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
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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
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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
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