Outdoor Ring Main Unit
Key attributes
| Brand | ABB |
| Model NO. | Outdoor Ring Main Unit |
| Rated voltage | 12kV |
| Rated normal current | 630A |
| Rated short-time withstand current | 20kA |
| Series | SafeLink CB |
Product descriptions from the supplier
The SafeLink CB is an outdoor RMU ideally suited for rural and urban distribution applications up to 13,8kV. The product is unique in terms of number of features and value it offers, making it the ideal choice for various applications in, for example, utility distribution networks, hotels, shopping centers, office buildings, airports, hospitals, tunnels and underground railways.
Product scope
Rated voltage: 12 and 13,8kV
Rated current: 630A
Rated short time current: 21 kA for 3 sec
Key benefits
Optimized safety with no exposure to live parts and built-in safety interlocks
Compact and robust design
Reliable and minimal maintenance
Fast and easy to install
Solutions including applications for remote control and monitoring
Fully extensible on both sides with option of adding standalone vacuum circuit breakers or ring switches
Key features
Internal arc classified as per latest IEC, fully type tested in STL certified test labs
Vacuum circuit breaker with high mechanical endurance
Maintenance free and complete safety for user and pedestrian with no exposure to live parts
All in built mandatory safety interlocks provided to ensure operator safety
Complete solutions including applications for remote control and monitoring
Recyclable and very low environmental impact
Application Scenario
1: Branch Power Supply for Urban and Rural Medium-Voltage Distribution Networks
Suitable for branch line power supply in 12/13.8kV urban and rural distribution networks, covering scenarios such as residential areas, commercial streets, and township markets. Its compact and robust design is suitable for limited installation spaces. The absence of exposed live parts plus safety interlocks ensure the safety of pedestrians, operation, and maintenance personnel. The low-maintenance feature reduces the operational costs of the power grid.
2: Power Distribution in Commercial Complexes and Public Facilities
Suitable for internal power distribution systems in commercial and public buildings such as hotels, shopping malls, hospitals, and office buildings. It supports remote monitoring and control, meets the 24-hour stable power supply demand of buildings, its quick installation feature adapts to the construction and decoration schedule, and the zero exposed live parts ensure safety in crowded scenarios.
3: Supporting Power Supply for Transportation Infrastructure
Used in medium-voltage power distribution links of airport terminals, urban tunnels, and subways. It complies with IEC internal arc standards, has strong weather resistance and low environmental impact. It can adapt to the expansion needs of transportation facilities through expansion modules, and the remote operation and maintenance function reduces on-site operation interference in transportation hubs.
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Related Knowledges
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Protection Logic Improvement and Engineering Application of Grounding Transformers in Rail Transit Power Supply Systems1. System Configuration and Operating ConditionsThe main transformers at Zhengzhou Rail Transit’s Convention & Exhibition Center Main Substation and Municipal Stadium Main Substation adopt a star/delta winding connection with a non-grounded neutral point operation mode. On the 35 kV bus side, a Zigzag grounding transformer is used, connected to ground through a low-value resistor, and also supplies station service loads. When a single-phase ground short-circuit fault occurs on a line, a pathEcho12/04/2025
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