·Some details are not shown. Please refer to specification sheets for all information.

MDP-MFA

Lightning Surge Protectors for
Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR TELEMETERING USE
(50 bps)

Functions & Features
• Designed specifically to protect telemetering systems utilizing leased communication lines
• Applicable for M-System’s Telemetering Unit Model DLS with modem model A1
• Absorbs surges only without affecting instrumentation signal
• No interruption of transmission signal by unplugging the protector element

MODEL: MDP–MFA[1]

ORDERING INFORMATION
• Code number: MDP-MFA[1]
 Specify a code from below for [1].
 (e.g. MDP-MFA/A33/Q)
• Specify the specification for option code /Q
 (e.g. /C01)

[1] OPTIONS (multiple selections)
DIN Rail Mounting Adapter
blank: Without
/A33: With adapter (model A-33)
Other Options
blank: none
/Q: Option other than the above (specify the specification)

SPECIFICATIONS OF OPTION: Q
COATING (For the detail, refer to M-System's web site.)
/C01: Silicone coating
/C02: Polyurethane coating
/C03: Rubber coating

RELATED PRODUCTS
• 50 bps modem (model: MOD)
• 50 bps modem (model: MOD1)

GENERAL SPECIFICATIONS
Construction: Plug-in
Connection: M4 screw terminals (torque 0.8 N·m)
Screw terminal: Nickel-plated steel
Housing material: Flame-resistant resin (black)

INSTALLATION
Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 140 g (0.31 lb), standard
165 g (0.36 lb), with DIN rail mounting adapter

PERFORMANCE
Max. continuous operating voltage (Uc): 
 B to C: ±110 V 
 B or C to A: ±55 V
 Line to earth: ±140 V
Voltage protection level (Up):
• @ 1 kV (100 A)
 2 to 3: ±320 V 
 2 or 3 to 1: ±160 V
 Line to earth: ±650 V
• @ 2 kV (1 kA) 
 2 to 3: ±320 V 
 2 or 3 to 1: ±200 V
 Line to earth: ±800 V max.
Response time: ≤ 0.1 μsec.
Leakage current:
 B to C: ≤ 50 μA @ ±110 V DC
 B or C to A: ≤ 50 μA @ ±55 V DC
 Line to earth: ≤ 10 μA @ ±140 V DC
Max. discharge current (Imax): 5000 A (8 / 20 μs)
Nominal current (IN): 100 mA
Internal series resistance: 20 Ω ±10 % (including return)
Capacitance @ 1 MHz:
 Line to line:  ≤ 1000 pF
 Line to earth: ≤ 100 pF
Surge protection: IEC 61643-21 Categories C1, C2, D1

CONNECTION EXAMPLES

GROUNDING

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm (inch)

MOUNTING REQUIREMENTS unit: mm (inch)

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

M-System Co., Ltd.