HomeLightning & Surges ProtectionElectronic Systems Protection › Furse ESP TN/JP, TN/RJ11 and ISDN/RJ45 Series

Furse ESP TN/JP, TN/RJ11 and ISDN/RJ45 Series

Combined Category D, C, B tested protector (to BS EN 61643-21) suitable to protect telephony equipment plugged into a BT telephone (BS 6312), Modem (RJ11) or ISDN (RJ45) socket.

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
  Full mode design capable of handling partial lightning currents as well as allowing continual operation of protected equipment
  Repeated protection in lightning intense environments
  Supplied in a sturdy ABS housing ready for flat mounting, or vertically via TS35 'Top Hat' DIN rail
  Substantial earth connection to enable effective earthing
  ESP TN/JP, ESP TN/RJ11-2/6, ESP TN/RJ11-4/6 and ESP TN/RJ11-6/6 are suitable for telecommunication applications in accordance with Telcordia and ANSI Standards (see Application Note AN005)


  ESP TN/RJ11-2/6
  ESP TN/RJ11-4/6
  ESP TN/RJ11-6/6
  ESP ISDN/RJ45-4/8
  ESP ISDN/RJ45-8/8

Data Sheet


  For PSTN (e.g. POTS, dial-up, lease line, T1/E1, *DSL and Broadband) use ESP TN/JP or TN/RJ11
  ESP TN/JP and ESP TN/RJ11… are suitable for use on telephone lines with a maximum (or ringing) voltage of up to 296 volts
  For telephone lines with a British style, jack plug and socket connection, use ESP TN/JP
  For telephone lines with RJ11 connections protect the middle 2 (of 6) conductors with ESP TN/RJ11-2/6, the middle 4 (of 6) with ESP TN/RJ11-4/6 or all 6 with ESP TN/RJ11-6/6
  For S/T interface ISDN lines, use ESP ISDN/RJ45-4/8 and ESP ISDN/RJ45-8/8
  For S/T interface ISDN lines with RJ45 connections protect the middle 4 (of 8) conductors (paired 3&6, 4&5) with ESP ISDN/RJ45-4/8, or all 8 (outside pairs 1&2, 7&8) with ESP ISDN/RJ45-8/8


Connect in series with the telephone or ISDN line. These units are usually installed close to the equipment being protected and within a short distance of a good electrical earth.

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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