substation monitoring.
- Improve energy availability with a cost- and time-effective solution (SAIDI).
Discover how digitisation, decarbonisation and decentralisation are transforming the energy world.
Condition monitoring of ring main units (RMU)
Find out how an effective asset management and capital improvement program aims to pinpoint the exact location of the distribution network needing maintenance and repair, without the guesswork.
Why choose smart RMU
- < 60 s
Faster power restoration thanks to decentralised schemes
Compliance with the latest cybersecurity standards
Expertise of the RMU market leader with +2.5 M installations worldwide
Smart RMU Connected Enabled
Our entry-level offer will help you improve everyday equipment maintenance and reduce OpEx costs. It features wireless thermal sensors and a smartphone app to replace infra-red thermal scanning. It also enables early detection of conditions that can result in electrical connection failures, fires, arc flashes or worse.
Smart RMU Connected Advanced
Discover our fully optimised and integrated, advanced-level offer for controlling, metering, condition monitoring and fault detection. Reduce operation and maintenance expenditures and optimise your networks for increased demand. This advanced solution is available for RM6, FBX and Ringmaster.
RM6
Learn more about our 2,000,000+ modules with installed MV ring main unit.
Discover nowFBX
Discover flexible installation in compact or extensible applications.
Find out moreRingmaster
Find out more about our MV ring main units for outdoor applications.
Learn moreEasergy T300
Discover a powerful Remote Terminal Unit (RTU) for feeder automation.
View more
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What does a ring main unit do?
An RMU (Ring Main Unit) is a compact, enclosed switchgear device that distributes, controls, and protects medium-voltage electrical networks, ensuring reliable power supply, rapid fault isolation, and improved grid efficiency in a wide range of industrial and utility settings.
Key features and functions of an RMU
An RMU provides essential functions for electrical distribution: circuit control, fault isolation, and network protection. It comprises switches, circuit breakers, and fuses to manage load switching, safeguard transformers, and minimize outage risks. Compact and robust by design, RMUs ensure continuous supply, quick restoration during faults, and compliance with international safety standards. These units help utilities reduce operational costs and improve reliability while supporting efficient asset and network management in both secondary and distribution grids.
Applications of an RMU
Ring main units are widely used in urban and industrial power networks to enable stable electricity distribution and efficient load management. RMUs supply power in residential complexes, commercial buildings, hospitals, ports, and substations, as well as renewable energy sites like wind and solar power plants. Their ability to quickly isolate faults and reroute power makes them ideal for environments where uninterrupted energy is critical, ensuring operational safety and reliability across compact secondary substations and dense metropolitan infrastructure.