Eaton 9373-FB3 MTL Fieldbus Barrier Assembly, 12 spur, Stainless Steel enclosures

• 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, modular construction

• Ergonomic mechanical design

• Pluggable system components,

without ‘gas free’ constraints

• Optional, integrated surge protection

for trunk and spurs

• Optional, integrated Isolation Switch for Trunk

The 9373-FB3 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

FOUNDATIONTM fieldbus H1 communications via a non

intrinsically safe trunk and converts this to a number of

galvanically isolated, intrinsically safe, spur connections.

The trunk terminals are implemented as increased safety

(Ex e) and the spur terminals as intrinsically safe (Ex ia) for

connection to IS fieldbus instruments in IIC, Zone 0 hazardous

areas.  The spur connections are compatible with both FISCO

and Entity-certified field instruments.

The fieldbus barrier is mounted in a 316L stainless steel,

increased safety, Ex e enclosure that segregates spur and

trunk cabling in accordance with hazardous area certification.

Inside the enclosure, the incoming trunk wiring terminates

in a separate compartment containing increased safety (Ex

e) trunk wiring terminals. This compartment has a protective

cover to deter interference, and carries a warning to the user

not to work on trunk wiring without first isolating the power.

A fieldbus terminator is included for the trunk wiring to ensure

correct termination of the wiring and prevent unwanted

reflections and signal disturbances.

The system described in this manual provides 12 spurs of

“simplex” type - meaning they are not intended to provide

redundancy between spurs. Each spur is short circuit

protected, so that other devices continue to operate in the

presence of field wiring faults.

Surge protection can be added on individual outgoing spurs by

the use of individual Spur Surge protection modules (part no.

FS32). Similarly, trunk surge suppression (part no. FS32-XE)  is

available to protect the fieldbus barrier against damaging voltage

and current surges on the incoming trunk wiring.

The stainless steel enclosure may be installed in a

Zone 1. Zone 2. Zone 21 or Zone 22 hazardous area; in which

case, the trunk wiring must be implemented using suitably

protected cable. It provides excellent chemical and moisture

resistance and is suitable for use in a wide range of corrosive

environments.

The 9373-FB3 fieldbus barrier enclosure is

bus-powered and requires no additional power supply in the

field. When used with a fieldbus host control system, power

for the trunk MUST be provided only by a supply conforming to

IEC 61158-2. e.g. MTL F800 or MTL 918x range of redundant

power supplies.

The enclosure is supplied pre–drilled for all trunk and

spur cable entries and internal trunking provides adequate

separation between the trunk and spur cables. It is also fitted

with Ex eb tb certified blanking plugs and a breather.