EM-8061 Rev.4 P. 1 / 4
INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR
THREE-WIRE SIGNAL LOOP
(ultra-slim)
MODEL
MD73W
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
■
SPECIFICATIONS
LINE TO LINE
LINE TO EARTH
Max. continuous
operating voltage (Uc)
±32V
±32V
Voltage protection level
(Up) @6kV (1.2 / 50 µs)
±60V
±60V
Leakage current @Uc
≤5µA
≤5µA
Response time
≤4 nsec.
≤20 nsec.
Max. discharge current
(Imax)
20kA (8 / 20 µs)
1.0kA (10 / 350 µs)
Nominal current (I
N
)
400mA
Internal series resistance
≤2.2Ω ±20% per line
POINTS OF CAUTION
■
ENVIRONMENT
•
Indoor use.
•
When heavy dust or metal particles are present in the
air, install the unit inside proper housing with sufficient
ventilation.
•
Do not install the unit where it is subjected to continuous
vibration. Do not subject the unit to physical impact.
•
Environmental temperature must be within -25 to +85°C
(-13 to +185°F) with relative humidity within 30 to 90%
RH in order to ensure adequate life span and operation.
•
This unit needs a DIN rail as earth grounding bar. Ox-
ide coating of an aluminium rail may lower the electric
conductivity between this module and the ground. Use a
steel or copper rail.
■
DIELECTRIC STRENGTH TESTING
•
The surge protector starts discharging when ±32V or
greater voltage is applied between lines and earth. Re-
move the grounding wire before conducting a test. Be
sure to return the wire after the test.
■
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 Lightning Surge Protector for Power
Lines for adequate protection.
COMPONENT IDENTIFICATION
Body
Spring Loader
DIN Rail Mounting
Adaptor (for grounding)
Connection
Diagram
(left side)
Model No.
Indication
056 222 38 18
www.sentronic.com
SENTRONIC
AG
