High Reliability

  • Type testing of the MS-E was performed by an independent external testing and certification authority, KEMA, in the Netherlands.
  • MS-E is designed with the benefit of Mitsubishi's vast medium voltage panels production experience of hundreds of thousands of panels over the last almost 60 years.
  • All components, such as current transformers, voltage transformers and multi-function relays are made of the highest quality materials.
  • Heat stress analysis of the switchgear structure has led to a heat-resistant design in which circuit breakers up to 3150 A are self-cooled (i.e. cooling fans not required).
  • The reduced number of parts reduces the chance of failure.


  • Partitions between compartments and an automatic shutter system (for withdrawable equipment primary junctions) completely isolate live parts.
  • Safe operation and maintenance is ensured with the adoption of comprehensive interlocking mechanisms.
  • In the event of an internal arc fault, the MS-E is designed to withstand the huge pressure and burning effect of the arc. (Relief flaps located on top of the panel open to limit pressure.)
  • Withdrawable equipments are inserted / withdrawn whilst the front panel door is closed so that any arc proof rating is not compromised (in line with IEC 62271-200 requirements).

Easy Installation

  • Installation and testing duration are considerably reduced as the panel is tested and adjusted in the factory and then delivered as a complete unit.

Flexible Design

  • Panels with main circuit and control cable entry from either the top or bottom are available.


Standard IEC 62271-200
Rated voltage(kV) 7.2/12/15
Rated frequency(Hz) 50/60
Rated nominal current (A) 630, 1250, 2000, 3150, 4000* (4000A with force cooling)
 Rated power freq. voltage(kV) 20/28/36-1min
 Rated lightning impulse voltage(kV) 60/75/95
Rated short-time withstand current (kA) 25/31.5/40
Rated duration of short-time current (sec) 3
Internal Arc Classification AFLR 40kA/1sec
Dimension WxDxH[mm] (for 630A feeder) 800 x 1500 x 2600