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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-8226  Rev.1  P. 1 / 3

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR

PHOTOVOLTAIC SYSTEM, INSTRUMENT SHELTER

MODEL

MDP-100T

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 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 for AC and specifically for DC power supplies 

up to 1A

• Beneficial for protecting instruments from counter elec-

tromotive force by inductors and of course normal light-
ning surges entering from power supply lines

• 1A fuse incorporated in element circuit

 

SPECIFICATIONS

LINE TO LINE LINE TO EARTH

Max. line voltage (Uc)

120V AC

170V DC

----

Discharge voltage

190V

410V

Voltage protection level (Up)

400V

800V

Leakage current

≤ 0.15mA

@150V DC

≤ 0.15mA

@300V DC

Response time

≤ 0.1 microseconds

Max. discharge current (Imax) 

1000A (8 / 20 µs)

Nominal current (IN)

1.0A

Internal series resistance

≤ 0.4 Ω including return

Dielectric strength of the 
base module

1500V AC @1 minute

(G terminal to other terminals)

POINTS OF CAUTION

 

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 power supply 

lines but also through signal lines.  We recommend that 
you also use the surge protectors for signal 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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