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Furse ESP ThinNet and ThickNet Series

Combined Category D, C, B tested protector (to BS EN 61643-21) suitable for use on Thick & Thin Ethernet cables that travel between buildings to prevent damage to equipment, e.g. transceivers, servers & repeaters. For use at boundaries up to LPZ 0B to protect against flashover (typically the service entrance location) through to LPZ 3 to protect sensitive electronic equipment.

Features and Benefits

  Very low let-through voltage (enhanced protection to BS EN 62305) between all lines - Full Mode protection
  Very low reflection coefficient/VSWR
  High bandwidth prevents degradation of high frequency signals
  Low in-line resistance to minimise unnecessary reductions in signal strength and maximise signalling distance


Connect in-line with the Ethernet cable near to where it enters and leaves the building or close to the equipment being protected.

Ideally, close to the system's earth star point (for a good connection to earth).

Note: allowing for one protector at each end, ESP ThinNet can be installed on segment lengths of up to 148 metres and ESP ThickNet can be used on segment lengths of up to 400 metres.

Data Sheet


For Thin Ethernet (Cheapernet, IEEE 802.3, 10 base 2) systems, use ESP ThinNet (BNC connectors).

For Thick Ethernet (IEEE 802.3, 10 base 5) systems, use ESP ThickNet (N connectors).


  ESP ThinNet
  ESP ThickNet

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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