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Surge arrester POLIM-H..-..

Silicone-housed surge arrester of IEC class station high (SH) for AC systems up to 72 kV

POLIM-H ..-.. is a 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 requirements of ANSI/IEEE C62.11. POLIM-H ..-.. complies also with the following standards:

  • Shock and vibration tested according to IEC 61373
  • Fire and smoke behaviour tested and classified according to EN 45545-2

This surge arrester is used for protection of medium voltage systems against overvoltages from atmospheric discharges and switching conditions.


  • Power transformer, medium-voltage terminal, star point
  • Arc furnace transformer
  • Large size power generator
  • Traction systems – fixed installations
  • Rolling stock and high-speed trains
  • Capacitors and capacitor banks, high capacity

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
  • High energy withstand capability
  • UV resistant silicone housing with excellent pollution performance
  • Maintenance free
  • Mechanically strong design
  • Stable against shock and vibration
  • High speed train tested

Brief performance data

Maximum system voltage (Us) kV 72
Continuous voltage through arrester (Uc) kVrms 4-44
Rated voltage of arrester (Ur)  kVrms 5-55
Short-circuit current (Is)  kArms 65
Nominal discharge current (In) kApeak 20
Repetitive charge transfer rating (Qrs) As (C) 2.8
Thermal energy rating (Wth) kJ/kV (Ur) 12
Specified short-term load (SSL) Nm 4000


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