The 12kV Solid Insulated Ring Main Unit (RMU) Three-Phase is a compact medium voltage ring main unit for secondary distribution networks, compact substations and renewable collection systems. Ring feed, radial feed and transformer protection arrangements are available as shown in the technical parameters below.
Insulation type, number of ways, switching scheme and automation interface are specified per project. Units are routine-tested before dispatch, and motorised operation, indicating lamps and fault passage indication can be added where your network management approach calls for them.
Technical Parameters & Ratings
| Rated Voltage | 12 kV |
|---|---|
| Frequency | 50 Hz / 60 Hz |
| Phase | Three Phase |
| Structure Type | Ring main unit (RMU) |
| Insulation Type | Solid insulation |
| Standard | IEC / GB / customized project specification |
| Installation | Indoor / outdoor according to enclosure design |
| Application | Distribution substations / industrial plants / building electrical systems |
Technical Highlights
- This product combines structured cabinet design, practical electrical coordination, and project-specific configuration flexibility. It is suitable for power systems that need reliable switching or control performance, organized maintenance access, and scalable options for monitoring, communication, and protection.
Application Scenarios
- Utility feeder control systems
- Substations and transformer stations
- Industrial plants and process power systems
- Urban distribution networks
- Renewable power distribution and collector systems
Key Features
- Compact RMU structure for ring network distribution and feeder sectionalizing
- Available in SF6, solid-insulated, or customized insulation architecture according to model
- Suitable for urban distribution, renewable feeder interface, and compact substation integration
- Project-oriented switching arrangement, protection options, and automation interfaces available
- Space-efficient design for indoor or kiosk-based deployment
- Supports export documentation and project-based configuration control
Optional Configurations
- Rated current and short-time withstand current
- Protection relay brand and function package
- Incoming/outgoing feeder arrangement
- Automation and communication interface
- Cabinet dimensions, finish, and busbar layout
- Accessory package and interlock scheme
- Color, nameplate language, and document package
- Ambient temperature, altitude, and installation condition adaptation
Frequently Asked Questions
What is a ring main unit used for?
An RMU provides compact medium voltage switching for secondary distribution networks. It is used where space is tight and maintenance access is limited: compact substations, urban distribution and renewable collection networks.
SF6 or solid insulated – which should I choose?
SF6 insulated units are the established option with a long service record. Solid insulated units avoid SF6 entirely where your project has environmental or reporting constraints. We supply both and will advise against your requirements.
Can it be configured for ring or radial feed?
Yes. Configurations for ring feed, radial feed and transformer protection are available at 12kV, 24kV and 33kV. Confirm your network topology when enquiring.
Which standards does it comply with?
RMUs are designed to IEC 62271-200 (and IEC 62271-100 for the switching device) plus the GB equivalent. Confirm the applicable clauses for your market before ordering.
What do you need to provide a quotation?
System voltage, number of ways, ring or radial configuration, transformer protection requirement, insulation preference and quantity.
Typical Applications
The 12kV Solid Insulated Ring Main Unit (RMU) Three-Phase is specified in projects such as:
- Ring and radial secondary distribution networks
- Compact substation transformer protection (T-off ways)
- Urban distribution and building intake substations
- Renewable collection and feeder sectionalising points
- Industrial plant MV intake with limited space
Manufacturing & Factory Testing
Switchgear and panel assembly at our works, with quality control checkpoints through production and complete routine testing before dispatch:
- Sheet metal fabrication, busbar fabrication and harness wiring in-house
- Mechanical operation and interlock verification on every assembly
- Routine tests: insulation resistance, power-frequency withstand, functional checks and wiring verification
- Type test reports for the assembly design available on request
Technical Drawing
Delivery, Warranty & OEM Support
- Typical lead time: 30 days from order confirmation for standard ratings; custom configurations are confirmed at order stage
- Warranty: 2 years, with technical support available throughout the service life
- OEM / ODM supported: private labelling, nameplate language and document packages
- Seaworthy export packing; documentation set includes routine test reports, installation manuals and general arrangement drawings
Need a quotation for the 12kV Solid Insulated Ring Main Unit (RMU) Three-Phase? Send your single line diagram and ratings to our sales team and our engineers will confirm the configuration, lead time and price.
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