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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-8139  Rev.4  P. 1 / 4

INSTRUCTION MANUAL

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)
LAN cable ............................................................................(1)
Single mount DIN rail ........................................................(1)
(Only for option code ‘/DR’ selected)

 

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.

POINTS OF CAUTION

 

ENVIRONMENT

• Indoor use.
• 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 -25 to +85°C 

(-13 to +185°F) with relative humidity within 30 to 90% 
RH in order to ensure adequate life span and operation.

• This unit can be earthed via a DIN rail.  Oxide film on the 

surface of an aluminum rail may lower the electric con-
ductivity between this module and the ground.  When this 
unit is earthed via a DIN rail, use a steel or copper rail.

• Steel rails may be coated with thin oxide film.  Discharg-

ing surge current may produce sparks with the film.  
However, this does not affect the surge protection.  If you 
need to avoid sparks, prior to mounting on the DIN rail, 
remove the film by a wire brush.

• Single mount DIN rail for option code ‘/DR’ is made of alu-

minum.  Connect to ground with ground terminal when 
this DIN rail is used.

 

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

MODULAR JACK,

SURGE SIDE

Body

Specifications

SHORTCIRCUIT BAR

MODULAR JACK,

PROTECTED SIDE

DIN rail adaptor

SHIELD TERMINAL

EARTH TERMINAL

Side (hidden)

INSTALLATION

Mount the unit on a DIN rail.  Once installed, do not move 
it to another DIN rail.

 

MOUNTING THE UNIT ON A DIN RAIL

A) Hang the upper hook of the DIN rail mounting adaptor at 

the rear side of unit, on the DIN rail.

B) Push in the lower in keeping pressing the unit to the DIN 

rail.

DIN Rail

B

A

 

REMOVING THE UNIT

A) Pull down the DIN rail adaptor utilizing a minus screw-

driver.

B) Pull out the lower part of the unit.
C) Detach the upper part from the DIN rail.

C

B

A

DIN rail adaptor

LIGHTNING SURGE PROTECTOR FOR ETHERNET 

(PoE / 10 BASE-T / 100 BASE-TX / 1000 BASE-T)

MODEL

MDCAT

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