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Medium Voltage Secondary RMU

Magnefix

Magnefix switchgear is a fully epoxy resin insulated ring main unit for up  to 15 kV distribution networks. The compact construction and fully insulated design make Magnefix ideal for installation in transformer stations, high rise buildings and wind turbine connections.

MD4 up to 12 kV, MDF up to 15 kV

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Rated voltage
up to 15 kV
Rated normal current
up to 450 A
Degree of protection
IP 2X

Core features

  • Extremely compact (91 mm per switch panel)
  • Safe and reliable
  • Flexible design, high level of modularity
  • User friendly
  • Environmental friendly (SF₆-free)
  • Cost effective

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SF₆-free for more than 50 years

Magnefix was first introduced to the market in 1955. Since then more than 200,000 Magnefix switchboards have been shipped to satisfied customers across the globe. The smart design, safe and robust construction and easy operation make Magnefix "timeless". Magnefix users can count on maximum support and the associated service.
Picture courtesy of Holec Historical Society (Holec Historisch Genootschap)

Magnefix MD4

Magnefix MDF

Sustainability is in our DNA

Magnefix uses air and epoxy resin for insulation instead of SF₆. This eliminates the risk of leakage and minimizes maintenance costs as well as expensive end-of-life disposal procedures due to all materials being re-usable or recyclable. Eaton has been pioneering SF₆-free medium voltage systems for more than 60 years, with over a million SF₆-free switchgear panels installed across the globe.
Learn more about Eaton's 2030 sustainability targets
Find out more about our SF₆-free switchgear
Specifications

Technical information

eaton-magnefix-dimensional-drawings-w.JPG
  Magnefix type MD4 Magnefix type MF
Cable unit 91 mm 105 mm
Busbar connection unit 91 mm 105 mm
Cable unit for top connection 91 mm 210 mm
Blind connection block 91 mm -
Busbar sectionaliser 182 mm 210 mm
Fuse protection tee-off 230 mm 244 mm
Circuit-breaker protection tee-off 230 mm -
Total width calculations B = C x 91 + T x 230 + 72 B = C x 105 + T x 244 + 72
(C= number of cable units, T = number of protected tee-offs)
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General

Magnefix type MD4 | Magnefix type MF
Rated voltage kV 3.6 7.2 12 | 3.6 7.2 12 15
Impulse withstand voltage kV 40/46 60/70 75/85 | 40/46 60/70 75/85 95/110
Power frequency withstand voltage kV 10/12 20/23 28/32 | 10/12 20/23 28/32 38/45
Frequency Hz 50-60 50-60 50-60 | 50-60 50-60 50-60 50-60
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Busbar system

Magnefix type MD4 | Magnefix type MF
Normal current A 400 400 400 | 630 630 630 630
Short-time withstand current kV - 1s 14.4 14.4 14.4 | 20 20 20 20
Peak withstand current kV 31 31 31 | 50 50 50 50
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Switch-disconnector

Magnefix type MD4 | Magnefix type MF
Normal current A 400 400 400 | 450 450 450 450
Mainly active load breaking current A 400 400 400 | 450 450 450 450
Short-circuit making current peak value kA 31 31 31 | 50 50 50 50
Short-time withstand current kV - 1s 14.4 14.4 14.4 | 20 20 20 20
Earth fault breaking current A 240 240 240 | 240 240 240 240
Cable charging breaking current A 25 25 25 | 25 25 25 25
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Circuit breaker

Magnefix type MD4
Normal current A 400 400 400
Short-time withstand current kA - 1s 14.4 14.4 14.4
Short-circuit breaking peak current kA 14.4 14.4 14.4
DC component % 20 20 20
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Fuse-links

Magnefix type MD4 | Magnefix type MF
Normal current A 57.7 57.7 57.7 | 57.7 57.7 57.7 57.7
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Standards and regulations

Magnefix medium voltage switchgear complies with the most recent IEC regulations:

  • IEC 62271-1 for high-voltage switchgear
  • IEC 62271-100 for the circuit-breakers
  • IEC 62271-102 for the change-over switches and earthing switches
  • IEC 62271-103 for high voltage switches
  • IEC 6227-201 for A.C. insulation-enclosed switchgear and controlgear
  • IEC 60529 for degrees of protection (IP code)
  • IEC 60044-1 for current transformers
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Magnefix medium voltage switchgear is certified for the following compliances:

  • KEMA
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Magnefix production facilities comply with the following standards:

  • ISO 9001 for quality management
  • ISO 14001 for environmental management
  • ISO 50001 for energy management
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Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.
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