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The HE75CXR surge suppressor is a multi-stage, solid-state product designed to suppress the differential voltage impulses between the inner and outer conductors of an RF transmission line associated with natural electrical charges that exceed the device turn-on voltage. When properly installed outside to a low resistance ground, as per EIA RS 222C standard, the HE75CXR will provide a conductive path to the grounding system for said voltages up to the rated current-handling capability. The HE75CXR may be ordered with BNC connectors for CCTV, Data and Audio applications or the popular ‘F’ type female connectors which make the suppressor compatible with CATV installations. Other connectors are available on request at a nominal charge.

Internally, the HE75CXR utilizes a single element gas discharge tube. This tube is highly recognized as the ‘CADILLAC’ of gas tube arrestors. When an over-voltage condition is present, the gas tube appears as a short circuit. When the voltage surge is dissipated, the gas tube returns to its normal high impedance state automatically. Overvoltage transients are also addressed via silicone avalanche diodes. PTCs (resettable fuses) are also utilized within the protection scheme.

The transmission line is only one means of having impulses enter your equipment. We strongly recommend that power line protection also be installed.

Be sure to follow good grounding practices to include minimum bends and large bending radii. Make sure all grounds are tied together.

Download Specifications Sheet (PDF}


Peak Surge Current 8 x 20us 20KA
Surge Voltage 90 VDC Nominal
Clamp Voltage Selectable
Response Time <1ns
Energy 500 Joules
Insertion Loss <1dB @ 6 MHz
Impedance 50 or 75 Ohms
Frequency up to 200MHz
Connectors Type ..F.. or ..BNC..
Protection Scheme Line to Ground
Temperature -40°C to +85°C
Humidity 0-95% Non-condensing
Mounting Ground Stud (#10) or Aluminum Mounting Plate



  • Made In America
  • Utilizes “BNC” Type Connectors
  • Weatherproof
  • EMI/RFI Shielded
  • Selectable Clamp Voltage
  • Din Rail Mount Available