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Surge arrester POLIM-H..SD

Silicone-housed surge arrester for DC traction system up to 3 kV with class DC-B

POLIM-H..SD 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-H..SD 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 arresters also meet the requirements for A1/A2 functions according to the VDV 525 recommendation:

  • A1 – overvoltage protection of equipment connected to traction supply voltage
  • A2 – overvoltage protection for apparatus connected to the running rails


  • Traction systems – fixed installations
  • 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 current design
  • Design life of more than 30 years
  • Own production of metal-oxide (MO) resistors
  • High energy withstand handling capability
  • Mechanically strong design
  • UV resistant  silicone housing with excellent pollution performance
  • Maintenance free
  • Stable against shock and vibration

Brief performance data

DC class   DC-B
Continuous voltage through arrester (Uc=Ur) kV DC 0.14-4.2
Short-circuit current (Is) kA DC 40
Charge transfer capability (Qt) As 2.5
Thermal energy rating (Wth) kJ/kV (Ur) 9.5


For more details see the data sheet in downloads below.

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