HV Switchgear
SRM-12C/630-25 Gas-insulated Ring Main Unit
12kV fully insulated, fully sealed SF6 ring main unit with 630A / 25kA rating.
SRM-12C is a fully insulated and fully sealed gas-insulated ring main unit (RMU) for 12kV / 6.3kV distribution. All live parts and switches are enclosed in a 3mm stainless-steel welded tank with silicone-rubber cable plugs, making it suitable for humid, polluted or space-tight environments.
Key Technical Parameters
| Rated voltage | 12 kV (also 6.3 kV) |
|---|---|
| Rated frequency | 50 Hz |
| Rated current | 630 A |
| Rated breaking current | 25 kA |
| Gas tank | 3 mm stainless steel, welded, fully sealed |
| Cable plug | silicone-rubber, fully insulated |
| Operation | spring-energy-stored mechanism, manual / motor |
| Standards | IEC 62271-200, GB/T 3906-2020 |
Structure & Features
- Modular units: fixed combination and extensible types, bayed left/right or front/back.
- SF6 pressure monitoring window; design life over 30 years under 20°C indoor condition.
Application Scenarios
- Cable distribution rings, compact and underground substations, humid or polluted areas.
Model Designation & Variants
- SRM = sealed RMU; 12 = voltage class; 630 = rated current; 25 = breaking current.