Ring Main Unit
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.
In case a circuit breaker is the switching device, it is also equipped with protective relaying, either with a very basic self-powered type or a more advanced one with communication capabilities.
The rated voltage and current ranges for RMUs typically reach up to 24 kV and 630 A respectively. With many of the manufacturers of RMUs, the basic construction of the unit remains the same for the whole of the voltage range.
| Rated Voltage | 11 KV/ 33 KV |
| Degree Of Protection | IP 54 |
| Rated Current | 630A/1250A |
| No. Of Poles | 3 |
| Brand | ABB / Schneider / Siemens |
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