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EM-8063  Rev.3  P. 1 / 4

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR

STRAIN GAUGE

 (ultra-slim)

MODEL

MD7LC

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)

 

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.
When using this product in potentially explosive atmos-
phere or hazardous (classified) location, you have to follow
the safety procedure to install it.  Please refer to “SAFE IN-
STALLATION MANUAL” for each type of certification.

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

• 

High discharge current capacity 20 kA (8 / 20 µs), 1 kA
(10 / 350 µs)

• 

Ultra-thin 7-mm-wide module can be mounted in high
density

• 

Excellent protection employing multi-stage SPD circuits

• 

DIN rail mounting and grounding

• 

Shield terminal provided

• 

Protects strain gauges and transmitters

 

SPECIFICATIONS

See Table 1.

Table 1. Specifications

MODEL NO.

MD7LC-0

MD7LC-1

Max. continuous operating voltage (Uc)

Output voltage

±0.2V

Excitation

  15V

Line to Earth*

1

±15V

Voltage protection level (Up)

Output voltage

±15V @0.2kV (1.2 / 50 µs)

±40V @6kV (1.2 / 50 µs)

Excitation

  30V @0.2kV (1.2 / 50 µs)

  50V @6kV (1.2 / 50 µs)

Line to Earth*

1

±30V @0.2kV (1.2 / 50 µs)

±50V @6kV (1.2 / 50 µs)

Leakage current @Uc

Output voltage

≤0.2µA

Excitation

≤2µA

Line to Earth*

1

≤2µA

Response time

≤4 nsec.

Max. discharge current (Imax)

100A (8 / 20 µs)

20kA (8 / 20 µs), 1kA (10 / 350 µs)

Nominal current (I

N

)

----

250mA

Internal series resistance

----

1.5Ω ±10% per line

*1. Measured across the terminal 2 and DIN rail, the terminal 7 and DIN rail.

056 222 38 18

[email protected]

www.sentronic.com

SENTRONIC

AG

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