Eaton MTL

MTL Instruments Group

Products

Intrinsically Safe Fieldbus Barriers

The 9373-FB3-Px-SS is a third-generation product, in a successful range of Eaton Fieldbus Barrier Systems. The field-mounted enclosure contains a barrier that receives power and Foundation™ fieldbus H1 communications via a non-intrinsically safe trunk and converts this to a number of galvanically isolated, intrinsically safe, spur connections.

FB3 barrier

Key features:

  • For Foundation™ fieldbus networks in hazardous areas
  • Complete enclosure systems for 12 intrinsically safe spur connections
  • Mount in Zone 1 (gas) or 21 (dust) with spurs connected into Zone 0
  • Compatible with FISCO and Entity-certified fieldbus instruments
  • Compact version with reduced footprint
  • Ergonomic mechanical design
  • Optional, integrated surge protection for trunk and spurs

The 937x-FB2 Fieldbus Barrier Series are field-mounted wiring hubs that creates six or twelve intrinsically safe spur connections from a high-energy trunk, for connection to suitably certified Foundation™ fieldbus H1 instruments. Capable of supporting heavily loaded fieldbus segments and long trunk cable lengths, the Fieldbus Barrier may be installed in Zone 1 (gas) or Zone 21 (dust) hazardous areas, with the trunk wiring implemented using suitably protected cable and increased safety (Ex e) connection facilities.

FB2 barrier

Key features:

  • For Foundation™ fieldbus networks in hazardous areas
  • Complete enclosure system for 6 or 12 intrinsically safe spur connections
  • Mount in Zone 1 (gas) or 21 (dust) with spurs connected into Zone 0
  • Compatible with FISCO and Entity-certified fieldbus instruments
  • Compact, modular construction
  • Ergonomic mechanical design
  • Pluggable system components, without ‘gas free’ constraints
  • Optional, integrated surge protection for trunk and spurs

The 9372-FB Redundant Fieldbus Barriers are field-mounted wiring hubs that create up to six intrinsically safe spur connections from a high-energy trunk, for connection to suitably certified Foundation™ fieldbus H1 instruments. They may be installed in Zone 1 (gas) or Zone 21 (dust) hazardous areas, with the trunk wiring implemented using suitably protected cable and increased safety (Ex e) connection facilities.

FB2 planview

Key features:

  • For Foundation™ fieldbus networks in hazardous areas
  • Redundant configuration for super-high system availability
  • Complete enclosure systems for up to 6 intrinsically safe spur connections
  • Failure alarm direct to host control system via integrated fieldbus device
  • Mount in Zone 1 (gas) or 21 (dust) with spurs connected into Zone 0
  • Compatible with FISCO and Entity certified fieldbus instruments
  • Ergonomic mechanical design
  • Pluggable system components, without ‘gas free’ constraints
  • Optional, integrated surge protection for trunk and spurs

9376-SP trunk surge protector


The 9376-SP Trunk Surge Protector prevents surges and transient over-voltages induced on the trunk of the fieldbus network from damaging the system’s internal components such as the Fieldbus Barrier Module and terminator. Like the 9378-FT, it can also be removed and replaced while powered in a Zone 1 hazardous area.
FS32 surge protector
For maximum protection, the FS32 Surge Protection Device prevents surges and transient over-voltages conducted along the Spurs of fieldbus systems from damaging the fieldbus barrier module.

Fieldbus barrier without enclosure The Fieldbus Barrier internal system components are also available as ‘Open Frame’ versions, for installation into user-selected field enclosures. These are suitable for applications requiring special enclosure features such as viewing window or removable gland plate, or where multiple Fieldbus Barrier segments are required in a single enclosure. 6-spur (9387-FBx) and 12-spur (9388-FBx) versions are supported. Each unit comprises pre-wired and assembled modular components on a stainless steel baseplate, for installation into an Ex e certified field enclosure without the need for additional internal wiring or ancillary components. Connection facilities are provided for the trunk and spur wiring, as well as all electronic modules needed to support a fully-working Fieldbus Barrier.

For product certificates

The MTL 9371/3/4-FB-Px-xx Fieldbus Barrier range is not RoHS compliant, hence will only be supplied for spares & repairs within the EU from July 2017.

Product Code Description Downloads

intrinsically safe logo Symbol denotes that the equipment is suitable for use in hazardous area applications.
fsm logo Symbol denotes that the product has been assessed for functional safety applications

1. Simplex, 12 way MTL Compact Fieldbus Barrier
9373-FB3-Px-SS   Fieldbus Barrier module, 12 spur SS enclosure Datasheet 
9377-FB3-Px   Fieldbus Barrier module, 12 spur Datasheet 
2. Redundant version, Open Frame– for installation into 3rd party enclosure
9387-FB-xx-R   Redundant Fieldbus Barrier baseplate, 5-spur Datasheet  Manual 
3. Redundant versions, Glass Reinforced Polyester and Stainless Steel enclosures
9372-FB-Px-xx   Redundant Fieldbus Barrier system, 5 spur Datasheet  Manual 
4. Simplex versions, Stainless Steel (SS) enclosure
937x-FB2-Px-SS   Fieldbus Barrier system, 6 and 12 spur, SS enclosure Datasheet  Drawings  Manual 
5. Simplex versions, Glass Reinforced Polyester (GRP) enclosure
937x-FB2-Px-PP   Fieldbus Barrier system, 6 and 12 spur, GRP enclosure Datasheet  Drawings  Manual 
6. Accessories
9376-SP   Trunk Surge Protector Datasheet  Manual 
9378-FT   Fieldbus Terminator (for use with –FB enclosure versions only) Datasheet 
F93-XE   Fieldbus Barrier Terminator Datasheet 
FS32   Spur Surge Protector Datasheet 
7. 937x-FB Classic Fieldbus Barriers - use for spares
9377-FB-R   Fieldbus Barrier Module Manual 
937x-FB-Px-SS   Fieldbus Barrier system, 6 and 12 spur, SS enclosure (pre Version 2) Manual 
937x-FB-Px-SS   Fieldbus Barrier system, 6 and 12 spur, SS enclosure Datasheet  Manual 
938x-FB-Px-xx   Fieldbus Barrier baseplate, 6 and 12 spur, Open Frame – for installation into 3rd party enclosure Datasheet  Manual 
8. Simplex versions, Open Frame – for installation into 3rd party enclosure
938x-FB2-Px-xx   Fieldbus Barrier baseplate, 6 and 12 spur Datasheet 
9. 937x-FB Classic Fieldbus Barriers - use for spares
937x-FB-Px-PP   Fieldbus Barrier system, 6 and 12 spur, GRP enclosure Datasheet  Manual 

Product Termination Notice - Last Time Buy

Statement issued

28th June 2019

Replacements and notes

12th March 2019

937x-FB2 range

9371-FB-xx-SS

6-spur FB Barrier enclosure system

9373-FB-xx-SS

12-spur FB Barrier enclosure system

9374-FB-xx-SS

12-spur FB Barrier system (one module fitted)

9371-FB-xx-PP

6-spur FB Barrier enclosure system

9373-FB-xx-PP

12-spur FB Barrier enclosure system

9374-FB-xx-PP

12-spur FB Barrier system (one module fitted)

9387-FB-xx

6-spur Fieldbus Barrier system (Open-frame)

9388-FB-xx

12-spur Fieldbus Barrier system (Open-frame)