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EM-8054  Rev.3  P. 1 / 4

INSTRUCTION MANUAL

LIGHTNING SURGE PROTECTOR FOR

RTD USE

 (ultra-slim)

MODEL

MD7RB

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

• 

Does not affect instrumentation signal when combined
with a 3-wire RTD, thanks to the internal high accuracy
series resistors

 

SPECIFICATIONS

See Table 1.

Table 1. Specifications

MODEL NO.

MD7RB-FF

MD7RB-FG

MD7RB-GF

MD7RB-GG

Max. continuous operating voltage (Uc)

Line to Line

±3V

Line to Earth

±160V

±7.5V

Line to SHLD

±160V

±7.5V

SHLD to Earth

±160V

short

±160V

short

Voltage protection level (Up)

Line to Line

±25V

@4kV (1.2 / 50 µs)

Line to Earth

±800V

±25V

Line to SHLD

±1200V

±800V

±25V

SHLD to Earth

±800V

short

±800V

short

Leakage current @Uc

Line to Line

≤5µA

Other sections

≤5µA

Response time

Line to Line

≤4 nsec.

Other sections

≤20 nsec.

Max. discharge current (Imax)

20kA (8 / 20 µs), 1.0kA (10 / 350 µs)

Nominal current (I

N

)

100mA

Internal series resistance

5.12Ω ±0.3%, ±30 ppm/°C per line

056 222 38 18

[email protected]

www.sentronic.com

SENTRONIC

AG

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