Overview
Engineered for secondary distribution networks, the RM6-12 is a fully sealed ring main unit (RMU) that delivers maintenance-free switching and protection for over 30 years. Its rugged IP67 stainless steel tank encloses all live parts within SF6 gas, making the unit immune to moisture, dust, and corrosion.
The RMU is available in three configurations — C (load break switch), F (fuse-switch) and V (vacuum circuit breaker) — and adapts to urban grids, industrial sites, commercial buildings and renewable projects. It is fully type-tested and certified to IEC 62271-200 and GB3906 standards.
Key Features
- Fully sealed SF6 gas insulation — ensures stable dielectric performance in all environmental conditions.
- IP67-rated 3mm stainless steel tank — provides complete protection against moisture, dust, and corrosion.
- 30-year maintenance-free service life — drastically reduces total cost of ownership.
- Three configurable variants — C-type load break switch, F-type fuse-switch combination, and V-type vacuum circuit breaker.
- Compact footprint — enables easy installation in underground vaults, compact substations, and space-constrained sites.
- Fully type-tested and certified — to IEC 62271-200 and GB3906 standards.
- Proven reliability — across urban grids, industrial parks, commercial centers, and renewable energy projects.
- No special ventilation or cooling required — because the SF6 insulation is fully sealed.
Technical Specifications
| Item | C Module / F Module / V Module |
|---|---|
| Rated voltage (kV) | 12 / 12 / 12 |
| Rated frequency (Hz) | 50 / 50 / 50 |
| Rated current (A) | 630 / 630 / 1250, 630 |
| Insulating gas | SF6 / SF6 / SF6 |
| Rated closed-loop breaking current (A) | 630 / 630 / — |
| Rated cable charging breaking current (A) | 10 / 10 / — |
| Rated short-circuit breaking current (A) | — / 50 / 80 |
| Mechanical life (cycles) | 5,000 / 5,000 / 5,000 |
| Main switch (cycles) | 10,000 / 10,000 / 10,000 |
| Tank | IP67, 3 mm stainless steel |
Applications
- Urban power distribution networks and underground ring grids.
- Commercial complexes, high-rise buildings, and shopping centers.
- Industrial parks, manufacturing facilities, and mining operations.
- Renewable energy projects including solar farms and wind power plants.
- Data centers and critical infrastructure requiring high-reliability power supply.
- Prefabricated substations and compact secondary distribution stations.
- Infrastructure projects such as airports, railways, and hospitals.
Installation Conditions
- Indoor installation is recommended; the unit is suitable for confined spaces such as cable vaults and basements.
- Ambient temperature range of -25°C to +55°C supports reliable operation across diverse climates.
- The IP67 protection rating permits installation in dusty, humid, or temporarily flooded environments.
- The compact modular design allows flexible arrangement and easy integration into existing switchgear rooms.
- No special ventilation or cooling systems are required due to the sealed SF6 insulation.
- Floor-standing mounting with a front-access design simplifies installation and future expansion.
- Suitable for both ring and radial network topologies without additional system modifications.
How to Select
- Which module type suits the circuit — C for load break switching, F for fuse-switch combination, or V for vacuum circuit breaker protection.
- The rated current required: 630 A for C and F modules, or 1250/630 A for the V module.
- The short-circuit breaking duty, up to 50 A for the F module and up to 80 A for the V module.
- Whether the network topology is ring or radial.
- The available floor space and whether front access is required.
- The ambient temperature and any risk of dust, humidity or temporary flooding.
FAQ
What module configurations are available for the RM6-12?
Three: the C module with a load break switch, the F module with a fuse-switch combination, and the V module with a vacuum circuit breaker.
What insulation and tank design does the RMU use?
It uses fully sealed SF6 gas insulation, with all live parts enclosed in an IP67-rated 3mm stainless steel tank that is immune to moisture, dust and corrosion.
How long is the RMU maintenance-free?
The design provides a 30-year maintenance-free service life, which drastically reduces the total cost of ownership.
What are the breaking ratings of the F and V modules?
The F module has a rated short-circuit breaking current of 50A, and the V module has a rated short-circuit breaking current of 80A. The C and F modules both have a rated closed-loop breaking current of 630A and a cable charging breaking current of 10A.
What is the mechanical life of the RMU?
Mechanical life is 5,000 cycles across all three modules, with a main switch life of 10,000 cycles.
Which standards is the RM6-12 certified to?
It is fully type-tested and certified to IEC 62271-200 and GB3906 standards.
What ambient conditions can the RMU operate in?
It operates across an ambient temperature range of -25°C to +55°C, and the IP67 rating permits installation in dusty, humid, or temporarily flooded environments.
Does the RMU need ventilation or cooling?
No. No special ventilation or cooling systems are required because the SF6 insulation is fully sealed.
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