ABB Furse ESP 240T1/25/TNS Surge Protector

Code: 7TCA085400R0499
  • Compact, space-saving design
  • Repeated protection in lightning-intense environments
  • Standard: IEC 61643-11

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The ESP 240T1/25/TNS is a Combined Type 1 and 2 tested Surge Protective Device SPD (to BS EN 61643) for use on the main distribution board, particularly where a structural Lightning Protection System (LPS) is employed, for equipotential bonding.

For use at boundaries up to LPZ 0 to protect against flashover (typically the main distribution board location) through to LPZ 2 to protect electrical equipment from damage.

Features & Benefits

  • Enhanced protection (to IEC/BS EN 62305) offering low let-through voltage further minimizing the risk of flashover creating dangerous sparking or electric shock.
  • Pluggable module design (with anti-vibration locking clip) allows for simple replacement at end-of-life.
  • An indicator shows when the SPD protection modules require replacement.
  • Remote signal contact can indicate the protector’s status through interfacing with a building management system.


  • Use on single-phase mains supplies and power distribution systems for protection against partial direct or indirect lightning strikes.
  • ESP 240T1/25/XXX versions for use with Class I or II Lightning Protection Systems LPS where there are multiple metallic services to the building or on exposed overhead single-phase power lines where no LPS is fitted.
  • ESP 240T1/12.5/XXX versions for use with Class III or IV LPS or where the LPS and service line information is unknown and so SPD impulse current Iimp cannot be calculated (minimum 12.5kA Iimp required).
  • ESP 240T1/X/TNS versions also cover TN-C-S earthing systems.


The SPD is to be installed in the main distribution board with connecting leads of minimal length. The protector should be fused and is suitable for attachment to a 35 mm top hat DIN rail. The diagrams below illustrate how to wire the appropriate ESP protector according to your chosen electrical system.


  • Type of Low Voltage Distribution System: TN-S
  • Suitable For: To protect systems against transient overvoltages or surges from lightning and electrical switching events
  • Nominal AC Voltage of the System (Uo): 230 V
  • Voltage Protection Level ( Up): 1.5 kV
  • Maximum Continuous Operating Voltage (Uc): 275 V
  • Temporary Overvoltage Test Value (UT): 337 V
  • Discharge Current: Nominal 25 kA / Maximum 65 kA
  • Short Circuit Withstand Icc: 50 kA
  • Rated Frequency (f): 50 / 60 Hz
  • Short-Circuit Protective Devices: ≤ 315 A
  • Arrester Class: I / II
  • Number of Protected Poles: 2
  • Connection Type: Screw Clamp
  • Auxiliary Circuit Load: 250Vac – 1A
  • Remote Indicator: Yes
  • Wire Stripping Length: 18 mm
  • CN8: 8536308000

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Title Size
ESP 240T1/25/TNS Datasheet 642 KB

Additional information

Weight 0.09 kg