ES-8156 Rev.8
MDJST
Lightning Surge Protectors for
Electronics Equipment M-RESTER
LIGHTNING SURGE PROTECTOR FOR
STANDARD SIGNAL LINE
(fast response: 3 nsec.)
Functions & Features
• Designed specifically for 4 – 20 mA DC and pulse signal line
• Battery-powered status indicator
• High discharge current capacity 20 kA (8/20 μs)
• Shield terminal provided
• Compatible with IEC 61643-21 categories C1, C2, D1.
MODEL: MDJST–[1][2]
ORDERING INFORMATION
• Code number: MDJST-[1][2]
Specify a code from below for each of [1] and [2].
(e.g. MDJST-24Y)
[1] NOMINAL VOLTAGE
12
: 12 V DC
24
: 24 V DC
48
: 48 V DC
[2] STATUS INDICATOR
A1
: Monitor LED
A2
: Monitor LED and alarm output
Y
: None
GENERAL SPECIFICATIONS
Construction
: Plug-in
Surge protection type
: Surge energy limiting type
Connection
: M3.5 screw terminals (torque 0.8 N·m)
Screw terminal
: Nickel-plated steel
Housing material
: Flame-resistant resin (black)
Status indicator
Monitor LED
: Green, activated by Check button
ON in normal operating
OFF in degradation of the voltage limiter or battery
discharged
Degradation judged
: When the leakage current at the voltage limiter exceeds approx. 50 μA. 1 V or more is necessary for the signal (line to line) voltage.
Check button
: Push button; momentary
Alarm output
: Open collector
28 V DC @ 100 mA (resistive load)
OFF in normal conditions
ON in degradation of the voltage limiter or
battery discharged
Saturation voltage 3.5 V DC
Battery
: Lithium-metal battery (model: ER3N4); Non-rechargeable and non-replaceable
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
: Surface or DIN rail; Standard Rack Mounting Frame BX-16H available
Weight
: 230 g (0.51 lb)
PERFORMANCE
Insulation resistance
: ≥ 100 MΩ with 250 V DC (Line to alarm output)
(The voltage more than 250 V DC turns the discharge element on; then the insulation between lines and alarm output will be lost)
Surge protection
: IEC 61643-21 Categories C1, C2, D1
EXTERNAL VIEW
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM