Brief Introduction 

Ring Main Units - switches can be freely assembled in a completely sealed tank filled with SF6 gas, which could be both manual and motor operation. FTU/RTU is operational. Up to 4 to 7 switches can be assembled. Load break switches, circuit breakers and fuse-switch combination can be freely assembled. Cables exit from front side or rear side of the device. Operating is controlled by spring mechanism; permanent electromagnetic protection is optional configuration. Circuit breaker can adopt self-powered micro-computing relay or normal micro-computing protection relay.

Technical Data

Rated voltage                                          12kV

Rated current                                          630A

Rated short-time withstand current          20kA,4s

Rated peak withstand current                  50kA

1 min power frequency withstand            42kV

Lightning impulse withstand voltage         110kV

Gas pressure                                          0.03MPa

Mechanical life                                       5000

Degree of protection                              IP67

Annual Leakage rate                              0.3‰

Technical Features

Stainless steel enclosure, filled with SF6 gas

Fully Shield and insulated,

Maintenance-free

Compressed-air load switch, high capacity and long life expectancy

Visible interrupting gap

Reliable interlocking