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

MD7AST

Lightning Surge Protectors for
Electronics Equipment M-RESTER

LIGHTNING SURGE PROTECTOR FOR
STANDARD SIGNAL LINE
(ultra-slim; life monitor)

Functions & 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
• Life monitor function helps you to decide when you should replace the surge protector; reduces maintenance and prevents downtime
• Incorporated battery
• Pressing CHK (Check) button confirms with
LEDs the degradation and life span of the surge protection circuits
 

MODEL: MD7AST–[1][2][3]

ORDERING INFORMATION
• Code number: MD7AST-[1][2][3]
Specify a code from below for each [1] through [3].
  (e.g. MD7AST-24FF/Q)
• Specify the specification for option code /Q
  (e.g. /C01)

[1] NOMINAL VOLTAGE
24: 24 V DC
60: 60 V DC

[2] SHIELD TERMINAL (line / earth)
FF: Floating / Floating
FG: Floating / Grounding

[3] OPTIONS
blank: none
/Q: With options (specify the specification)

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

GENERAL SPECIFICATIONS
Construction: Slim-sized front terminal structure
Degree of protection: IP20
Connection: Euro terminal block (torque 0.3 N·m)
Applicable wire size: 0.2 – 2.5 mm2,  stripped length 8 mm
Grounding: DIN Rail
Housing material: Flame-resistant resin (black)
Indicators: Activated by CHK (Check) button
  BAT: Green LED
  ALM: Red LED
Degradation judged: When the leakage current at the voltage limiter exceeds approx. 7.5 μA.
Life time judged: When the count of the discharge element discharging reaches the expected life span.
CHK button: Push button; momentary
Battery: Lithium; No recharge or replacement available.
Battery life: 10 years (when used ≤ 2 minutes/month)

INSTALLATION
Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: DIN Rail (TH35-7.5, 1-mm-thick)
Oxide film on the surface of an aluminium DIN rail may lower the electric conductivity between this module and the ground. Use a steel or copper rail.
Weight: 70 g (2.5 oz)

PERFORMANCE

STANDARDS & APPROVALS
EU conformity:
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
RoHS Directive
  EN 50581

EXTERNAL VIEW

CONNECTION EXAMPLES

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm (inch)

SCHEMATIC CIRCUITRY

M-System Co., Ltd.