M-system MD7ST, Instruction Manual

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EM-8057 Rev.4 P. 1 / 4
INSTRUCTION MANUAL
LIGHTNING SURGE PROTECTOR FOR
STANDARD SIGNAL LINE
(ultra-slim)
MODEL
MD7ST
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
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SPECIFICATIONS
See Table 1.
Table 1. Specifications
MODEL NO. NOMINAL VOLTAGE MD7ST-24 MD7ST-60
SHLD TERMINAL FF FG GF GG FF FG GF GG
Max. continuous
operating voltage
(Uc) Line to Line 30V 70V
Line to Earth ±160V 30V ±160V 70V
Line to SHLD ±160V 30V ±160V 70V
SHLD to Earth ±160V short ±160V short ±160V short ±160V short
Voltage protection
level (Up)
@4kV (1.2 / 50 µs) Line to Line 60V 115V
Line to Earth ±800V ±60V ±800V ±115V
Line to SHLD ±1200V ±800V ±60V ±1200V ±800V ±115V
SHLD to Earth ±800V short ±800V short ±800V short ±800V short
Leakage current
@Uc Line to Line ≤5µA ≤5µA
Other sections ≤5µA ≤5µA
Response time Line to Line ≤4 nsec. ≤4 nsec.
Other sections ≤20 nsec. ≤20 nsec.
Max. discharge current (Imax) 20kA (8 / 20 µs), 1.0kA (10 / 350 µs)
Nominal current (I
N
) 250mA
Internal series
resistance Without fuse 4.7Ω ±10% per line 10Ω ±10% per line
With fuse 7.5Ω ±10% per line 12.5Ω ±10% per line
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AG