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Surge arrester MWD

Silicone-housed surge arrester of IEC class station low (SL) for AC systems up to 52 kV for indoor use

MWD is a shedless surge arrester with metal-oxide (MO) resistors without spark gaps directly molded in silicone housing, grey color, designed and tested according to IEC 60099-4; and it fulfills the requirement of ANSI/IEEE C62.11. Fire and smoke behavior tested and classified according to EN 45545-2.

It is used for secure protection of medium voltage systems against overvoltages from atmospheric discharges and switching conditions. The product is suitable for indoor installation only.

  • Medium-voltage dry type transformer
  • Air-insulated medium-voltage switchgear and panel
  • Medium size generator
  • Medium-voltage cable and cable termination
  • Medium-voltage motor
  • Other medium-voltage distribution equipment
Why Hitachi Energy?
  • Over 100 years of experience in overvoltage protection and more than 30 years with silicone insulation
  • Local and global Hitachi Energy application support
  • Proven safe short-circuit current design
  • Design life of more than 30 years
  • Own production of metal-oxide (MO) resistors
  • Excellent protection level with low residual voltage
  • Maintenance free

Brief performance data

Maximum system voltage (Us) kV 52
Continuous voltage through arrester (Uc) kVrms 4-44
Rated voltage of arrester (Ur) kVrms 5-55
Nominal discharge current (In) kApeak 10
Thermal energy rating (Wth) kJ/kV (Ur) 5.0


For more details see the data sheet in downloads below.

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