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EM-8283-A Rev.3

P. 1 / 6

MD6x-24
MD6x-65

BEFORE USE ....

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

■ 

PACKAGE INCLUDES:

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

■ 

MODEL NO.

Check that model No. described on the specification label is
exactly what you ordered.

■ 

INSTALLATION / INSTRUCTION MANUAL

This manual describes necessary points of caution when you
use this product, including installation and basic mainte-
nance procedure.
When using this product in potentially explosive atmosphere
or hazardous (classified) location, you have to follow the
safety procedure to install it.  Please refer to “SAFE INSTAL-
LATION MANUAL” for each type of certification.

LIMITATION APPLICABLE TO M-RESTER

The M-Rester will protect electronics equipment from dam-
age caused by lightning by absorbing most of the surge
voltages.

However, M-Rester may not be effective against certain
extremely high voltages caused by a direct or almost direct
hit by lightning.

M-Rester must be installed according to this installation /
instruction manual.

INSTRUCTION  MANUAL

MODEL

LIGHTNING SURGE PROTECTOR FOR STANDARD

SIGNAL LINE & PULSE USE 

(conduit mount, weather-proof)

MD6x-24
MD6x-65

GENERAL

■ 

FUNCTION & FEATURES

• Designed specifically to protect 4 to 20mA DC and pulse
signal line including both 4-wire and 2-wire transmitters
• Direct mount in a wiring conduit of outdoor enclosures
• Absorbs surges only without affecting transmitted signals

■ 

SPECIFICATIONS

BETWEEN LINES

LINE TO GND

MD6x-24

MD6x-65

Discharge voltage 30V min.

70V min.

±

160V min.

(peak voltage)

Max. surge voltage* 40V max.

100V max.

±

650V max.

Leakage current

5

µ

A

5

µ

A

5

µ

A

@30V DC

@70V DC

@

±

160V DC

Max. line voltage

30V DC

70V DC

–––

Response time

4 nsec.

4 nsec.

20 nsec.

Capacitance

2500 pF

2500 pF

100 pF

@1kHz

@1kHz

@1kHz

Discharge current

10000A (8 / 20 

µ

sec.)

Max. load current

100mA

Internal series resist.

approx. 22

 including return

*The maximum voltage that could pass through M-RESTER.
Protected equipment must be able to withstand this voltage
for a very short time period.

POINTS OF CAUTION

■ 

GENERAL PRECAUTION

• Before you remove the unit or mount it, turn off the signal
input and the power supply to the connected devices for
safety.

■ 

ENVIRONMENT

• Do not install the M-RESTER where it is subjected to
continuous vibration.  Do not apply physical impact to the M-
RESTER.
• Environmental temperature must be within -40 to +85

°

C

(-40 to +185

°

F) in order to ensure adequate life span and

operation.

■ 

INSULATION RESISTANCE TEST

• Before conducting an insulation test, remove the unit from
the protected signal line.  Use a megger of 125V DC at the
maximum.  If you use a higher-rated megger, the discharge
elements will start discharging, which will be detected falsely
as insulation failure.

■ 

AND ....

• We recommend that you keep spare M-RESTERs so that
you can replace them when necessary.

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