MTL Instruments MA30 Specifications

• 18kA surge protection and RFI

filtering

• Protects panel loads up to 30 Amps in

series, unlimited Amps in parallel

• Suitable for AC or DC applications

• Thermal and short circuit protection

• LED status indication feature and

remote alarm and power fail capability
with Form C contacts

• 10 year product warranty

technical datasheet

MA30 Series

AC and DC mains power surge protector and filter

The MA30 Series of surge protection
devices protects elect ronic equipmen t power

supplies and computer networks against the
effects of ‘noise pollution’ induced in AC
power supplies. MA30 units ‘clean up’ the
effects of industrial noise and surges caused
by lightning, switching devices, thyristor
controls, transmission system overloads and
power-factor correction circuits.

Industrial control systems and dc power
supplies utilizing programmable logic
controllers (plc) and industrial computers are
particularly vulnerable due to the aggressive
electrical environments for which they are
intended, such as process plants, factories
and water treatment sites. Although industrial
computers and plcs are designed to be
rugged, the extra protection provided by
the DIN rail mounting MA30 units is critical.
Ideally suited for protecting panel mounted
equipment and typically used in the controls
section of a motor control center (MCC),
the MA30 range provides surge and RFI
protected power.

With a unique ‘three-stage’ combination
of protection elements, these units suppress
conducted RFI and voltage surges. The
circuit elements are first, surge clipping
components to absorb transient surges that
may otherwise damage equipment; second
a filter to suppress noise in the system and
third, ‘ring’ suppression. The third of these
prevents surges causing the filter to ‘ring’
(oscillate) under low load conditions – an
effect that actually accentuates interference
in most commercially available filters.

Suitable for AC or DC application, MA30
units reduce both electromagnetic emissions
and the susceptibility of the associated
equipment to emissions from other sources.
MA30 devices also offer ultimate installation
flexibility. To protect circuits rated 30A or
less, MA30 devices should be installed in
series. To protect higher current circuits,
simply install the MA30 in parallel.

An LED status indication facility is
standard with the MA30 units. This displays
both ‘power on’ and that protection is present.
Thermal fusing is also incorporated into each
18kA rated device as an additional safety
feature. MA30 units also offer short circuit
protection. An optional remote monitoring
unit is also available with audio and visual
indication status, along with features such
as a test switch for checking the monitoring
circuitr y and an audio alarm silence switch.

MA30 devices exceed the requirements

of IEC 61000-4-5. Since MA30 units suppress
conducted RFI and voltage surges they
enable associated equipment to comply with
this aspect of ‘CE’ mark standards.

901-117 Rev I 170210

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

SPECIFICATION

All figures typical at 77°F (25°C) unless other wise st ated

Maximum surge current
18kA (8/20µs) per mode

Maximum leakage current

<0.3mA

Maximum continuous operating current

30A series connection
Unlimited Amps in parallel

Working voltage

AC DC
MA30/D/1/SI 120V, 47-63Hz 140V
MA30/D/1TT 120V, 47-63Hz 140V
MA30/D/2/SI 240V, 47-63Hz 280V
MA30/D/2TT 240V, 47-63Hz 280V
MA30/D/3/SI 240V, 47-63Hz 280V

Maximum continuous operating voltage

25% above nominal

Limiting voltage
@ 500A ring

120V/140V versions 295V
240V/280V versions 404V
@ 500A 8/20µs
120V/140V versions 320V
240V/280V versions 628V
@ 3kA 8/20µs
120V/140V versions 396V
240V/280V versions 820V
@ 10kA 8/20µs
120V/140V versions 585V
240V/280V versions 1020V

Maximum attenuation (typical)

-55dB @ 100MHz

Modes protected

Single phase: L-N, L-E, N-E
Split phase: L-E, L-L

Ambient temperature limits

–40°F to +185°F (working)
–40°C to +85°C (working)

Humidity

95% RH (non-condensing)

Casing

ABS with DIN-rail mounting foot
Connectors
Screw terminal

Terminals

#10 AWG (5.3mm2)

Mounting

1.4 inch (35mm) DIN rail
Indication
Green LED on Protection present
Green LED off Internal failure

Weight

3.53oz (100g)

Dimensions

See figure 1

EMC compliance

BS EN 60950 : 1992
BS EN 61000-6-2 : 1999

INSTALLATION

The grounding (earthing) of the surge protector and
the protected equipment is very important and, if
possible, should be accomplished as illustrated.
The unit is marked Protected and Unprotected and
it is important that the unit is installed with the
Unprotected side connected to the incoming AC power
and the Protected side connected to the equipment
to be protected. For parallel application however, the
Unprotected side is connected to the incoming AC
power and the Protected side left unconnected.

Model 500A

Ring

(V)

500A

8/20µs

(V)

3kA 8/20

8/20µs

(V)

10kA

8/20µs

MA30/D/1/SI 295 320 396 585

MA30/D/1TT 295 320 396 585

MA30/D/2/SI 404 628 820 1020

MA30/D/2TT 404 628 820 1020

MA30/D/3/SI 404 628 820 1020

Figure 1 Dimensions

Figure 2 Installation

Remote Monitoring Unit

(Model number 11101)
Indication
Green LED on Protection present
Red LED on Fault indication
Audible alarm Fault indication
Connectors
Screw terminal
Terminals
14 AWG (2mm2)
Weight
1 lb (450g)
Dimensions

5.5” x 4” x 1.5” (135mm x 100mm x 40mm)

(V)

The give n data is o nly inte nded as a p roduc t descr iption a nd shou ld not be r egard ed as a leg al war ranty o f prope rtie s
or guarantee. In the interest of further technical developments, we reserve the right to make design changes.

EUROPE (EM EA): +44 ( 0)1582 723633 THE AMER ICAS: [phone] ASIA-PACIF IC: [phone]

[e-mail] [e-mail] [e-mail] 901-117 Rev I 170210