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Surge arrester POLIM-C..LB

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

POLIM-C..LB 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 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.


  • Low-voltage motors
  • High-voltage cable sheath (cable sheath linkbox)

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 2.3-4.8
Rated voltage of arrester (Ur) kVrms 2.88-6.0
Nominal discharge current (In) kApeak 10
Thermal energy rating (Wth) kJ/kV (Ur) 4.4


For more details see the data sheet in downloads below.

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