Ring Main Unit (RMU)

A Ring Main Unit (RMU) is a totally sealed, gas-insulated compact switchgear unit. The primary switching devices can be either switch disconnectors or fused switch disconnectors or circuit breakers.

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Detailed Description for Ring Main Unit (RMU)

Ring Main Unit is a kind of smart, environmentally friendly power distribution equipment developed by GALAXY SWITCH independently. It has a brand new structure, high performance under all conditions, no internal arc, compact design, safe, environmentally friendly, maintenance free, etc.




Ring main unit is used in a secondary distribution system. It is basically used for an uninterrupted power supply. Alongside, it also protects your secondary side transformer from the occasional transient currents. Depending on your applications and loading conditons you can use a swicth fuse combination or a circuit breaker to protect the transformer. This transformer connected to the switch fuse/ circuit breaker is called your T off. In a common arrangement you have Load break swicthes on both the sides of your T off.



Separate-phase modular design

Outer surface of poles painted semi-conductive layer and earthed

Pressure relief port on insulating box(switching compartment)

Fully solid insulated and sealed design

Unique internal structure design

Complete application solution, free combination

Smart application

High altitude application


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