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5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201  Fax: +81(6)6659-8510  E-mail: [email protected]

EM-8223  Rev.1  P. 1 / 3

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR 

PHOTOVOLTAIC SYSTEM, INSTRUMENT SHELTER

MODEL

MDP-65T

BEFORE USE ....

Thank you for choosing M-System.  Before use, please check 
contents of the package you received as outlined below.
If you have any problems or questions with the product, 
please contact M-System’s Sales Office or representatives.

 

PACKAGE INCLUDES:

Surge protector ....................................................................(1)
DIN rail mounting adaptor* ...............................................(1)
Screws for DIN rail mounting (M4 × 8)* ...........................(2)
*Included with option code /A33

 

MODEL NO.

Confirm Model No. marking on the product to be exactly 
what you ordered.

 

INSTRUCTION MANUAL

This manual describes necessary points of caution when 
you use this product, including installation, connection and 
basic maintenance procedures.

LIMITATION APPLICABLE TO M-RESTER

The M-RESTER will protect electronics equipment from 
damage caused by lightning by absorbing most of the 
surge voltages.
However, M-RESTER may not be effective against cer-
tain extremely high voltages caused by a direct or almost 
direct hit by lightning.
M-RESTER must be installed according to this installa-
tion / instruction manual.

GENERAL

 

FUNCTION & FEATURES

• Designed specifically for 4 – 20mA DC and pulse signal 

line including both 4-wire and 2-wire transmitters

• Absorbs surges only without affecting instrumentation 

signal

• No interruption of signal by unplugging surge protector 

element

 

SPECIFICATIONS

LINE TO LINE

LINE TO EARTH

Max. continuous oper-
ating voltage (Uc)

70V

±140V

Voltage protection level
(Up) @1kV (100A)

80V

±650V

Voltage protection level
(Up) @2kV (1kA)

110V

±800V

Leakage current

≤ 30µA

@70V DC

≤ 5µA

@±140V DC

Capacitance @1 MHz

≤ 1000 pF

≤ 100 pF 

Response time

≤ 4 nsec.

≤ 20 nsec.

Max. discharge current (Imax) 

5000A (8 / 20 µs)

Nominal current (I

N

)

100mA

Internal series resistance

20 Ω ±10% including return

POINTS OF CAUTION

 

CONFORMITY WITH EU DIRECTIVES

• The actual installation environments such as panel con-

figurations, connected devices, connected wires, may af-
fect the protection level of this unit when it is integrated 
in a panel system.  The user may have to review the CE 
requirements in regard to the whole system and employ 
additional protective measures to ensure the CE conform-
ity.

• Continuous operating voltage must be less than 75V. 

 

ENVIRONMENT

• When heavy dust or metal particles are present in the 

air, install the surge protector inside proper housing with 
sufficient ventilation.

• Do not install the surge protector where it is subjected to 

continuous vibration.  Do not subject the unit to physical 
impact.

• Environmental temperature must be within -20 to +80°C     

(-4 to 176°F) with relative humidity within 30 to 90% RH 
in order to ensure adequate life span and operation.

 

DIELECTRIC STRENGTH TEST

• Loosen the screw located at the left-center of the element 

and remove the element module from the base before 
conducting a dielectric strength testing.  Otherwise the 
element will start discharging at a voltage exceeding the 
max. continuous operating voltage (Uc), which can cause 
insulation failure of the module.

   Be sure to return the element and fasten securely after 

the test.

 

AND ....

• We recommend that you keep spare surge protectors so 

that you can replace them when necessary.

• Lightning surge can enter not only through signal lines 

but also through power supply lines.  We recommend that 
you also use the surge protectors for power line for suf-
ficient protection.

COMPONENT IDENTIFICATION

M•RESTER

Ground Terminal (G)
(used as mounting bracket)

Head Element

Base

Specifications

Head Element is secured to Base 
with screw when the surge protector 
is shipped from Factory.

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