LIGHTNING SURGE PROTECTOR FOR
STANDARD SIGNAL LINE & PULSE USE (life monitor)
MODEL
MDPA-24
MDPA-65
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 (Head element + Base) ........................... (1)
DIN rail mounting adaptor*.............................................. (1)
Screws for DIN rail mounting (M4 × 8)* .......................... (2)
*Included with option code /A33
(Base section is optional.)
■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.
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
• Designed specifically for 4 – 20mA DC and pulse signal
line including both 4-wire and 2-wire transmitters
• Life monitor function helps you to decide when you
should replace the surge protector; reduces maintenance
and prevents downtime
• Pressing CHK (Check) button confirms the degradation
and life span of the surge protection circuits with LEDs
• Absorbs surges only without affecting instrumentation signal
• No interruption of signal by unplugging surge protector element
■SPECIFICATIONS
LINE TO LINE LINE TO
EARTH
MDPA-24 MDPA-65
Max. continuous
operating voltage (Uc)
30V 70V ±160V
Voltage protection level
(Up) @1kV (100A)
45V 85V ±650V
Voltage protection level
(Up) @2kV (1kA)
50V 100V ±650V
Leakage current
(new device)
≤ 5µA
@30V DC
≤ 5µA
@70V DC
≤ 5µA
@±140V DC
Capacitance @1 MHz ≤ 1000 pF ≤ 1000 pF ≤ 100 pF
Response time ≤ 4 nsec. ≤ 4 nsec. ≤ 20 nsec.
Max. line voltage 30V 70V ----
Max. discharge current (Imax)
5000A (8 / 20 µs)
Nominal current (IN) 100mA
Internal series resistance
20 Ω ±10% including return
POINTS OF CAUTION
■ENVIRONMENT
• Indoor use.
• When heavy dust or metal particles are present in the
air, install the surge protector inside proper housing with
sufficient ventilation.
• Do not install the surge protector where it is subjected to
continuous vibration. Do not subject the unit to physical
impact.
• Environmental temperature must be within -5 to +55°C
(23 to 131°F) with relative humidity within 30 to 85% RH
in order to ensure adequate life span and operation.
■WIRING
• Do not install cables close to noise sources (relay drive
cable, high frequency line, etc.).
• Do not bind the surge protector’s cables together with
those in which noises are present. Do not install them in
the same duct.
■DIELECTRIC STRENGTH TEST
• Loosen the screw located at the left-center of the element
and remove the element module from the base before
conducting a dielectric strength testing. Otherwise the
element will start discharging at a voltage exceeding the
max. continuous operating voltage (Uc), which can cause
insulation failure of the module.
Be sure to return the element and fasten securely after
the test.
■BATTERY LIFE
• The battery’s life is assured for 10 years from the manu-
facturing date indicated at the right-top of the specifica-
tion label (when used ≤ 2 minutes/month).
• The battery continues to discharge even while it is un-
used. We recommend not to store the Element module for
a long period of time.
■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 surge protectors for power line for suffi-
cient protection.
