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Surge arrester POLIM-K

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

POLIM-K is a surge arrester with metal-oxide (MO) resistors without spark gaps direct molded in silicone housing, grey color, designed and tested according to IEC 60099-4 and; it fulfills the requirement of ANSI/IEEE C62.11. POLIM-K also has other certifications:

  • Shock and vibration tested according to IEC 61373
  • 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.


  • Medium-voltage distribution transformer
  • Pole mounted medium-voltage transformer
  • Medium-voltage cable and cable termination
  • Air-insulated medium-voltage switchgear and panel

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
  • UV resistant  silicone housing with excellent pollution performance
  • Maintenance free
  • Stable against shock and vibration

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
Short-circuit current (Is) kArms 50
Nominal discharge current (In) kApeak 10
Thermal energy rating (Wth) kJ/kV (Ur) 4.5
Specified short-term load (SSL) Nm 250

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