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  • Series
  • Model
  • Brand / Made in
  • RF coaxial surge protector DC-3.5 GHz
  • Power: 190 W
  • Connectors: N
  • Technology: Gas discharge tube (removable)
  • Max. discharge current: 20 kA
  • Low insertion loss
  • DC-pass
  • Bi-directional protection
  • Standards compliance: IEC 61643-21 / EN 61643-21 / UL497C / UL497E

P8AX series (Gas Tube Protection)

The gas discharge tube (GDT) is the only surge protection component usable on very high frequency transmission (several GHz) due to its very low capacitance. In a coaxial surge protector, the GDT is connected in parallel between the central conductor and the external shield. When its sparkover voltage is reached, during an overvoltage event, the line is briefly shorted (arc voltage).

The sparkover voltage depends on the rise front of the overvoltage. The higher the dV/dt of the overvoltage, the higher the sparkover voltage of the surge protector is.

When the overvoltage disappears, the gas discharge tube returns to its original condition of high isolation and is ready to operate again. The gas tube is removable, making maintenance rapid in the end-oflife scenario (short-circuit).


  • Description: RF coaxial protector - 3.5 GHz
  • Technology: Gas discharge tube
  • Frequency range f: DC-3.5GHz
  • Max Power P: 190 W
  • Impedance Z: 50/75 ohms
  • Insertion loss: < 0.2dB
  • Return loss: > 20 dB
  • VSWR: < 1.2:1
  • Max. Load current IL: 10A
  • Nominal discharge current In: 5 kA
  • Max. discharge current Imax: 20 kA
  • Impulse current Iimp: 2.5 kA
  • Protection level Up: < 800 V
  • Typical let through energy: 350 μJ
  • End of life behavior: Short-circuit (fault mode 2 - Transmission interruption)


  • Dimensions: see diagram
  • Connection to Network: Connector N Female/Female
  • Disconnection indicator: transmission interrupt
  • Mounting: Feedthrough
  • Operating temperature: -40/+85°C
  • Protection rating: IP66
  • Housing material: Brass/Surface plating: Cu Zn Sn
  • Contacts: Bronze/Surface plating: Au or Ag
  • Insulation material: PTFE


  • Standards compliance: IEC 61643-21 / EN 61643-21 / UL497C / UL497E
  • RohS compliance: yes


The efficiency of coaxial protectors is highly dependent on proper installation, in particular their connection to the earthing network of the installation.
The following installations rules must be strictly observed to ensure the efficiency:

  • Equipotential bonding network: all the bonding conductors of the installation must be interconnected and connected to the installation earthing network.
  • Optimized connection of the protector to the bonding network: to reduce the residual voltages during lightning discharge currents, the connection of the protector to the bonding network must be as short as possible (less than 50 cm) and has a proper cross section (at least 4 mm²).

The «feedthrough mounting» versions perfectly meet all these requirements.
Warning: Carefully remove all paintings or insulating coatings to ensure good contact..

  • Location of the protectors: they should preferably be placed at the entrance of the installation (to limit the penetration of lightning currents) and also near sensitive equipment (to enhance protection).




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