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Furse ESP SL X Series

Combined Category D, C, B tested protector (to BS EN 61643-21) suitable for twisted pair signalling applications within hazardous environments (ATEX/IECEx approved). Available for working voltages of up to 15 and 30 Volts. For use at boundaries up to LPZ 0B to protect against flashover through to LPZ 3 to protect sensitive electronic equipment.

Features and Benefits

  Approved for use in hazardous environments for the protection of Intrinsically Safe circuits (Classification: II 2(1)G, Ex ia (ia Ga) IIC T4 Gb)
  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
  Ultra slim 7 mm width ideal for compact protection of large numbers of lines (e.g process control installations)
  Optional LED status indication versions available for low current DC power applications - add L suffix to part number - e.g ESP SL30XL
  Negligible self-capacitance and self-inductance offering minimal interference when protecting Intrinsically Safe circuits
  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 (750 mA) maximum running current
  High bandwidth enables higher frequency (high traffic or bit rate) data communications
  Screen terminal enables easy connection of cable screen to earth
  Suitable for earthed or isolated screen systems - add /I suffix to part number for versions that require isolated screens - e.g ESP SL30X/I
  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
  Approval references for ESP SLX Series: IECEx SIR 10.0030X, Sira 10ATEX2063X

Data Sheet


Use these protectors in hazardous environments where installation space is at a premium and large numbers of lines require protection (e.g. process control, 4-20 mA loops, fire and gas detectors and shut-down systems).

Suitable for high speed digital communication equipment or systems with long signal lines. See Furse Application Note AN013.


Connect in series with the data communication or signal line 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.



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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