MTL Instruments IOP Specifications

Technical data

MTL surge protection

MTL IOP range

Cost effective surge protection
for digital and analogue I/O

• IOP32D and IOP-AC each provide surge

protection for two loops or 4 wires

• IOP32 provides surge protection for one loop

or 2 wires

• IOP HC32 provides surge protection for one

high current loop, up to 5A

• IOP-AC provides surge protections for two

120V or 240V AC loops

• Hybrid protection circuit - 20kA rated

surge current

• ATEX & FM certification for IOP32 and IOP32D

• Space saving - width per loop:

IOP32D & IOP-AC 6mm
IOP32 & IOP HC32 12mm

July 2015
EPS 901-123 Rev P

The IOP was conceived to offer protection for both digital I/O and
analogue I/O. The IOP range is the most economical surge protection

solution for I/O offered by Eaton. High packing-density, high protection
level and low price combine to make the IOP a value solution.

The IOP range is cost-effective and still retains a hybrid circuit
comprising 20kA gas discharge tubes and solid state components.
This impressive product is designed to exhibit exceptionally low line
resistance and therefore adds only a tiny voltage drop to the circuit.

Removable terminals are used on the IOP range for ease of
installation, maintenance and for providing a loop disconnect by simply
unplugging the terminals from the side of the module. Wire entry is
angled to assist wiring within limited space enclosures.

The IOP HC32 is ideal for applications requiring up to 5A of
load current. Protection of circuits to drive solenoids, relays, and

actuators is now possible. The IOP AC is ideal for 120V and 240V
AC circuit loops

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

The versatile design minimizes space. The IOP32D and IOP-AC
models have protection for two loops in a package that is only
12mm wide. The effective space taken, per loop, is therefore only
6mm. For customers desiring single channel integrity, the IOP32 fits
this need exactly.

One simple manual operation clamps modules securely onto DIN
rail, which automatically provides the essential high-integrity ground
connection.

A 10 Year ‘No Fuss’ warranty is available, as standard, for the IOP, so
if a correctly connected device should fail for any reason, simply return
it for a free replacement.

‘Top-hat’ (T-section) DIN rail is generally suitable for mounting IOP
modules although for adverse environments, a specially-plated version
is available from Eaton’s MTL Surge Technologies.

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

© 2015 MTL
All Rights Reserved
Publication No. EPS 901-123 Rev P
July 2015

1

MTL IOP range

July 2015

SPECIFICATION

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

Maximum surge current
20kA (8/20µs waveform) per line

Leakage Current

<1µA @ working voltage

Maximum rated load current

0.675A (5A for IOP HC32)

Loop resistance

IOP32 & IOP32D: 4 ohm
IOP- AC: 1 ohm
IOP HC32: 0 ohm

Bandwidth

6.5 MHz (N/A for IOP HC32)

Attenuation

< –0.3dB @ < 1MHz
–3.0dB @ 6.5MHz

Response time

<1ns

Ambient temperature

Working & Storage

-40°C to +80°C (-40°F to +176°F)
(see also “Approvals” below)

Humidity

5 to 95% RH (non-condensing)

Terminals

2.5mm

Electrical connections

Plug/ header screw terminal strip

Mounting

T-section DIN-rail (35 x 15mm rail)

Weight

140g approx. (5oz.)

Case flammability

UL94-V0

EMC compliance

BS EN 61326-1:20 06

Electrical Safety

BS EN 60950-1:2006+A12:2011
BS EN 61010-1:2010

2

(12 AWG)

Figure 3

Figure 1 Dimensions

Installation

Figure 2 Connection details

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

Model IOP32 IOP32D IOP HC32 IOP-AC

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
Series resistance R 2Ω 2Ω 0Ω 0.5Ω
Category tested A2, B2, C1, C2, C3, D1
Overstressed fault mode in=3kA 22kA 22kA 22kA 22kA
Impulse durability (8/20µs) 10kA 10kA 10kA 10kA
Degree of protection IP20
AC durability 1Arms, 5T N/A
Service conditions 80kPa - 160kPa 5% - 95% RH

Tested in accordance with IEC 61643-21.

sn

sn

max

imp
U

n

c

n

p

p

G

32V 32V 32V 240V

36V 36V 36V 275V

675mA 675mA 5A 1.75A

3kA 3kA 3kA 3kA

20kA 20kA 20kA 20kA

2.5kA 2.5kA 2.5kA 2.5kA

45V L-L
78V L-G

<38V <38V <38V 500V

6.5MHz 6.5MHz N/A N/A

45V L-L
90V L-G

65VL-L

(250V

sparkover)

65V L-G

800V L-L
800V L-G

HAZARDOUS AREA APPROVALS

Country

(Authority)

Europe
(Bassefa)

Europe
(Bassefa)

EU (MTL)

USA (FM) Class 3600 (1998), Class 3610 (2010),

Canada (FM) C22.2 No. 213, 142, 94, 157, 30

IEC 60079-0:2011
EN 60079-11:2012

IEC 60079-0:2011
EN 60079-11:2012

EN 60079-14:2009
EN 60069-15:2010

Class 3611 (1999), Class 3615 (1989),
Class 3810 incl. Supp 1 (1995-07 (1989-03),

ANSI/NEMA 250 (1991),
ANSI/ISA 60079-0 (2009),
ANSI/ISA 60079-11 (2009), ISA-S12.0.01
(1999)

ANSI/NEMA 250
CAN/CSA-E79-0, CAN/CSA-E79-11

2

Standard

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

© 2015 MTL
All Rights Reserved
Publication No. EPS 901-123 Rev P
July 2015

Certificate/

File No.

Baseefa12ATEX0066X Ex ia IIC T4 Ga IOP32D

Baseefa06ATEX0036X Ex ia IIC T4 Ga IOP32

MTL03ATEX0755X Ex n IIC T4 Ga

3011208 IS/I/1/A-D, I/0/AEx ia IIC,

3025374C IS/I/1/A-D, I/0/AEx ia IIC,

EUROPE (EMEA):

[phone]
[e-mail]

THE AMERICAS:

[phone]
[e-mail]

ASIA-PACIFIC:

[phone]
[e-mail]

Approved for Product

I/0/AEx ia IIB, NI/I/2/A-D
NI/I/2/IIC

I/0/AEx ia IIB, NI/I/2/A-D
NI/I/2/IIC

The given d ata is only intended as a p roduct
descrip tion and should not be re garded as a legal
warrant y of properties or gu arantee. In the interest
of further technical developments, we reserve the
right to make de sign changes.

IOP32D
IOP32D

IOP32
IOP32D

IOP32
IOP32D