Optical fibre bushings



  • Fast, interference free transmission of data in both directions
  • Not affected by electromagnetic interference
  • High transmission reliability
  • High transmission speed
  • Corrosion-free contacts
  • Simple plug-in connection (low installation costs)
  • Reliable signal transmission even over long distances
  • Suitable for use under extreme conditions


Ex II 2G Ex d IIC Gb
Ex I M2 Ex d I Mb
Ex d IIC Gb
Ex d I Mb

Ambient temperature

Working temperature: -55 °C to +105 °C
depending on the fibre optic cable used (temperature ranges apply to the fixed installation of leads)
Ambient temperature limit switch:
-55 °C to +80 °C at T6
Depending on the fibre optic conductor selected, the enclosure heating at the installation site at the max. permissible ambient temperature must be assumed when calculating the max. temperature.


PTB 99 ATEX 1090 U
IECEx PTB 13.0030U
TC RU C-DE.GB06.B.00504


The optical fibre bushing is used as an optical fibre cable entry into flameproof enclosures located in hazardous areas. They can also be supplied with plug-in connectors.

The optical waveguiders – also known as fibres – are made of glass and resist to mechanical, climatic, chemical and electromagnetic influences. The optical waveguide is most commonly used for carrying signals in the form of electromagnetic waves in the frequency range of visible light.

The type and structure of the cable determines its transmission properties.

Technical data *

Installation Threaded entries for threaded bushings must conform to the minimum requirements of EN 60079-0, section 5.3. These optical fibre line bushings are suitable for installation in electrical flameproof enclosures devices of protection type “d“, groups IIA, IIB, IIC.
Energy Ex d II: max. 35 mW/ 5 mW/mm²
Ex d I: max. 150 mW/ 20 mW/mm²
Connection max. quantity of the fibre-optic cables: 47 cores
Sleeve size: metric M16 x 1.5 to M48 x 1.5
non-threaded: ∅ 22 mm to ∅ 40 mm
Sleeve material: Metal, bare, varnished or galvanised

*Refer to the documentation for more detailed information


Data Sheet - Optical fibre bushings

Customer requirements - Cable entries/line bushings

Operating Instructions - Optical Waveguides Type 57-91..-....