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Furse ESP SL LED 4-20 mA Series

Combined Category D, C, B tested protector (to BS EN 61643-21) suitable for twisted pair 4-20 mA loop systems with innovative LED protector status indication. 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 (e.g. transmitters, monitors, controllers).

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
  Innovative LED indication of protection status provides easy visual checking and quick maintenance
  Ultra slim 7 mm width ideal for compact protection of large numbers of lines (e.g process control installations)
  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
  High (75 mA) maximum running current - can also be used on 10-50 mA systems (e.g process control)
  Screen terminal enables easy connection of cable screen to earth
  Strong, flame retardant, polycarbonate housing
  Built-in innovative DIN rail foot with locking feature for simple positioning and clip-on mounting to top hat DIN rails
  4 mm2 terminals allow for larger cross section wiring, stranded wires terminated with ferrules or fitting two wires into a single terminal
  Convenient earthing through DIN foot and/or earth terminal

Data Sheet


Use these protectors on 4-20 mA loop systems - ideal where installation space is at a premium and large numbers of lines require protection, or for systems with long signal lines.


Connect in series with the 4-20 mA current loop either near where it enters or leaves the building or close to the equipment being protected (e.g. within its control panel). Either way, it must be very close to the system's earth star point.

Install protectors either within an existing cabinet/cubicle or in a separate enclosure.


  ESP SL30L/4-20

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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