background image

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-8155  Rev.2  P. 1 / 4

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR 

POWER SUPPLY USE (fast response: 3 nsec.)

MODEL

MMAJ

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:

Lightning surge protector ...................................................(1)

 

MODEL NO.

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

 

INSTALLATION / 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.  Install the surge protector on a place where 

the monitor LED can be easily visible.

• It is possible to be hit by a certain strong lightning ex-

ceeding the capacity of this unit.  The surge protector may 
will be destroyed by such high lightning energy.  Be sure 
to install the surge protector inside a metal enclosure for 
safety.

• 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 -5 to +55°C 

(23 to 131°F) and with relative humidity within 30 to 90% 
RH in order to ensure adequate life span and operation.

• Do not perform the installation, wiring or checking the 

M-RESTER during thunder storms.

 

DIELECTRIC STRENGTH TEST

• Disconnect the earth conductor before conducting a di-

electric strength test.  If the test is performed, connecting 
to the earth, the surge protector will start discharging at 
the described discharge voltage, resulting as insulation 
failure.  Be sure to connect the earth conductor after the 
testing is complete.

 

RATED CURRENT

• Be sure that the rated current of protected device does 

not exceed the maximum load current specification of the 
M-RESTER.

• Be sure to install a breaker which matches the current 

rating at the power source side of the M-RESTER.

 

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

U

V

u

v

PE

Monitor

ALM

A2

A1

C

Surge
Side

Protect

Side

Body

Specifications

Monitor LED

Surge Side 

Terminals

Earth Terminals

Protect Side 

Terminals

Alarm Terminals

*

1. Only for “alarm output” option

*

1

 

FRONT VIEW

U

V

u

v

PE

Monitor

ALM

A2
A1

C

Surge

Side

Protect

Side

Reviews: