RMU - Ring Main Units

SFA-RM units are designed to supply reliable energy and protect electrical equipment in secondary distribution networks up to 36 kV. SFA-RM units are the best solution for indoor/outdoor distribution substations as their compact design makes them suitable for various network applications such as transformer substations, wind power plants, renewable energy projects, industrial zones, etc. SFA-RM SF6 gas insulated units offer the following types :

1- alfa-R SF6 Free Ring Main Unit up to 24KV

Technical Specifications:

  • SF6 Free Ring Main Units with alfanar Dry Air Technology.
  • Rated voltage: up to 24 KV.
  • Normal current: 630 A
  • Short circuit withstand current: up to 21 kA for 1 Sec.
  • Degree of protection: IP41 for indoor / IP54 for outdoor
  • Internal Arc Classification: A-FLR 21kA/ 1s
  • Ambient temperature range: From -25oC to 55 oC.
  • Rated Frequency: 50/60 Hz.
  • Main busbar & switching compartment with IP67 protection degree rating


2- alfa-R SF6 Insulated Ring Main Unit up to 17.5KV

Technical Specifications:

  • Gas insulated Ring Main Units.
  • Rated voltage 17.5KV.
  • Normal current: 630 A.
  • Short circuit withstand current: up to 21 kA for 1 Sec.
  • Degree of protection: IP41 for indoor / IP54 for outdoor.
  • Internal Arc Classification: A-FLR 21kA/ 1s.
  • Ambient temperature range: From -25oC to 55 oC.
  • Rated Frequency: 50/60 Hz.
  • Main busbar & switching compartment with IP67 protection degree rating.


3- alfa-R SF6 Insulated Ring Main Unit up to 36KV

Technical Specifications:

  • Gas insulated Ring Main Units
  • Rated voltage 36KV
  • Normal current: 630 A
  • Short circuit withstand current: up to 25 kA for 1 Sec.
  • Degree of protection: IP41 for indoor / IP54 for outdoor
  • Internal Arc Classification: A-FLR 25kA/ 1s
  • Ambient temperature range: From -25oC to 55 oC.
  • Rated Frequency: 50/60 Hz.
  • Main busbar & switching compartment with IP67 protection degree rating.


4- alfa-R SF6 Insulated Smart Ring Main Unit up to 17.5 KV

Technical Specifications:

  • Gas insulated Smart Ring Main Units
  • Rated voltage 17.5 KV.
  • Normal current: 630 A
  • Short circuit withstand current: up to 21 kA for 1 Sec.
  • Degree of protection: IP41 for indoor / IP54 for outdoor.
  • Internal Arc Classification: A-FLR 21kA/ 1s
  • Ambient temperature range: From -25oC to 55 oC.
  • Rated Frequency: 50/60 Hz.
  • Main busbar & switching compartment with IP67 protection degree rating.


5- alfa-R SF6 Insulated Smart Ring Main Unit up to 36 KV

Technical Specifications:

  • Gas insulated Smart Ring Main Units
  • Rated voltage 36 KV.
  • Normal current: 630 A
  • Short circuit withstand current: up to 25 kA for 1 Sec.
  • Degree of protection: IP41 for indoor / IP54 for outdoor.
  • Internal Arc Classification: A-FLR 25kA/ 1s
  • Ambient temperature range: From -25oC to 55 oC.
  • Rated Frequency: 50/60 Hz.
  • Main busbar & switching compartment with IP67 protection degree rating.


6- alfa-R SF6 Insulated Compact Smart Ring Main Unit up to 17.5KV

Technical Specifications:

  • Gas insulated Compact Ring Main Units
  • Rated voltage 17.5
  • Normal current: 630 A
  • Short circuit withstand current: up to 21 kA for 1 Sec.
  • Degree of protection: IP41 for indoor / IP54 for outdoor.
  • Internal Arc Classification: A-FLR 21kA/ 1s
  • Ambient temperature range: From -25oC to 55 oC.
  • Rated Frequency: 50/60 Hz.
  • Main busbar & switching compartment with IP67 protection degree rating.