RMSYS switchboards are used in MV secondary power distribution, public or private, with voltage, up to 24kV. Particularly they can be employed in power lines and transformers on ring networks. RMSYS switchboard (Ring Main Unit - RMU) is composed by a monoblock partitioned into integrated operating units. The stainless steel shell is absolutely sealed, and contains the switching device and all the live parts. The possible combinations of 3 position rotary switches (close, open, earthed) with vacuum circuit breakers or fuses assure to protect the outgoing circuits and/or transformers. Every operating unit contains a plug-in cable connection compartment. A relief valve ensures the safety in the event of overpressure inside the container, in accordance with the standards IEC 62271-1; the pressure is constantly monitored by a manometer placed on the front. The system is in keeping with the IEC Standards annex EE, relating to sealed pressure systems.


Voltage12 KV24 KV
Operating Voltage11 kV22 KV
Rated Frequency50/60 Hz
Rated Power Frequency Withstand Voltage Ud28 kV50 KV
Rated Lightning Impulse Withstand Voltage Up75125 kv
Bus Bar MaterialElectrolytic copper
Rated Current630 A
Rated Short-circuit Breaking Current (ISC)20 KA
Rated Peak Withstand Current (Ip)62.5 kA
Rated Duration of Short Circuit Current (TK)3 s
Degree of ProtectionIP 67
Ambient Temperature45° C
Standard ColorRAL7035
Internal ACR Testing Current20 KA ,1 sec

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