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Surge arrester POLIM 4.5..ID

Silicone-housed surge arrester for DC traction system up to 3 kV with class DC-C for indoor use

POLIM 4.5..ID 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 62848-1 / EN 50526-1. POLIM 4.5..ID 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 DC traction systems against overvoltages from atmospheric discharges and switching conditions. The product is suitable for indoor installation only.


  • Rolling stock
  • Equipment in direct current installations

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 design
  • Design life of more than 30 years
  • Own production of metal-oxide (MO) resistors
  • High energy withstand handling capability
  • Mechanically strong design
  • Maintenance-free
  • Stable against shock and vibration

Brief performance data

    POLIM 4.5..ID
DC class   DC-C
Continuous voltage through arrester (Uc=Ur) kV DC 4.5
Charge transfer capability (Qt) As > 7.5 As
Energy withstand capability (Wth) kJ/kV (Ur) 45


For more details see the data sheet in downloads below.

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