What is the function of a Ring Main Unit (RMU)?
A ring main unit consists of three switches, two inputs with the electrical interlock and one going out to the load. It is used in an electrical distribution system for an uninterrupted power supply. Furthermore, it offers effective protection to the side transformer from transient currents.
Schneider Electric UK’s smart ring main unit (RMU), with its innovative conditional monitoring sensors, offers an effective solution for you to stay in tune with the evolving confrontations in electrical distribution. The smart RMU is seamless to purchase, install, and maintain. The design offers unparalleled outdoor durability.
Why is Ring Main Unit (RMU) required?
A ring main unit is essential to monitor faults and automatically reconfigure the network post-detection. It maintains the stability and quality of the energy to improve the overall energy availability. Moreover, RMU optimises the network performance to allow your grid to stay in sync with the increasing energy demands. Advanced analytics enable an RMU to optimise asset management, minimise technical and non-technical losses, and manage peak shaving and load shedding.
At Schneider Electric UK, our smart ring main unit assures the protection of your data and is compliant with IEC 62351, IEEE 1686 role-based access control (RBAC) and Achilles Practises.
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.
What is a Ring Main Unit?
Ring Main Unit (RMU) is a medium voltage, gas-insulated, fully sealed cabinet used to measure, connect, and integrate transformer protection functions with a fixed type breaker. Ring Main Units are safe, reliable, low-maintenance, and easy to replace switchgear. Depending on the user's needs and requirements, RMUs are available in many voltages, suitable for both outdoor and indoor installations. At Schneider Electric, we help you modernise your grid with innovation and digitisation with our wide range of Smart Ring Main units.
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.
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).
Why choose smart Ring Main Unit (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 Ring Main Unit (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.
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Thermal Monitoring
124/7 connected monitoring to highlight hotspots and take preventive action. -
Easergy Thermal Connect App
2Simple-to-use app to read thermal data from sensors, available for free on Google Play store. -
NFC Tag
3Centralise sensor data from a complete switchboard or application and data transferred by NFC communication. -
QR Code
4Fast and simple access to equipment data and documentation at your fingertips. -
Zigbee Dongle
5Enables local communication between smartphone/tablet and sensors.
Thermal Monitoring
124/7 connected monitoring to highlight hotspots and take preventive action.
Easergy Thermal Connect App
2Simple-to-use app to read thermal data from sensors, available for free on Google Play store.
NFC Tag
3Centralise sensor data from a complete switchboard or application and data transferred by NFC communication.
QR Code
4Fast and simple access to equipment data and documentation at your fingertips.
Zigbee Dongle
5Enables local communication between smartphone/tablet and sensors.
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.
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Easergy T300
1Powerful, flexible and future-ready RTU that addresses key challenges in distribution network operation. -
Easergy Switch Controller
2Switchgear remote control and monitoring -
QR Code
3Fast and simple access to equipment data and documentation at your fingertips. -
LPVT
4Low-Power Voltage Transformer -
VPIS
5Self-powered Voltage Presence Indicating System -
Thermal Monitoring
624/7 connected monitoring to highlight hotspots and take preventive action. -
Environment Monitoring
724/7 connected monitoring to highlight condensation enabling users to prevent fast ageing. -
CT
8Current Transformer for MV measurement and fault detection.
Easergy T300
1Powerful, flexible and future-ready RTU that addresses key challenges in distribution network operation.
Easergy Switch Controller
2Switchgear remote control and monitoring
QR Code
3Fast and simple access to equipment data and documentation at your fingertips.
LPVT
4Low-Power Voltage Transformer
VPIS
5Self-powered Voltage Presence Indicating System
Thermal Monitoring
624/7 connected monitoring to highlight hotspots and take preventive action.
Environment Monitoring
724/7 connected monitoring to highlight condensation enabling users to prevent fast ageing.
CT
8Current Transformer for MV measurement and fault detection.
