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LS Ring Main Units consist of a family of ring main units that control, protect, and isolate sections of your distribution network. Installed at feeder junctions in ring or radial topologies (commonly 12–36 kV), an RMU houses load-break switches or vacuum/circuit breakers, earthing switches, bus connections, and protection relays. Its job is to route power, quickly isolate faults, and maintain service continuity by allowing alternative feed paths; so a single fault doesn’t black out an entire area. RMUs are there to reduce footprint and civil works, simplify maintenance with drawer-type interrupters and visible isolation. In short, LS RMUs will keep medium-voltage distribution safe, serviceable, and resilient. LS RMUs are designed for modular expansion and seamless integration into substation automation, the series balances performance, lifecycle cost, and site safety.
Because they are purpose built for medium voltage distribution networks and because with these RMUs installed, you will understand full reliability, quick maintenance, and adaptable installation. We can go on and on counting the benefits that make these RMUs a strong choice for utilities and industrial sites.
LS Electric has engineered these RMUs to meet industry safety expectations (just like all of their products), and therefore you can count on secure earthing systems, clear isolation points, and maintenance modes that minimize exposure to live parts. Mechanical interlocks and positive indication of switch positions are also great features that reduce operator error during switching and service; You can rest assured regarding the protection of personnel and plant assets.
Space saving can be particularly valuable in urban substations and plant environments that do not have a lot of panel room to go around. Modular units allow you to add feeders or reconfigure bus layouts without a full replacement, reducing civil work and installation time.
As mentioned, LS RMUs are Modular, pre-assembled in their factories, and distributed in the market with drawer mechanisms for speed commissioning and low-effort onsite installation and maintenance. Standardized test packs and preconfigured control cabinets shorten FAT and SAT cycles, reducing project schedule risk.
We are talking drawer style interrupters, external operation handles, and easily accessible monitoring points that can help cut the time required for routine inspections and spares replacement. Predictable maintenance windows minimize downtime and improve mean time to repair.
Optional protection and control modules, metering, and IEC 61850 support allow RMUs to participate in substation automation schemes. Field installable SCADA gateways ensure remote visibility, fault pinpointing, and integration into energy management systems.
LS RMU Series is available in a selection of model families tailored to typical use cases. Each model family supports specific voltage classes, current ratings, and insulation configurations. For project-specific technical requirements, Polar Energy provides a model selection service and full datasheets.
Contact Polar Energy for a tailored selection guide and model codes.
This section highlights the technical elements buyers ask about, with an emphasis on what impacts project cost, schedule, and safety.
Robust sheet steel or stainless enclosures, with thermal and corrosion protection options. Internal compartmentalization isolates live compartments from cable and control areas, supporting safe access for maintenance.
Where high dielectric performance is required, sealed gas insulation variants deliver compactness with reliable dielectric strength; vacuum interrupter options remove reliance on gas handling and simplify lifecycle management.
The RMU Series supports modern numeric protection relays, bay controllers, and metering modules. Integration options include local HMI panels, remote SCADA gateways, and full IEC 61850 station bus implementations for centralized control and automation.
Designed with visible earthing provisions, positive isolation mechanics, and interlocks that prevent unsafe switching sequences. Earthing switches and grounding indicators are accessible from service positions, reducing lockout time.
Optional current and voltage transducers, temperature sensors, and gas pressure monitoring feed a local controller, which can forward data to a SCADA or cloud analytics platform. IEC 61850 or Modbus TCP support is available for seamless integration.
LS RMU Series are designed to align with common international standards for medium voltage switchgear, including the IEC 62271 family and associated product standards. Equipment undergoes factory type testing and routine testing, with FAT options available. Polar Energy can provide test reports, type certificates, and performance verification as part of the procurement package.
LS RMU Series fits a wide set of distribution needs:
Polar Energy provides installation and commissioning services that prioritize HSE and project predictability. Basic site checklist: confirm foundation and earthing plans, pre-check cable routing and clearances, verify LOTO procedures, perform FAT and SAT, validate protection settings and communications, and conduct operator handover training. For hybrid or live grid connections, follow a documented PSSR before energization.
Polar Energy offers standard warranty packages, optional extended warranty, and stocked spares where project schedules require rapid replacement. On-site commissioning, FAT witness services, and service-level agreements with guaranteed response times are available. Contact Support for available service tiers and spare parts lead times.
LS RMU Series is optimized for compact, modular installations. If you need alternative architectures, Polar Energy can provide comparison matrices for vacuum switchgear, metal-clad switchgear, and GIS options, along with recommended protection relays, CTs, and SCADA gateways. Consider pairing RMUs with digital monitoring and predictive maintenance services to maximize uptime.
Ready to specify an RMU for your project? Download the full spec pack, or request a quote with your project voltage, feeder count, and preferred delivery window. Polar Energy offers pre-sales technical selection, FAT support, and site commissioning packages to keep schedules tight and HSE on target.
Request quote – Download spec pack – Contact sales
