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Furse ESP RTD, RTDQ & SL RTD Series

Combined Category D, C, B tested protector (to BS EN 61643-21) suitable for 3 wire RTD systems to protect monitoring equipment. For use at boundaries up to LPZ 0A to protect against flashover (typically the service entrance location) through to LPZ 3 to protect sensitive electronic equipment.

Features and Benefits

  Protects all three wires on a 3-wire RTD system with a single protector
  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
  Low in-line resistance minimises reductions in signal strength
  Built-in DIN rail foot for simple mounting to top hat DIN rails
  Convenient earthing through DIN foot and/or earth terminal
  ESP RTD can be flat mounted on base or side
  ESP RTD and ESP RTDQ have colour coded terminals for quick and easy installation check
  ESP SL RTD has ultra slim 7 mm width ideal for compact protection of large numbers of lines (e.g. process control installations)
  ESP SL RTD includes two stage removable protection module with simple quick release mechanism allowing partial removal for easy line commissioning and maintenance as well as full removal for protection replacement

Data Sheet


For further information on RTD applications, see separate Application Note AN001.


Connect in series with the signal line either near where it enters or leaves the building or close to the equipment being protected ensuring it is very close to the systems earth star point. Screen connection should be made via the earth stud.



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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