MTL Instruments FS32 Specifications

Technical data

MTL surge protection

MTL FS32 range

Surge protection for
fieldbus components

• Protects intrinsically safe spurs on

MTL 937x-FB range fieldbus

• 20kA maximum surge current per line

• Plug connectors for quick and easy

connection or rewiring

• Meets the requirements of IEC61158-2:2004

• Can be used on MTL Megablocks or

other fieldbus equipment

• 10 year product warranty

February 2016
EPS 901-169 Rev C

The FS32 surge protection device prevents surges and transient
over-voltages conducted along the Trunk or Spurs of fieldbus systems
from damaging the associated electronics such as terminators, spur
blocks and the bus control equipment. Designed to fit Eaton’s latest
MTL fieldbus barrier product to protect spurs the FS32 can also be
used to protect spurs on Megablock wiring hubs. This space saving
design helps to reduce the size of junction boxes and ease installation.

The multi-stage hybrid surge protection network at the heart of
the FS32 uses a combination of solid state electronics and a gas-filled
discharge tube (GDT) to provide surge protection up to 20k A. This
impressive surge protection circuit is design to exhibit exceptionally
low line resistance and has negligible voltage drop to the spurs.

In operation the FS32 does not adversely affect the performance
or operation of the fieldbus or connected equipment, it allows signals
to pass with little attenuation while diverting surge currents safely to
earth (ground) and clamping output voltages to safe levels.

Fully automatic in operation the FS32 devices react immediately
to make sure that the equipment is never exposed to damaging
surges between lines or the lines to earth (ground). Reacting
instantaneously the FS32 redirects surges safely to earth (ground)
and then resets automatically.

The FS32 represents the next generation of surge protection to be
fitted on F
allows the FS32 to be connected directly to the terminal receptacle on
the module carrier of the 9370 fieldbus barrier. The earth (ground) is
connected through the mounting screw in one simple operation. The
field spur cable termination block plugs directly into the FS32 allowing
fast and effective retro fitting if desired with no additional hardware
being required.

For general purpose Megablock wiring hubs FCS-MBx, FCS -MBx­SG, FCS-MBx-SG-T, F300 Range and Intrinsically Safe Megablock
wiring hubs F24 0 - F273 the FS 32 represents a simple solution for the
fitting of surge protection with the addition of the FS32- BAR earthing
(grounding) arrangement. Furthermore the FS32 can also be used on
fieldbus power supplies such as the F800 to protect the trunk.

A 10 year no fuss warranty is available as standard for the FS32, so
if a correctly connected device should fail for any reason simply return
it for a free replacement.

oundatio n™ fieldbus Systems. The space saving form factor

Measurement Technology Limited,
Great Marlings, Butterfield, Luton
Beds, LU2 8DL, UK.
Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283
E-mail: [e-mail]
www.mtl-inst.com

© 2016 MTL
All Rights Reserved
Publication No. EPS 901-169 Rev C 180216
February 2016

1

MTL FS32 range

February 2016

SPECIFICATION

All figures typical at 25°C (77°F) unless
otherwise stated

Maximum surge current

20k A (8/20µs waveform) per line

Leakage current

0.1µA @ working voltage

Working voltage

±32Vdc

Maximum continuous
operating voltage

±36V peak normal mode
±225 V peak common mode

Limiting voltage

62V @ 3kA 8/20µs

Line resistance

0.1 Ohm per line

Capacitance

Line — Line — 40pF
Line — Ear th (Ground) — 80pF

Attenuation

-1dB — 7kHz to 7.5MHz

Ambient temperature limits

-40°C to +75°C
(- 40°F to +167°F) (working)

-40°C to +80°C
(- 40°F to +176°F) (storage)

Humidity

5% to 95% RH (non-condensing)

Electrical connections

Plug/header screw terminal

Weight

40g

Dimensions

See figure 1

EMC compliance

BS EN 61326-1:2013

Electrical Safety

BS EN 61643-21:2001

INSTALLATION

Directly plugs into MTL 934x-FB and
Relcom mega-blocks.

ORDERING INFORMATION

FS32
FS32-BAR

Figure 1 Dimensions (as supplied)

Unprotected ve+

Unprotected ve-

Shield

Ground/Earth Screw

Figure 2 AC and DC connections

Protected ve+

Protected ve-

Shield

M3 threaded

hole, X8

M4 threaded hole, X8

Part No. FS32-BAR

Scored to break for
shorter applications

Ground bar for Megablocks

TO ORDER SPECIFY - Order by module, as listed in the specification table below.

Model FS32

Nominal voltage U
Rated voltage (MCOV) U
Nominal current I
Nominal discharge current (8/20µs) i
Max discharge current (8/20µs) I
Lightning impulse current (10/350µs) I
Residual voltage @ i
Voltage protection level @ 1kV/µs U
Bandwidth f
Capacitance C 40pF
Series resistance R 0.1
Operating temperature range -40°C to +75°C
Category tested A2, B2, C1, C2, C3, D1
Overstressed fault mode in=3kA 22kA
Impulse durability (8/20µs) 10kA
Degree of protection IP20
AC durability 1A
Service conditions 80kPa - 160kPa 5% - 95% RH

sn

U

n
c

n

sn
max
imp

p
p

G

32V
36V

1.6A
3kA
20kA

2.5kA
62V
<45V
73MHz

rms

, 5T

Tested in accordance to IEC 61643-21

HAZARDOUS AREA APPROVALS

Standard/Authority Certificate/File No. Approved for

ATEX Directive 94/9/EC
FISCO (Baseefa)

IECEx IECEx BAS 09.0083X Ex ia IIB T3 Ga

Test Specification No. 1, 2002
Marine (Lloyds Register)

2

Baseefa09ATEX0180X Ex ia IIB T3 Ga

14/60004 Environmental Category ENV3 FS32

Measurement Technology Limited,
Great Marlings, Butterfield, Luton
Beds, LU2 8DL, UK.
Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283
E-mail: [e-mail]
www.mtl-inst.com

© 2016 MTL
All Rights Reserved
Publication No. EPS 901-169 Rev C 180216
February 2016

Product

Ex ia IIC T4 Ga (-40°C<Ta<75°C) see schedule All

Ex ia IIC T4 Ga (-40°C<Ta<70°C) see schedule

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The given d ata is only intended as a p roduct
descrip tion and shou ld not be regarded as a le gal
warrant y of properties or gu arantee. In th e interest
of further technical developments, we reserve the
right to make de sign changes.

All