MTL Instruments MA4000 Specifications

• AC or DC application

• Straightforward and simple

installation — wall mounting

• Remote monitoring plus dual

redundancy

• ATEX Category 3G certified

• 10 year product warranty

technical datasheet

MA4000 Series

Surge protection for AC and DC power supplies in harsh environments

MA4000 Series surge protection devices
prevent surges and transient overvoltages
conducted through power circuits from
damaging electronic systems such as control
panels, distributed I/O, motor and pump
controls and many other remotely mounted
pieces of equipment.

The MA4000 Series is available in a range
of voltage options (24Vdc, 48Vdc, 110Vac

and 230Vac) making it universally suitable
for protecting power supplies in hostile
environments. These 20kA rated, single phase
devices provide protection for ac or dc power
supplies with no restriction to the amount of load
current.

Fully automatic in operation, MA4000
devices react immediately, clamping voltage
surges without causing undue leakage
losses under normal conditions. No operator
intervention is required, MA4000 devices reset
automatically and are maintenance free. The
MA4000 is designed to protect and survive the
level of transient associated with the industrial
environment, extending the life of equipment

which could otherwise be stressed or damaged
if not properly protected.

Connected in parallel via flying leads,
MA4000 devices are easily connected to
the power supply. The robust, IP54 (NEMA 13)
rated enclosure is simply ‘wall mounted’ via the
four fixing points provided.

Remote monitoring is provided, as standard,
which can be utilised to provide indication
of the status of an MA4000 unit. These wires
have a normally closed contact which will
open to indicate that reduced protection is
present. However, continuity of protection is
ensured via the redundancy capability of the
MA4000 range. Additionally, thermal fusing,
incorporated into each MA4000 unit, ensures
a high level of safety.

The MA4000 Series is self-certified to ATEX
94/9/EC for mounting into Zone 2, Category
3G hazardous areas, especially useful for
protecting the next generation of Hazardous
Area mounted control systems. Also, the
MA4000’s aluminium case is silica filled, a

requirement of Ex q certification. The MA4000
also has a 10 year product warranty.

901-105 Rev E 170210

www.mtl-inst.com [e-mail]

Specification

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

Maximum surge current

20kA

Leakage current

0.3mA

Lines protected AC

L-N, L-E, N-E

Lines protected DC

V+, V

Ambient temperature limits

–30°C to +60°C (working)
–22°F to +140°F (working)

Humidity

95% RH (non-condensing)

Enclosure

IP54 (NEMA 13)

Connections

AC Live, Neutral, Earth remote monitor 1 & 2
DC +ve, -ve, Earth remote monitor 1 & 2
Wire size: 5 x 2.5mm2 (12 AWG)
Lead length: 450mm (1.5 ft)

Mounting

Surface mount with 4 x 6mm (0.24”) slots

Remote contacts

NC 250Vac, 2A rated

Weight

1Kg (2.2lb)

Dimensions

See figure 1

ATEX compliance

BS EN 50014 : 1998
BS EN 50021 : 1999
IEC 60079-0 : 1998
IEC 60079-15 : 2001

EMC compliance

BS EN 61643-1
BS EN 61000-6-2 : 2001,
referencing particularly ­IEC 61000-4-2 : 2000
IEC 61000-4-4 : 2001
IEC 61000-4-5 : 2000

Model Working

voltage

Limiting
voltage*

(6kV/3 kA)

Maximum

continuous

operating

Line

frequency

Phase types

voltage

(V) (V) (V)

AC versions

MA4020-110 110 Vac 470 130 dc to 60Hz Single phase 2 wire

MA4020-230 230Vac 790 265 dc to 60Hz Single phase 2 wire

DC versions

MA4020-024 24Vdc 210 38 dc 2 wire
MA4020-048 48Vdc 240 65 dc 2 wire

* 8/20μs waveform (cable length 150mm)

Figure 1 Dimensions

inStallation

MA4000 Series devices can be easily
mounted using the four fixing points provided
on the enclosure. Flying leads are provided
for easy connection to the power supply
cable (see figure 2 for further information).

The MA4000 device should be mounted close
to the equipment it is protecting and should
be bonded directly to the equipment with as
short a length of cable as possible.

ordering information

AC versions

MA4020-F-110-1-D-R (110Vac version)
MA4020-F-230-1-D-R (230Vac version)

DC versions

MA4020-F-024-1-D-R (24Vdc version)
MA4020-F-048-1-D-R (48Vdc version)

EUROPE (EM EA): [phone] THE AMER ICAS: [phone] ASIA-PACIF IC: [phone]

[e-mail] [e-mail] [e-mail] 901-105 Rev E 170210

Figure 2 AC and DC connections

approvalS

Standard/Authority Certific No. Approved for Product

ATEX Directive 94/9/for
Zone 2 Category 3G

ECTML02ATEX4020X Ex n A II T4 (-30°C<Tamb<+60°C) MA4020-024

EEx n A II T4 (-30°C<Tamb<+60°C) MA4020-048

MA4020-110

MA4020-230

The given data is only in tended as a product des cription and should not b e regarded as a legal warranty o f properties
or guarantee. I n the interest of fu rther tech nical develop ments, we reserve th e right to make design c hanges.